Zinc Selenide Plano-Convex Lenses, AR Coated: 4.5 - 7.5 µm

AR Coated for 4.5 - 7.5 µm
Choose from Ø1/2" or Ø1" Sizes
Suitable for MIR Laser Applications
Excellent for IR Imaging, Biomedical, or Military Applications

LA7477-E2

Ø1/2" Lens
f = 15.0 mm

LA7753-E2

Ø1" Lens
f = 1000.0 mm

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Overview
Graphs
Mounting Options
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Specifications
Substrate Material	Laser Grade Zinc Selenide^a
AR Coating Range	4.5 - 7.5 μm
Reflectance over AR Coating Range @ 0° AOI	R_avg < 1.0%, R_abs < 2.0%
Transmission over AR Coating Range @ 0° AOI	T_avg > 97%, T_abs > 94%
Diameter Tolerance	+0.00/-0.10 mm
Thickness Tolerance	±0.1 mm
Focal Length Tolerance	±1%
Surface Quality	60-40 Scratch-Dig
Surface Flatness (Plano Side)	λ/2
Spherical Surface Power^c (Convex Side)	3λ/2
Surface Irregularity (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 Link for Detailed Specifications on the Substrate
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 4.5 - 7.5 μm Range
Focal Lengths from 15.0 mm to 1000.0 mm Available

Thorlabs' Ø1/2" and Ø1" Zinc Selenide (ZnSe) Plano-Convex Lenses are available with a broadband AR coating optimized for the 4.5 - 7.5 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 97% over the entire AR coating range. See the Graphs tab for detailed information.

ZnSe lenses are typically used as collimators for laser applications, such as biomedical and military applications. These lenses are also particularly well suited for use with high-power CO or CO₂ lasers. Additionally, they may provide enough transmission in the visible region to allow the use of a visible alignment beam, although back reflections may be more pronounced.

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.

When handling optics, one should 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, including wearing gloves when handling these lenses and thoroughly washing your hands afterward. Click here to download a pdf of the MSDS for ZnSe.

Thorlabs will accept all ZnSe lenses 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

In the graphs below, the shaded regions denote the specified AR coating range. Performance outside of the specified range is not guaranteed and varies from lot to lot.

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Click Here for Raw Data

Reflectance of the -E2 AR Coating at 8 degrees angle of incidence

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Click Here for Raw Data

Transmission of a 2 mm Thick ZnSe Lens with -E2 AR Coating.

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Click Here for Raw Data
This graph shows the measured transmission of a 2.1 mm thick AR-coated zinc selenide lens at normal incidence, for reference. The performance of the lenses below will vary dependent on the thickness of the relevant component.

AR Coated Zinc Selenide Window Transmission

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Click Here for Raw Data
This graph shows the measured transmission of a 5 mm thick AR-coated zinc selenide window at normal incidence, for reference. The performance of the lenses below will vary dependent on the thickness of the relevant component.

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CXY1A Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System

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Ø1" Optic Mounted in a
ST1XY-S XY Translator

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LMR1 Fixed Mount with Ø1" Lens

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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)
CXY1A		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	Center Thickness	Edge Thickness^b	Back Focal Length^c
LA7477-E2	12.7 mm	15.0 mm	+66.6	21.0 mm	3.0 mm	2.0 mm	13.8 mm
LA7733-E2	12.7 mm	20.0 mm	+50.0	28.1 mm	2.7 mm	2.0 mm	18.9 mm
LA7673-E2	12.7 mm	40.0 mm	+25.0	56.1 mm	2.4 mm	2.0 mm	39.0 mm

Suggested Fixed Lens Mount: LMR05(LMR05/M)

Reciprocal of focal length in meters.
Edge thickness is measured before the chamfer is added.
This value is calculated for the design wavelength, 10.6 µm, and provided as a reference. The actual value will depend on the exact center thickness and radius of curvature.

Ø1" ZnSe Plano-Convex Lenses

Item #	Diameter	Focal Length	Diopter^a	Radius of Curvature	Center Thickness	Edge Thickness^b	Back Focal Length^c
LA7542-E2	25.4 mm	25.4 mm	+39.4	35.6 mm	4.3 mm	2.0 mm	23.6 mm
LA7656-E2	25.4 mm	50.1 mm	+20.0	70.2 mm	4.0 mm	2.8 mm	48.4 mm
LA7660-E2	25.4 mm	75.0 mm	+13.3	105.2 mm	4.0 mm	3.2 mm	73.0 mm
LA7261-E2	25.4 mm	100.2 mm	+10.0	140.5 mm	4.0 mm	3.4 mm	98.5 mm
LA7028-E2	25.4 mm	149.0 mm	+6.7	209.0 mm	4.0 mm	3.6 mm	147.3 mm
LA7228-E2	25.4 mm	200.0 mm	+5.0	280.5 mm	4.0 mm	3.7 mm	199.3 mm
LA7270-E2	25.4 mm	500.0 mm	+2.0	701.3 mm	2.1 mm	2.0 mm	499.1 mm
LA7234-E2	25.4 mm	750.0 mm	+1.3	1052.0 mm	2.1 mm	2.0 mm	749.1 mm
LA7753-E2	25.4 mm	1000.0 mm	+1.0	1402.7 mm	2.1 mm	2.0 mm	999.1 mm

Suggested Fixed Lens Mount: LMR1(LMR1/M)

Reciprocal of focal length in meters.
Edge thickness is measured before the chamfer is added.
This value is calculated for the design wavelength, 10.6 µm, and provided as a reference. The actual value will depend on the exact center thickness and radius of curvature.

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

+1 Qty Docs Part Number - Universal Price Available

LA7542-E2 Ø1" ZnSe Plano-Convex Lens, f = 25.4 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7656-E2 Ø1" ZnSe Plano-Convex Lens, f = 50.1 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7660-E2 Ø1" ZnSe Plano-Convex Lens, f = 75.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7261-E2 Ø1" ZnSe Plano-Convex Lens, f = 100.2 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7028-E2 Ø1" ZnSe Plano-Convex Lens, f = 149.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7228-E2 Ø1" ZnSe Plano-Convex Lens, f = 200.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7270-E2 Ø1" ZnSe Plano-Convex Lens, f = 500.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7234-E2 Ø1" ZnSe Plano-Convex Lens, f = 750.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

LA7753-E2 Ø1" ZnSe Plano-Convex Lens, f = 1000.0 mm, AR-Coated: 4.5 - 7.5 µm

$320.37

Today

Plano-Convex	E4 Coated (2 - 13 µm)
	E2 Coated (4.5 - 7.5 µm)
	E3 Coated (7 - 12 µm)
Bi-Convex	E3 Coated (7 - 12 µm)
Plano-Concave	E4 Coated (2 - 13 µm)
	E2 Coated (4.5 - 7.5 µm)
	E3 Coated (7 - 12 µm)
Bi-Concave	E3 Coated (7 - 12 µm)
Positive Meniscus	E3 Coated (7 - 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 (2 - 5 µm or 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)
Magnesium Fluoride	Plano-Convex	Uncoated (0.2 - 6 µm)
Barium Fluoride	Plano-Convex	E Coated (2 - 5 µm)
Silicon	Plano-Convex	E Coated (2 - 5 µm)
Germanium	Plano-Convex	E3 Coated (7 - 12 µm)