Zinc Selenide Plano-Convex Lenses, AR Coated: 2 - 13 µm

AR Coating Optimized for the 2 - 13 µm Range
Choose from Ø1/2'' or Ø1'' Sizes
Suitable for CO₂ Laser and IR Imaging Applications

LA7477-E4

Ø1/2'' Lens

f = 15 mm

LA7542-E4

Ø1'' Lens

f = 25.4 mm

LA7753-E4

Ø1'' Lens

f = 1000 mm

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Overview
Graphs
Mounting Options
Feedback

Specifications
Substrate Material	Zinc Selenide^a
AR Coating Range	2.0 - 13.0 μm
Reflectance^b(Per Surface)	R_avg < 3.5% R_abs < 6%
Transmission^b	T_avg > 92% T_abs > 85%
Diameter Tolerance	+0.0/-0.1 mm
Thickness Tolerance	±0.1 mm
Focal Length Tolerance	±1%
Surface Quality	60-40 Scratch-Dig
Surface Flatness^c (Plano Side)	λ/2
Spherical Surface Power^c,d (Convex Side)	3λ/2
Surface Irregularity^c (Peak to Valley)	λ/2
Centration	<3 arcmin
Clear Aperture	Ø1/2" Lenses: >Ø10.2 mm Ø1" Lenses: >Ø20.3 mm
Design Wavelength	10.6 μm

Click the link for detailed specifications on the substrate.
Over AR Coating Range, 0° AOI
At 633 nm.
Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.

Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

Features

ZnSe Substrate
Ø1/2" and Ø1" Versions Available
Broadband AR Coating for the 2 - 13 μm Range
Focal Lengths from 15 mm to 1000 mm Available
Transmissive for Red Alignment Lasers

Thorlabs' Ø1/2" and Ø1" Zinc Selenide (ZnSe) Plano-Convex Lenses are available with a broadband antireflection (AR) coating optimized for the 2 µm to 13 μm spectral range deposited on both surfaces. This coating greatly reduces the high surface reflectance of the substrate, yielding an average transmission in excess of 92% over the entire AR coating range. See the Graphs tab for detailed information.

ZnSe lenses are commonly used in IR imaging, biomedical, and military applications. The lenses below are also particularly well suited for use with high-power CO₂ lasers. Additionally, they provide enough transmission in the visible region to allow the use of a red alignment beam.

Usage
To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using a plano-convex lens to focus a collimated light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.

This substrate scratches easily and should be handled with care. When handling optics, always wear gloves. This is especially true when working with zinc selenide, as it is a hazardous material. For your safety, please follow all proper precautions. For the MSDS for ZnSe in English, click here, and for the MSDS in Japanese, click here. Thorlabs will accept all ZnSe windows back for proper disposal. Please contact Tech Support to make arrangements for this service.

Selection Guide

Zinc Selenide Lenses

Other MIR Lenses

Other Spherical Singlets

AR Coated Zinc Selenide Window Transmission

Click to Enlarge
Click for Raw Data
This graph shows the measured transmission of an AR-coated zinc selenide window (Item # WG71050-E4) at normal incidence. The shaded region denotes the AR coating range, over which T_avg > 92%. Performance outside of the specified range is not guaranteed and varies from lot to lot.

Click to Enlarge
Click for Raw Data
This plot gives the measured reflectance (per surface) at an 8° angle of incidence (AOI) of our -E4 AR-coated zinc selenide substrates. The average reflectance is <3.5% per surface within the shaded wavelength range of 2.0 - 13.0 µm.

Click to Enlarge
CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System

Click to Enlarge
Ø1" Optic Mounted in a
ST1XY-S XY Translator

Click to Enlarge
LMR1 Fixed Mount with Ø1" Lens

Click to Enlarge
LM2XY Translating Mount with Ø2" Lens

Recommended Mounting Options for Thorlabs Lenses
Item #		Mounts for Ø2 mm to Ø10 mm Optics
Imperial	Metric	Mounts for Ø2 mm to Ø10 mm Optics
(Various)		Fixed Lens Mounts and Mini-Series Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm
(Various)		Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø2 mm to Ø10 mm
Item #		Mounts for Ø1/2" (Ø12.7 mm) Optics
Imperial	Metric	Mounts for Ø1/2" (Ø12.7 mm) Optics
LMR05	LMR05/M	Fixed Lens Mount for Ø1/2" Optics
MLH05	MLH05/M	Mini-Series Fixed Lens Mount for Ø1/2" Optics
LM05XY	LM05XY/M	Translating Lens Mount for Ø1/2" Optics
SCP05		16 mm Cage System, XY Translation Mount for Ø1/2" Optics
(Various)		Ø1/2" Lens Tubes, Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below)
Item #		Mounts for Ø1" (Ø25.4 mm) Optics
Imperial	Metric	Mounts for Ø1" (Ø25.4 mm) Optics
LMR1	LMR1/M	Fixed Lens Mount for Ø1" Optics
LM1XY	LM1XY/M	Translating Lens Mount for Ø1" Optics
ST1XY-S	ST1XY-S/M	Translating Lens Mount with Micrometer Drives (Other Drives Available)
CXY1		30 mm Cage System, XY Translation Mount for Ø1" Optics
(Various)		Ø1" Lens Tubes, Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below)
Item #		Mount for Ø1.5" Optics
Imperial	Metric	Mount for Ø1.5" Optics
LMR1.5	LMR1.5/M	Fixed Lens Mount for Ø1.5" Optics
(Various)		Ø1.5" Lens Tubes, Optional SM1.5RR Retaining Ring for Ø1.5" Lens Tubes and Mounts
Item #		Mounts for Ø2" (Ø50.8 mm) Optics
Imperial	Metric	Mounts for Ø2" (Ø50.8 mm) Optics
LMR2	LMR2/M	Fixed Lens Mount for Ø2" Optics
LM2XY	LM2XY/M	Translating Lens Mount for Ø2" Optics
CXY2		60 mm Cage System, XY Translation Mount for Ø2" Optics
(Various)		Ø2" Lens Tubes, Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below)
Item #		Adjustable Optic Mounts
Imperial	Metric	Adjustable Optic Mounts
LH1	LH1/M	Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics
LH2	LH2/M	Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics
VG100	VG100/M	Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics
SCL03	SCL03/M	Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics
SCL04	SCL04/M	Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics
LH160C	LH160C/M	Adjustable Mount for 60 mm Cage Systems, Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics
SCL60C	SCL60C/M	Self-Centering Mount for 60 mm Cage Systems, Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics

Mounting High-Curvature Optics

Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.

Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.

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Ø1/2" ZnSe Plano-Convex Lenses

Item #	Diameter	Focal Length	Diopter^a	Radius of Curvature	Edge Thickness^b	Center Thickness	Back Focal Length
LC7477-E4	12.7 mm	15.0 mm	+66.7	21.0 mm	2.0 mm	3.0 mm	13.8 mm
LC7733-E4	12.7 mm	20.0 mm	+50.0	28.1 mm	2.0 mm	2.7 mm	18.9 mm
LC7673-E4	12.7 mm	40.0 mm	+25.0	56.1 mm	2.0 mm	2.4 mm	39.0 mm

Reciprocal of the Focal Length in Meters
Edge Thickness Value is Given Before the 0.2 mm Losses Due to Each 45° Typical Chamfer

Suggested Fixed Lens Mount: LMR05(/M) or MLH05(/M)

Ø1" ZnSe Plano-Convex Lenses

Item #	Diameter	Focal Length	Diopter^a	Radius of Curvature	Edge Thickness^b	Center Thickness	Back Focal Length
LA7542-E4	25.4 mm	25.4 mm	+39.4	35.6 mm	2.0 mm	4.3 mm	23.6 mm
LA7656-E4	25.4 mm	50.1 mm	+20.0	70.2 mm	2.8 mm	4.0 mm	48.4 mm
LA7660-E4	25.4 mm	75.0 mm	+13.3	105.2 mm	3.2 mm	4.0 mm	73.0 mm
LA7261-E4	25.4 mm	100.2 mm	+10.0	140.5 mm	3.4 mm	4.0 mm	98.5 mm
LA7028-E4	25.4 mm	149.0 mm	+6.7	209.0 mm	3.6 mm	4.0 mm	147.3 mm
LA7228-E4	25.4 mm	200.0 mm	+5.0	280.5 mm	3.7 mm	4.0 mm	199.3 mm
LA7270-E4	25.4 mm	500.0 mm	+2.0	701.3 mm	2.0 mm	2.1 mm	499.1 mm
LA7234-E4	25.4 mm	750.0 mm	+1.3	1052.0 mm	2.0 mm	2.1 mm	749.1 mm
LA7753-E4	25.4 mm	1000.0 mm	+1	1402.7 mm	2.0 mm	2.1 mm	999.1 mm

Reciprocal of the Focal Length in Meters
Edge Thickness Value is Given Before the 0.2 mm Losses Due to Each 45° Typical Chamfer

Suggested Fixed Lens Mount: LMR1(/M)

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

LA7542-E4 Ø1" ZnSe Plano-Convex Lens, f = 25.4 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7656-E4 Ø1" ZnSe Plano-Convex Lens, f = 50 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7660-E4 Ø1" ZnSe Plano-Convex Lens, f = 75 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7261-E4 Ø1" ZnSe Plano-Convex Lens, f = 100 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7028-E4 Ø1" ZnSe Plano-Convex Lens, f = 150 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7228-E4 Ø1" ZnSe Plano-Convex Lens, f = 200 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7270-E4 Ø1" ZnSe Plano-Convex Lens, f = 500 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7234-E4 Ø1" ZnSe Plano-Convex Lens, f = 750 mm, AR-Coated: 2-13 µm

$440.19

Today

LA7753-E4 Ø1" ZnSe Plano-Convex Lens, f = 1000 mm, AR-Coated: 2-13 µm

$440.19

Today

Plano-Convex	E4 Coated (2 - 13 µm)
Plano-Concave	E4 Coated (2 - 13 µm)
Plano-Convex	E2 Coated (4.5 - 7.5 µm)
Plano-Concave	E2 Coated (4.5 - 7.5 µm)
Plano-Convex	E3 Coated (7 - 12 µm)
Bi-Convex	E3 Coated (7 - 12 µm)
Plano-Concave	F Coated (8 - 12 µm)
Bi-Concave	F Coated (8 - 12 µm)
Positive Meniscus	F Coated (8 - 12 µm)
Negative Meniscus	F Coated (8 - 12 µm)

Calcium Fluoride	Plano-Convex	Uncoated (0.18 - 8.0 µm)
		D Coated (1.65 - 3.0 µm)
		E Coated (2 - 5 µm)
	Bi-Convex	Uncoated (0.18 - 8.0 µm)
	Bi-Convex	E Coated (2 - 5 µm)
	Plano-Concave	Uncoated (0.18 - 8.0 µm)
	Plano-Concave	E Coated (2 - 5 µm)
	Bi-Concave	Uncoated (0.18 - 8.0 µm) E Coated (3 - 5 µm)
	Positive Meniscus	Uncoated (0.18 - 8.0 µm)
	Positive Meniscus	E Coated (2 - 5 µm)
	Negative Meniscus	Uncoated (0.18 - 8.0 µm)
	Negative Meniscus	E Coated (2 - 5 µm)
Germanium	Plano-Convex	E3 Coated (7 - 12 µm)
Barium Fluoride	Plano-Convex	E Coated (2 - 5 µm)
Silicon	Plano-Convex	E Coated (2 - 5 µm)
Magnesium Fluoride	Plano-Convex	Uncoated (0.2 - 6 µm)