Superluminescent Diode (SLD) Light Sources for OCT Systems

SLDs Optimized for Use in OCT Systems
Center Wavelength from 810 nm to 1325 nm
Fiber-Coupled Power: ≥6 mW
SM or PM Fiber Pigtail with FC/APC Connector

SLD1325

1325 nm SLD, >100 nm Bandwidth

An Image of the Anterior of the Eye Taken with the SLD830S-A10 in a Modified Ganymede ll OCT System

SLD830S-A10

830 nm SLD, Gain Ripple: ≤0.15 dB

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Overview
Specs
Resolution SD-OCT
Pin Diagram
Feedback

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The SLD1325 Superluminescent Diode Mounted in a CLD1015 Compact Laser Diode Driver with TEC

Quick Links
810 nm (SM)
830 nm (SM)
850 nm (SM)
880 nm (SM)
930 nm (SM or PM)
970 nm (SM or PM)
1050 nm (SM or PM)
1310 nm (SM)
1325 nm (SM)

Features

SLDs Optimized for Use in Spectral Domain OCT Systems
810, 830, 850, 880, 930, 970, 1050, or 1325 nm Center Wavelength
FC/APC-Terminated Fiber Pigtail Minimizes Optical Feedback
Integrated TEC and Thermistor for Temperature Control
Hermetically Sealed 14-Pin Butterfly Package

Superluminescent Diodes (SLDs) are the light source of choice in Spectral Domain Optical Coherence Tomography (SD-OCT) imaging. The broad spectrum and short coherence length of the emitted light improves the depth resolution in OCT images. Thorlabs offers SLDs designed for OCT applications with center wavelengths of 810, 830, 850, 880, 930, 970, 1050, or 1325 nm. Each SLD is shipped with an individualized product data sheet, which includes information on the spectrum and operating parameters of the device. Raw test data for each SLD is also available upon request; please contact Tech Support with inquiries. For more details about each SLD, please see the Specs tab.

These devices are built into 14-pin butterfly packages, each with an integrated thermoelectric cooler (TEC) and thermistor to ensure output stability. The output is coupled into either an SM or PM fiber terminated with a 2.0 mm narrow key FC/APC connector. Please note that optical feedback can diminish the output power or damage the SLD. We do not recommend using these SLDs with components that are prone to back reflections, such as FC/PC connectors. The SLD1325 1325 nm superluminescent diode incorporates an integrated isolator. If you are interested in an SLD at a different wavelength with an integrated isolator, please contact Tech Support with inquiries.

Thorlabs is able to provide low-ripple SLDs with custom wavelengths or higher power diodes. Please note that the engineering design and wafer manufacturing costs involved make the purchase of low quantities very costly. For a quote on custom SLDs, please contact Tech Support.

The SLDs featured on this page have either a near-Gaussian or flat-top optical spectrum. The calculation for the center wavelength differs with these two spectral shapes. Please see the Specs tab for center wavelength calculations.

For wavelengths up to 1550 nm and devices not optimized for OCT, see our full selection of superluminescent diodes.

Operation Guidelines
We strongly recommend adherence to the operating conditions marked on each package. While optimal performance is achieved by utilizing the recommended settings, we recognize users can adjust the spectral characteristics of the SLD by deviating from these recommended settings. For instance, operating at lower temperatures will cause a shift of the central wavelength to shorter wavelengths. It is imperative, however, that as the temperature is reduced, the injection current is also reduced so as not to exceed the recommended output power if one is noted on the data sheet that is included with the SLD.

These SLDs should be operated at a constant current and temperature, which is relatively simple with the proper SLD mount and drivers. To mount and drive these SLDs, Thorlabs recommends using a ITC4000 Series Laser Diode Driver with the LM14S2 Mount.

As with most active semiconductor devices, standard anti-static handling procedures must be adhered to in order to prevent an electrical discharge that could destroy the device.

OCT Application Images

Click to Enlarge

Click to Enlarge

Images of (a) the lens, (b) the anterior, and (c) the retina of the eye obtained using a Ganymede SD-OCT System modified to integrate an SLD830S-A10 (sold below) as a light source. The images each have an in-tissue depth of 6.2 mm and were taken using a 36 kHz A-scan rate.

Due to the nature of producing superluminescent diodes with ultra wide bandwidths, some of the SLDs sold below have spectral shapes that are near gaussian, while others have a shape with a flattened top. This difference in spectral shape demands two different methods of defining center wavelength in order to provide an accurate description of the diode.

Near-Guassian Center Wavelength Definition
The center wavelength for devices with a near-gaussian spectral shape is defined by an average weighted by the relative amplitude and may not correspond to peak power or the FWHM center wavelength due to the variability of the spectrum shape. For a given Optical Spectrum Analyzer (OSA) trace:

Weighted Average

where

CW is the Specified Center Wavelength
X_i is the Wavelength of a Trace Data Point
Y_i is the Amplitude of a Trace Data Point

Flat-Top Center Wavelength Definition
The center wavelength for devices with a flat-top spectral shape is defined by the midpoint between the two wavelengths located at 3 dB below the maximum intensity point on the spectrum. For a given OSA trace:

Weighted Average

where

CW is the Specified Center Wavelength
X_{R_3dB} is the Right Wavelength Edge of the 3 dB Bandwidth
X_{L_3dB} is the Left Wavelength Edge of the 3 dB Bandwidth

SLD Specifications

Note that these specifications are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note: the ASE Power specification is the output from the fiber pigtail.

810 nm Superluminescent Diodes

Item #	SLD810S
Parameter^a	Min	Typical	Max
Center Wavelength^b	795 nm	810 nm	825 nm
Spectral Shape	Near Gaussian
Operating Current	-	-	270 mA
ASE Power^c	13 mW	15 mW	-
Optical 3 dB Bandwidth^c,d	25 nm	30 nm	-
RMS Gain Ripple^c,e	-	0.03 dB	0.15 dB
Forward Voltage	-	2.1 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.2 A	1.4 A
TEC Voltage	-	0.3 V	6.0 V
Thermister Resistance	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^c,e
Absolute Maximum Ratings^a
Absolute Max Current	290 mA
Operating Case Temperature	0 to 70 °C
Storage Temperature	-10 to 70 °C
Pin Code	14 Pin, Type 1
Fiber Specifications
Fiber Type	780HP
Numerical Aperture	0.13
Core Diameter	4.4 µm
Mode Field Diameter (Nominal)	5.0 ± 0.5 µm @ 850 nm
Fiber Length	1.5 m
Connector	FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
The center wavelength for an SLD with a near-Gaussian spectral shape is defined by an average weighted by relative amplitude and may not correspond to the peak power or FWHM center wavelength. See the definitions above for details.
At Operating Current
At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Measurement Resolution = 0.02 nm

830 nm Superluminescent Diodes

Item #	SLD830S-A10W			SLD830S-A20W			SLD830S-A10			SLD830S-A20
Parameter^a	Min	Typical	Max	Min	Typical	Max	Min	Typical	Max	Min	Typical	Max
Center Wavelength^b	815 nm	830 nm	845 nm	815 nm	830 nm	845 nm	820 nm	830 nm	840 nm	820 nm	830 nm	840 nm
Spectral Shape	Flat Top			Flat Top			Near Gaussian			Near Gaussian
Operating Current	-	-	240 mA	-	-	330 mA	-	-	150 mA	-	-	240 mA
ASE Power^c,d	10 mW	-	-	20 mW	-	-	10 mW	13 mW	-	20 mW	22 mW	-
Optical 3 dB Bandwidth^c,e	50 nm	60 nm	-	40 nm	55 nm	-	17 nm	20 nm	-	17 nm	20 nm	-
Optical 20 dB Bandwidth^c	-	-	-	-	-	-	-	50 nm	-	-	50 nm	-
RMS Gain Ripple^c,f	-	0.06 dB	0.3 dB	-	0.03 dB	0.3 dB	-	0.03 dB	0.15 dB	-	0.03 dB	0.15 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.14 A	1.4 A	-	0.14 A	1.4 A	-	0.1 A	1.5 A	-	0.1 A	1.5 A
TEC Voltage	-	0.18 V	6.0 V	-	0.18 V	6.0 V	-	0.13 V	4.0 V	-	0.13 V	4.0 V
Thermistor Resistance	-	10 kΩ	-	-	10 kΩ	-	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^f
Absolute Maximum Ratings^a
Absolute Max Current	240 mA			330 mA			150 mA			240 mA
Operating Case Temperature	0 to 70 °C
Storage Temperature	-10 to 70°C
Pin Code	14 Pin, Type 1
Fiber Specifications
Fiber Type	780HP
Numerical Aperture	0.13
Core Diameter	4.4 µm
Mode Field Diameter (Nominal)	5.0 ± 0.5 µm @ 850 nm
Fiber Length	1.5 m
Connector	FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
The center wavelength for an SLD with a flat-top spectral shape is defined as the midpoint of the 3 dB bandwidth; for an SLD with a near-gaussian spectral shape, the center wavelength is defined by an average weighted by relative amplitude and may not correspond to the peak power or FWHM center wavelength. See the definitions above for details.
At Operating Current
Corresponds to the output of the fiber pigtail.
For SLD830S-A10W and SLD830S-A20W: At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Measurement Resolution = 0.02 nm

850 nm Superluminescent Diodes

Item #	SLD850S-A10W			SLD850S-A20W
Parameter^a	Min	Typical	Max	Min	Typical	Max
Center Wavelength^b	835 nm	850 nm	865 nm	835 nm	850 nm	865 nm
Spectral Shape	Flat Top			Flat Top
Operating Current	-	-	180 mA	-	-	340 mA
ASE Power^c,d	10 mW	-	-	20 mW	-	-
Optical 3 dB Bandwidth^c,d	40 nm	60 nm	-	40 nm	55 nm	-
RMS Gain Ripple^c,e	-	0.03 dB	0.3 dB	-	0.03 dB	0.3 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.11 A	1.4 A	-	0.18 A	1.4 A
TEC Voltage	-	0.17 V	6.0 V	-	0.27 V	6.0 V
Thermistor Resistance	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e
Absolute Maximum Ratings^a
Absolute Max Current	180 mA			340 mA
Operating Case Temperature	0 to 70 °C
Storage Temperature	-10 to 70°C
Pin Code	14 Pin, Type 1
Fiber Specifications
Fiber Type	780HP
Numerical Aperture	0.13
Core Diameter	4.4 µm
Mode Field Diameter (Nominal)	5.0 ± 0.5 µm @ 850 nm
Fiber Length	1.5 m
Connector	FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
Specification given at operating current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm

880 nm Superluminescent Diodes

Item #	SLD880S-A7			SLD880S-A25
Parameter^a	Min	Typical	Max	Min	Typical	Max
Center Wavelength^b	860 nm	880 nm	900 nm	860 nm	880 nm	900 nm
Spectral Shape	Flat Top			Flat Top
Operating Current	-	-	225 mA	-	-	410 mA
ASE Power^c,d	6 mW	7 mW	-	23 mW	25 mW	-
Optical 3 dB Bandwidth^c	35 nm	40 nm	-	35 nm	40 nm	-
Optical 20 dB Bandwidth^c	-	80 nm	-	-	80 nm	-
RMS Gain Ripple^c,e	-	0.06 dB	0.3 dB	-	0.06 dB	0.3 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.2 A	1.4 A	-	0.2 A	1.4 A
TEC Voltage	-	0.8 V	6.0 V	-	0.8 V	6.0 V
Thermistor Resistance	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e
Absolute Maximum Ratings^a
Absolute Max Current	225 mA			410 mA
Operating Case Temperature	0 to 70 °C
Storage Temperature	-10 to 70°C
Pin Code	14 Pin, Type 1
Fiber Specifications
Fiber Type	780HP
Numerical Aperture	0.13
Core Diameter	4.4 µm
Mode Field Diameter (Nominal)	5.0 ± 0.5 µm @ 850 nm
Fiber Length	1.0 m
Connector	FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
Specification given at operating current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm

930 nm Superluminescent Diodes

Item #	SLD930S-A40W			SLD930P-A40W
Parameter^a	Min	Typical	Max	Min	Typical	Max
Operating Current	-	-	800 mA	-	-	800 mA
Center Wavelength^b	915 nm	930 nm	945 nm	915 nm	930 nm	945 nm
Spectral Shape	Flat Top			Flat Top
ASE Power^c,d	36 mW	40 mW	-	36 mW	40 mW	-
Optical 3 dB Bandwidth^c,d	40 nm	45 nm	-	40 nm	45 nm	-
RMS Gain Ripple^c,e	-	0.06 dB	0.3 dB	-	0.06 dB	0.3 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.54 A	1.4 A	-	0.54 A	1.4 A
TEC Voltage	-	0.78 V	6.0 V	-	0.78 V	6.0 V
Thermistor Resistance^d	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e
Absolute Maximum Ratings^a
Absolute Max Current	800 mA			800 mA
Operating Case Temperature	0 °C to 70 °C			0 °C to 70 °C
Storage Temperature	-10 °C to 70 °C			-10 °C to 70 °C
Pin Code	14 Pin, Type 1			14 Pin, Type 1
Fiber Specifications
Fiber Type	780HP			PM780-HP^f
Numerical Aperture	0.13			0.12
Core Diameter	4.4 µm			4.5 µm
Mode Field Diameter (Nominal)	5.0 ± 0.5 µm @ 850 nm			5.3 ± 1.0 µm @ 850 nm
Fiber Length	1.5 m			1.5 m
Connector	FC/APC, 2.0 mm Narrow Key			FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
Specification given at operating current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Slow axis aligned to connector key.

970 nm Superluminescent Diodes

Item #	SLD970S-A40W			SLD970P-A40W
Parameter^a	Min	Typical	Max	Min	Typical	Max
Operating Current	-	1000 mA	1010 mA	-	1000 mA	1010 mA
Center Wavelength^b	945 nm	970 nm	995 nm	945 nm	970 nm	995 nm
Spectral Shape	Flat Top			Flat Top
ASE Power^c,d	35 mW	40 mW	-	35 mW	40 mW	-
Optical 3 dB Bandwidth^c,d	40 nm	50 nm	-	40 nm	50 nm	-
RMS Gain Ripple^c,e	-	0.03 dB	0.2 dB	-	0.03 dB	0.2 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 70 °C
TEC Current	-	0.83 A	1.4 A	-	0.83 A	1.4 A
TEC Voltage	-	1.2 V	6.0 V	-	1.2 V	6.0 V
Thermistor Resistance^d	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e
Absolute Maximum Ratings^a
Absolute Max Current	1010 mA			1010 mA
Operating Case Temperature	0 °C to 70 °C			0 °C to 70 °C
Storage Temperature	-10 °C to 70 °C			-10 °C to 70 °C
Pin Code	14 Pin, Type 1			14 Pin, Type 1
Fiber Specifications
Fiber Type	HI1060			PM980-XP^f
Numerical Aperture	0.14			0.12
Core Diameter	5.8 µm			5.5 µm
Mode Field Diameter (Nominal)	5.9 ± 0.3 µm @ 980 nm			6.6 ± 0.5 µm @ 980 nm
Fiber Length	1.5 m			1.5 m
Connector	FC/APC, 2.0 mm Narrow Key			FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
Specification given at operating current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Slow axis aligned to connector key.

1050 nm Superluminescent Diodes

Item #	SLD1050S-A60^a			SLD1050P-A60^a
Parameter^a	Min	Typical	Max	Min	Typical	Max
Center Wavelength^b	1025 nm	1050 nm	1075 nm	1025 nm	1050 nm	1075 nm
Spectral Shape	Flat Top			Flat Top
Operating Current	-	-	1010 mA	-	-	1010 mA
ASE Power^c,d	55 mW	60 mW	-	55 mW	60 mW	-
Optical 3 dB Bandwidth^c	60 nm	70 nm	-	60 nm	70 nm	-
Optical 20 dB Bandwidth^c	-	100 nm	-	-	-	-
RMS Gain Ripple^c,e	-	0.03 dB	0.2 dB	-	0.06 dB	0.2 dB
Forward Voltage^c	-	2.0 V	2.5 V	-	2.0 V	2.5 V
TEC Operation: Typ. / Max @ T_CASE = 25 °C / 65 °C
TEC Current	-	0.7 A	2.5 A	-	0.7 A	2.5 A
TEC Voltage	-	0.9 V	3.2 V	-	0.9 V	3.2 V
Thermistor Resistance	-	10 kΩ	-	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e
Absolute Maximum Ratings^a
Absolute Max Current	1010 mA			1010 mA
Operating Case Temperature	0 to 70 °C			0 to 70 °C
Storage Temperature	-10 to 70°C			-10 to 70°C
Pin Code	14 Pin, Type 1			14 Pin, Type 1
Fiber Specifications
Fiber Type	HI1060			PM980-XP^f
Numerical Aperture	0.14			0.12
Core Diameter	6.2 µm			5.5 µm
Mode Field Diameter (Nominal)	6.2 ± 0.3 µm @ 1060 nm			6.6 ± 0.5 µm @ 980 nm
Fiber Length	1.5 m			1.5 m
Connector	FC/APC, 2.0 mm Narrow Key			FC/APC, 2.0 mm Narrow Key

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
At Operating Current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Slow axis aligned to connector key.

1310 nm Superluminescent Diode

Item #	SLD1021S
Parameter^a	Min	Typical	Max
Operating Current	-	700 mA	900 mA
Center Wavelength^b	1290 nm	-	1330 nm
Spectral Shape	Near Gaussian
ASE Power^c,d	10 mW	12.5 mW	-
Optical 3 dB Bandwidth^c	80 nm	85 nm	-
RMS Gain Ripple^c,e	-	-	0.35 dB
Forward Voltage	-	1.55 V	2.0 V
Fiber Type	SMF-28e+
Operating Temperature Range	0 to 40 °C
TEC Operation
TEC Current	-	0.4 A	1.5 A
TEC Voltage	-	0.5 V	4 V
Thermistor Resistance^d	-	10 kΩ	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
The center wavelength is defined by an average weighted by relative amplitude and may not correspond to the peak power or FWHM center wavelength. See the definitions above for details.
At Operating Current
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.1 nm

1325 nm Superluminescent Diode

Item #	SLD1325
Parameter^a	Min	Typical	Max
Operating Current	-	-	780 mA
Center Wavelength^b	-	1325 nm	-
Spectral Shape	Flat Top
ASE Power^c	10 mW	-	-
Optical 3 dB Bandwidth	100 nm	-	-
RMS Gain Ripple	-	-	-
Forward Voltage	-	-	4 V
Fiber Type	SMF-28e
Operating Temperature Range	0 to 40 °C
TEC Operation
TEC Current	-	-	4 A
TEC Voltage	-	-	4 V
Thermistor Resistance^d	-	-	10 kΩ
Integrated Isolator
Isolation	30 dB	-	-
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot

These Operating Specifications are a consistent set of values which will yield the specified performance. Please note that exceeding the Absolute Maximum Ratings in the table may cause device failure.
Defined as the midpoint of the 3 dB bandwidth. See the definitions above for details.
Corresponds to the output of the fiber pigtail at the operating current.
Steinhart - Hart Coefficients: C₁ = 1.1291x10^-3,
C₂ = 2.3413x10^-4, and C₃ = 0.8767x10^-7

Theoretical Limit of Axial Resolution for a 1325 nm SD OCT system

Theoretical axial resolution for a Spectral Domain OCT System utilizing a 1325 nm light source with 100 nm bandwidth in air, assuming an ideal source with Gaussian spectral distribution.

The theoretical axial (depth) resolution of a Spectral Domain OCT imaging system is

Here, Δz, is the axial resolution (FWHM of the autocorrelation function) while Δλ is the FWHM of the power spectrum of the SLD light source. The index of refraction (n) of air is ~1, so for a central wavelength (λ) of 1325 nm and a spectral bandwidth of 100 nm, the theoretical axial resolution would be approximately 7.7 µm (see plot). This equation assumes an ideal source with Gaussian spectral distribution. To reduce side-lobe artifacts that may arise from utilizing non-Gaussian sources, we recommend applying a spectral filter to the detected interferogram. Depending on the filter applied, the actual resolution may be reduced.

Butterfly Package, Type 1

Pin	Description	Pin	Description
1	+ TEC	14	- TEC
2	Thermistor	13	Case Ground
3	NC	12	NC
4	NC	11	SLD Cathode
5	Thermistor	10	SLD Anode
6	NC	9	NC
7	NC	8	NC

Posted Comments:

Jang Jin (posted 2020-07-21 22:29:26.41)

I am writing to inquire about SLD1050S-A60 life time. I look forward to hearing from you in my inquiry soon. Thank you.

YLohia (posted 2020-07-23 04:58:31.0)

Thank you for contacting Thorlabs. We expect the lifetime of the SLD1050S-A60 to be >100,000 hours at 60 mW/950 mA/25 C operating parameters.

Murat Yessenov (posted 2020-05-27 20:07:04.087)

Hi! I wonder if you can make a custom-made SLD at a slightly different wavelength. We are interested in an SLD similar to SLD830S-A20, but centered at or closer to 800 nm? Thanks!

YLohia (posted 2020-05-28 09:37:32.0)

Hello, thank you for contacting Thorlabs. Is there any specific reason that the SLD830S-A20W does not work for your application? This is a broadband SLED and will cover a wide region of wavelengths around 800 nm. I have reached out to you directly to discuss this further.

robert (posted 2017-08-22 09:01:35.56)

Dear, I have one question regarding SLD unit in OCT instruments for example Topcon OCT-2000. Has a SLD unit lifitime and how we can count this lifetime ? Is this is depending only from how many OCT images has been done or also how many years are old SLD unit. IS life time is also depending of working hours of SLD for example we have switch on OCT 8 hours every day and we done maybe 20 OCT images. Thanks a lot for your help. Regards, Robert Rimc

tfrisch (posted 2017-09-13 11:22:29.0)

Hello, thank you for contacting Thorlabs. Lifetime can be estimated, but it will vary for different operating conditions. I will reach out to you directly to discuss your application.

jjurado (posted 2011-07-12 10:31:00.0)

Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. You are correct in asserting that the theoretical resolution is based on the assumption of a Gaussian profile. There are analytical filtering techniques which can be performed to reshape the spectrum of the SLD1325 to provide a Gaussian shape. The actual resolution will sacrifice a bit, but in practice it is nominal. We will add information to the resolution tab shortly to clarify this. Please do not hesitate to contact us at techsupport@thorlabs.com if you have any further questions or comments.

user (posted 2011-07-11 10:41:04.0)

The theoretical resolution is based on a gaussian shape. The equation is not valid for this light source, but you suggest it would.

Tyler (posted 2009-02-13 08:11:21.0)

A response from Tyler at Thorlabs to xzhao: Thank you for pointing out the units mistake. It has been fixed.

xzhao (posted 2009-02-13 00:30:17.0)

Dear Webmaster, The Spec for SLD1325 should be Bandwidth* >100 nm but not Bandwidth* >100 mW Thanks, Xuefeng Zhao Thorlabs Japan

810 nm Superluminescent Diode for OCT

Zoom

Item #^a	SLD810S
Parameter	Min	Typ.	Max
Operating Current	-	-	270 mA
Center Wavelength^b	795 nm	810 nm	825 nm
Spectral Shape	Near Gaussian
ASE Power^c,d	13 mW	15 mW	-
Optical 3 dB Bandwidth^c	25 nm	30 nm	-
RMS Gain Ripple^c,e	-	0.03 dB	0.15 dB
Fiber Type	780HP
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e

Full specifications are available by clicking on the Specs tab above.
The center wavelength for an SLD with a near-gaussian spectral shape is defined by an average weighted by relative amplitude and may not correspond to the peak power or FWHM center wavelength. See the Specs tab above for details.
At Operating Current
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm

810 nm Superluminescent Diodes with 30 nm Typical 3 dB Bandwidth
Extremely Low Typical Gain Ripple
13 mW Minimum Fiber-Coupled Output Power

This superluminescent diode is designed to be used in OCT Systems that require an illumination source with extremely low gain ripple of 0.03 dB (RMS) and a relatively flat spectrum over a 30 nm wide 3 dB bandwidth. It is available with a minimum fiber-coupled output power of 13 mW.

Note that the specifications in the table to the right are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note that the bandwidth will decrease as the current is decreased; bandwidth specifications to the right are specified at the operating current.

830 nm Superluminescent Diodes for OCT

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830 nm Superluminescent Diodes with 20 nm, 55 nm, 60 nm Typical 3 dB Bandwidth
Extremely Low Typical Gain Ripple
10 mW or 20 mW Minimum Fiber-Coupled Output Power

These superluminescent diodes are designed to be used in OCT Systems that require an illumination source with extremely low gain ripple of 0.03 dB or 0.06 dB (RMS) and a relatively flat spectrum over a 20 nm, 55 nm, or 60 nm wide 3 dB bandwidth. They are available with a minimum fiber-coupled output power of 10 mW or 20 mW.

Note that the specifications in the table below are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note that the bandwidth will decrease as the current is decreased; bandwidth specifications below are specified at the operating current.

Item #^a	SLD830S-A10W			SLD830S-A20W			SLD830S-A10			SLD830S-A20
Parameter	Min	Typ.	Max	Min	Typ.	Max	Min	Typ.	Max	Min	Typ.	Max
Operating Current	-	-	240 mA	-	-	330 mA	-	-	150 mA	-	-	240 mA
Center Wavelength^b	815 nm	830 nm	845 nm	815 nm	830 nm	845 nm	820 nm	830 nm	840 nm	820 nm	830 nm	840 nm
Spectral Shape	Flat Top			Flat Top			Near Gaussian			Near Gaussian
ASE Power^c,d	10 mW	-	-	20 mW	-	-	10 mW	13 mW	-	20 mW	22 mW	-
Optical 3 dB Bandwidth^c,e	50 nm	60 nm	-	40 nm	55 nm	-	17 nm	20 nm	-	17 nm	20 nm	-
Optical 20 dB Bandwidth^c	-	-	-	-	-	-	-	50 nm	-	-	50 nm	-
RMS Gain Ripple^c,f	-	0.06 dB	0.3 dB	-	0.03 dB	0.3 dB	-	0.03 dB	0.15 dB	-	0.03 dB	0.15 dB
Fiber Type	780HP
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^f

Full specifications are available by clicking on the Specs tab above.
The center wavelength for an SLD with a flat-top spectral shape is defined as the midpoint of the 3 dB bandwidth; for an SLD with a near-gaussian spectral shape, the center wavelength is defined by an average weighted by relative amplitude and may not correspond to the peak power or FWHM center wavelength. See the Specs tab above for details.
At Operating Current
Corresponds to the output of the fiber pigtail.
For SLD830S-A10W and SLD830S-A20W: At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Measurement Resolution = 0.02 nm

850 nm Superluminescent Diodes for OCT

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850 nm Superluminescent Diodes with 55 nm or 60 nm Typical 3 dB Bandwidth
Extremely Low Typical Gain Ripple
10 mW or 20 mW Minimum Fiber-Coupled Output Power

These superluminescent diodes are designed to be used in OCT Systems that require an illumination source with extremely low typical gain ripple of 0.03 dB (RMS) and a relatively flat spectrum over a 55 nm or 60 nm wide 3 dB bandwidth. They are available with a minimum fiber-coupled output power of 10 mW or 20 mW.

Item #^a	SLD850S-A10W			SLD850S-A20W
Parameter	Min	Typ.	Max	Min	Typ.	Max
Operating Current	-	-	180 mA	-	-	340 mA
Center Wavelength^b	835 nm	850 nm	865 nm	835 nm	850 nm	865 nm
Spectral Shape	Flat Top			Flat Top
ASE Power^c,d	10 mW	-	-	20 mW	-	-
Optical 3 dB Bandwidth^c,e	40 nm	60 nm	-	40 nm	55 nm	-
RMS Gain Ripple^c,f	-	0.03 dB	0.3 dB	-	0.03 dB	0.3 dB
Fiber Type	780HP
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^f

Full specifications are available by clicking on the Specs tab above.
Defined as the midpoint of the 3 dB bandwidth. See the Specs tab above for details.
At Operating Current
Corresponds to the output of the fiber pigtail.
At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Measurement Resolution = 0.02 nm

930 nm Superluminescent Diodes for OCT

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Item #^a

SLD930x-A40W

Parameter

Min

Typ.

Max

Operating Current

800 mA

Center Wavelength^b

915 nm

930 nm

945 nm

Spectral Shape

Flat Top

ASE Power^c,d

36 mW

40 mW

Optical 3 dB Bandwidth^c

40 nm

45 nm

RMS Gain Ripple^c,e

0.06

0.3

Fiber Type

780HP (SM)
PM780-HP (PM)^g

Performance Graphs (Click Icons for Plots)

Output Spectrum

LIV Plot

Gain Ripple^e

Full specifications are available by clicking on the Specs tab above.
Defined as the midpoint of the 3 dB bandwidth. See the Specs tab above for details.
Specification given at the operating current. At the minimum ASE power, the minimum 3 dB bandwidth is guaranteed.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Connector key is aligned to slow axis.

930 nm SLDs with 40 nm Typical 3 dB Bandwidth
45 mW Typical Fiber-Coupled Output Power
FC/APC-Terminated Fiber Pigtail Minimizes Optical Feedback

These superluminescent diodes are designed to be used in OCT Systems. They have a low typical RMS gain ripple of 0.06 dB, a relatively flat spectrum over a 45 nm wide typical 3 dB bandwidth, and 40 mW typical fiber-coupled output power.

970 nm Superluminescent Diode for OCT

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Item #^a	SLD970S-A40W
Parameter	Min	Typ.	Max
Operating Current	-	1000 mA	1010 mA
Center Wavelength^b	945 nm	970 nm	995 nm
Spectral Shape	Flat Top
ASE Power^c,d	35 mW	40 mW
Optical 3 dB Bandwidth^c	40 nm	50 nm
RMS Gain Ripple^c,e		0.03 dB	0.2 dB
Fiber Type	HI1060 (SM) PM980-XP (PM)^f
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^f

Full specifications are available by clicking on the Specs tab above.
Defined as the midpoint of the 3 dB bandwidth. See the Specs tab above for details.
Specification given at operating current. At the minimum ASE power, we guarantee the minimum 3 dB bandwidth.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Connector key aligned to slow axis.

970 nm Superluminescent Diodes with 50 nm Typical 3 dB Bandwidth
40 mW Typical Fiber-Coupled Output Power
FC/APC-Terminated Fiber Pigtail Minimizes Optical Feedback

This superluminescent diode is designed to be used in OCT Systems. It has a low typical gain ripple of 0.03 dB (RMS) and a relatively flat spectrum over a 50 nm wide 3 dB bandwidth. This SLD is available with a typical fiber-coupled output power of 40 mW.

Note that the specifications in the table to the right are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note that the bandwidth will decrease as the current is decreased; bandwidth specifications below are specified at the operating current.

1050 nm Superluminescent Diode for OCT

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1050 nm Superluminescent Diode with 70 nm Typical 3 dB Bandwidth
60 mW Typical Fiber-Coupled Output Power
FC/APC-Terminated Fiber Pigtail Minimizes Optical Feedback

This superluminescent diode is designed to be used in OCT Systems. It has a low typical gain ripple of 0.03 dB (RMS) and a relatively flat spectrum over a 70 nm wide 3 dB bandwidth. This SLD is available with a typical fiber-coupled output power of 60 mW.

Note that the specifications in the table below are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note that the bandwidth will decrease as the current is decreased; bandwidth specifications below are specified at the operating current.

Item #^a	SLD1050S-A60			SLD1050P-A60
Parameter	Min	Typ.	Max	Min	Typ.	Max
Operating Current	-	-	1010 mA	-	-	1010 mA
Center Wavelength^b	1025 nm	1050 nm	1075 nm	1025 nm	1050 nm	1075 nm
Spectral Shape	Flat Top			Flat Top
ASE Power^c,d	55 mW	60 mW	-	55 mW	60 mW	-
Optical 3 dB Bandwidth^c	60 nm	70 nm	-	60 nm	70 nm	-
Optical 20 dB Bandwidth^c	-	100 nm	-	-	-	-
RMS Gain Ripple^c,e	-	0.03 dB	0.2 dB	-	0.06 dB	0.2 dB
Fiber Type	HI1060			PM980-XP^f
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot
Gain Ripple^e

Full specifications are available by clicking on the Specs tab above.
Defined as the midpoint of the 3 dB bandwidth. See the Specs tab above for details.
Specification given at operating current. At the minimum ASE power, we guarantee the minimum 3 dB bandwidth.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm
Connector key aligned to the slow axis.

1310 nm Superluminescent Diode for OCT

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Item #^a	SLD1021S
Parameter	Min	Typ.	Max
Operating Current	-	700 mA	900 mA
Center Wavelength^b	1290 nm	-	1330 nm
Spectral Shape	Near Gaussian
ASE Power^c,d	10 mW	12.5 mW	-
Optical 3 dB Bandwidth^c	80 nm	85 nm	-
RMS Gain Ripple^c,e	-	-	0.35 dB
Fiber Type	SMF-28e+
Performance Graphs (Click Icons for Plots)
Output Spectrum
LIV Plot

Full specifications are available by clicking on the Specs tab above.
Defined by an average weighted by relative amplitude. See the Specs tab for details.
Specification given at operating current. At the minimum ASE power, we guarantee the minimum 3 dB bandwidth.
Corresponds to the output of the fiber pigtail.
Measurement Resolution = 0.02 nm

1310 nm Superluminescent Diode with 70 nm Typical 3 dB Bandwidth
60 mW Typical Fiber-Coupled Output Power
FC/APC-Terminated Fiber Pigtail Minimizes Optical Feedback

This superluminescent diode is designed to be used in OCT Systems. It has a low max gain ripple of 0.35 dB (RMS) and a relatively flat spectrum over a 85 nm wide 3 dB bandwidth. This SLD is available with a typical fiber-coupled output power of 12.5 mW.

Note that the specifications in the table to the right are given as guidelines. The characterization sheet shipped with each SLD provides the minimum, maximum, and recommended operating parameters and specifications specific to that device. Note that the bandwidth will decrease as the current is decreased; bandwidth specifications below are specified at the operating current.