Zinc Selenide Double-Concave Lenses — GLH74 Series

From $366 USD

Product description

Zinc selenide (ZnSe) double-concave lenses have two concave surfaces of equal curvature and negative focal length. They diverge incident beams and are used for beam expansion, projection and increasing the focal length of optical systems, including Galilean beam expanders.

Double-concave lenses are generally preferred when the absolute conjugate ratio (object distance divided by image distance) is close to one. Plano-concave lenses are generally preferred for absolute magnification below 0.2 or above 5.

Available coatings: Uncoated; IR2 antireflection coating; average reflectance <1.5% over 8–12μm.

Double-concave lens geometry diagram for GLH74 series — Schematic
Dimensions in mm unless otherwise stated.

ZnSe is used in infrared and thermal imaging systems with a source-stated transmission range of 600 nm to 16 μm. Handle with gloves, avoid direct contact, and wash hands thoroughly afterward; its low hardness requires extra care.

General specifications

General specifications apply at series level. Signed radius values and surface relations follow the source convention; confirm the model drawing for precision optical design.

Material: CVD laser-grade zinc selenide (ZnSe)

Design wavelength: 10.6μm

RoHS: Compliant with RoHS requirements

Surface quality: 60-40

Diameter tolerance: +0.0/-0.1mm

Center thickness tolerance: ±0.2mm

Focal length tolerance: ±1%

Centration error: <3 arcmin

Clear aperture: >90% of diameter

Edge bevel: 0.2mm×45°

Handling note: Use gloves, avoid direct contact, and wash hands after handling.

Available specifications

USD unit prices. Shipping, taxes and dispatch timing are confirmed with your quotation. Select models and quantities to build your quote list.

10 models

Dia. = diameter; CT = center thickness; ET = edge thickness; BFL = back focal length. Units remain shown in each heading.

										Quote
GLH74-025-025	CVD laser-grade zinc selenide (ZnSe)	25.4	-25.4	2	4.3	-25.8	-71.8	Uncoated	$366	Quantity for GLH74-025-025

GLH74-025-050	CVD laser-grade zinc selenide (ZnSe)	25.4	-50	2	3.2	-50.4	-140.8	Uncoated	$366	Quantity for GLH74-025-050

GLH74-025-075	CVD laser-grade zinc selenide (ZnSe)	25.4	-75	2	2.8	-75.4	-211	Uncoated	$366	Quantity for GLH74-025-075

GLH74-025-100	CVD laser-grade zinc selenide (ZnSe)	25.4	-100	2	2.6	-100.4	-281.1	Uncoated	$366	Quantity for GLH74-025-100

GLH74-025-200	CVD laser-grade zinc selenide (ZnSe)	25.4	-200	2	2.3	-200.4	-561.6	Uncoated	$366	Quantity for GLH74-025-200

GLH74-025-025-IR2	CVD laser-grade zinc selenide (ZnSe)	25.4	-25.4	2	4.3	-25.8	-71.8	IR2 antireflection coating; average reflectance <1.5% over 8–12μm	$420	Quantity for GLH74-025-025-IR2

GLH74-025-050-IR2	CVD laser-grade zinc selenide (ZnSe)	25.4	-50	2	3.2	-50.4	-140.8	IR2 antireflection coating; average reflectance <1.5% over 8–12μm	$420	Quantity for GLH74-025-050-IR2

GLH74-025-075-IR2	CVD laser-grade zinc selenide (ZnSe)	25.4	-75	2	2.8	-75.4	-211	IR2 antireflection coating; average reflectance <1.5% over 8–12μm	$420	Quantity for GLH74-025-075-IR2

GLH74-025-100-IR2	CVD laser-grade zinc selenide (ZnSe)	25.4	-100	2	2.6	-100.4	-281.1	IR2 antireflection coating; average reflectance <1.5% over 8–12μm	$420	Quantity for GLH74-025-100-IR2

GLH74-025-200-IR2	CVD laser-grade zinc selenide (ZnSe)	25.4	-200	2	2.3	-200.4	-561.6	IR2 antireflection coating; average reflectance <1.5% over 8–12μm	$420	Quantity for GLH74-025-200-IR2

Curves

Typical transmission or coating performance. Refer to the model’s coating range.

Technical notes

Review the material, dimensions and other specifications listed for the individual model. Check any available curves against the model's stated operating range.

Illustrations and printable specification summaries are reference information, not manufacturing drawings. Confirm technical suitability and final requirements with your quotation.

Quote list

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