Key Features

Dual-band compatibility

Transmittance range covers 0.5-22 μm, perfectly compatible with mid-wave infrared (MWIR) and long-wave infrared (LWIR), with optimal performance at 10.6 μm.
Preferred for high-power lasers

Extremely low absorption coefficient (< 0.0005 cm⁻¹ @ 10.6 μm), strong thermal shock resistance, making it an ideal material for handling high-power CO₂ lasers.
Visible light-assisted alignment

Has a certain transmittance in the visible light band (pale yellow or orange), making system optical path alignment much easier than with silicon lenses (completely opaque).
Material Characteristics

Relatively soft: Mohs hardness is only 2.5~3, easily scratched during processing, unsuitable for harsh environments; Good chemical stability: Non-hygroscopic, chemically stable. Good chemical stability: Non-hygroscopic, chemically stable.

Specification of ZnSe Lens

Material	ZnSe (Zinc Selenide)
Design wavelength	10.6μm
Focal length tolerance	± 1%
Dimension tolerance	+0.0/-0.1mm
Thickness tolerance	±0.2mm
Surface accurcay	λ/2-λ/4@632.8nm
Surface quality	60-40, 40-20
Centration	< 3 arc min
Clear aperture	> 80%
Chamfer	< 0.2 x 45°
Coating	IR AR Coating 8-12 μm

Laser Focus Lens

ECOPTIK using USA import CVD material, material has no impurity absorption, scattering loss is very low. Therefore, become the preferred materials for optical device fabrication of high-power CO2 laser system. In addition, in the whole transmission band, but also in the different optical systems commonly used materials.

Part No.	Diameter		Focal Length		Thickness		Material
Part No.	mm	inch	mm	inch	mm	inch
ECO-CL-D12.7F50.8	12.7	0.5	50.8	2	1.6	0.06	CVD ZnSe, GaAS
ECO-CL-D15F38.1	15	0.59	38.1	1.5	1.8	0.07	CVD ZnSe, GaAS
ECO-CL-D18F50.8	18	0.71	50.8	2	2	0.08	CVD ZnSe, GaAS
ECO-CL-D19.05F63.5	19.05	0.75	63.5	2.5	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F50.8	20	0.79	50.8	2	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F63.8			63.5	2.5	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F75			75	3	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F101.6			101.6	4	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F127			127	5	2	0.08	CVD ZnSe, GaAS
ECO-CL-D20F190.5			190.5	7.5	2	0.08	CVD ZnSe, GaAS
ECO-CL-D25.4F101.6	25.4	1	101.6	4	2.5	0.1	CVD ZnSe, GaAS
ECO-CL-D25.4F50.8			50.8	2	2.5	0.1	CVD ZnSe, GaAS
ECO-CL-D25.4F63.5			63.5	2.5	2.5	0.1	CVD ZnSe, GaAS

The suitable laser wavelength λ=10.6um，usual focal length:F38.1mm,F50.8mm,F63.5mm,etc.

ECOPTIK provide the customized producing.

Typical Application Areas

High-power CO₂ laser processing

Used as focusing lenses and protective windows in laser cutting, welding, and marking machines, capable of withstanding laser power from hundreds to thousands of watts.
Infrared thermal imaging and FLIR systems

Used in the manufacture of thermal imager lenses to capture the long-wave infrared radiation of objects, widely applied in security, temperature measurement, military night vision, and other fields.
Spectroscopy and medicine

As a key component of Fourier transform infrared spectrometers (FTIR); also used for beam calibration in medical lasers and biomedicine.