TianCheng Optics CO., Ltd.
TianCheng Optics CO., Ltd.
  • znse focus lens
  • znse laser lens
  • znse window
  • znse window manufacturers

ZnSe Window

ZnSe laser lens is well-suited for optical elements in high-resolution thermal imaging equipment. ZnSe also transmits some visible light, unlike Germanium and silicon, thereby allowing for visual optical alignment. However, zinc selenide window is quite soft and will scratch easily. ZnSe window has an index of refraction of 2.403 at 10.6 µm.

  • znse focus lens
  • znse laser lens
  • znse window
  • znse window manufacturers

ZnSe Window Specification

Zinc selenide (ZnSe) windows are a popular choice for a wide range of applications due to their excellent optical properties, including high transmittance in the mid-infrared (IR) region and low absorption in the visible and near-IR regions. They are commonly used in scientific, medical, and industrial applications where optical clarity and high transmission are critical.




1 to 500 mm

Diameter Tolerance

+0/-0.02 mm

Thickness Tolerance

±0.01 mm

Surface Quality


Surface Figure



1 Minute


Uncoated, AR, HR, Beamsplitter, etc.

Properties and Characteristics of ZnSe Windows

Zinc Selenide windows are the best choice for a variety of IR applications and high-power CO2 laser systems. ZnSe has low IR absorption and high resistance to thermal application area. Zinc Selenide windows are best for thermal imaging. Zinc selenide windows are used in infrared imaging applications in scientific, military or search and rescue applications.ZnSe has a high index of refraction which requires an anti-reflection coating to achieve high transmission.ZnSe has good transmission from 3um-12um.Long wavelength transparency is crucial for imaging room temperature objects, which radiate at a peak wavelengths of approximately 10 µm with very low intensity.

Optical Properties

ZnSe windows have a high transmittance of over 90% in the mid-infrared (IR) region, making them an ideal material for use in IR spectroscopy and imaging applications. They also have low absorption in the visible and near-IR regions, making them an ideal choice for high-power laser applications.

Physical Properties

ZnSe windows have a low thermal expansion coefficient and a high thermal conductivity, which makes them an ideal choice for applications that require high thermal stability. They also have a low density and high hardness, which makes them resistant to scratching and other forms of damage.

Applications of ZnSe Windows

Infrared Spectroscopy

ZnSe windows are commonly used in infrared spectroscopy, where their high transmittance in the mid-IR region allows for accurate measurements of molecular vibrations and other spectral features.

Medical Imaging

ZnSe windows are also used in medical imaging applications, such as in endoscopes and other medical devices, where their high transmittance in the mid-IR region allows for detailed imaging of internal tissues and organs.

Laser Systems

ZnSe windows are used in high-power laser systems, such as CO2 lasers, where their low absorption in the visible and near-IR regions allows for efficient transmission of laser energy.

Industrial Applications

ZnSe windows find use in a variety of industrial applications, including gas analysis, semiconductor processing, and environmental monitoring, where their high transmittance and thermal stability make them an ideal choice.

Handling and Maintenance of ZnSe Windows

Proper handling and maintenance are important for maintaining the optical quality of ZnSe windows and ensuring their long-term reliability. It is important to avoid touching the surface of the window with bare hands or other objects, as this can leave oils or other contaminants on the surface that can degrade the optical quality. ZnSe windows should be cleaned using a mild detergent and water solution or with isopropyl alcohol, and it is important to use a soft, lint-free cloth or a lens cleaning tissue to avoid scratching the surface.

ZnSe Windows Handling and Cleaning

ZnSe is very soft material, so we should very careful about it. It requests professional people to make it clean. It is also a toxic material. Great care must be taken in handling and cleaning the material. Wear gloves at all times to avoid the risk of contamination. Hold only the edge to prevent scratches. Wash hands after use. when holding the optics by its edges. wipe the surface gently with a damp cotton ball. Do not rub, and do not exert pressure. use only surgical quality cotton balls.


  1. What is the refractive index of ZnSe?
    A: The refractive index of ZnSe is about 2.4.

  2. What is the thermal conductivity of ZnSe?
    A: The thermal conductivity of ZnSe is about 18 W/mK.

  3. What is the typical thickness of ZnSe windows?
    A: ZnSe windows are available in thicknesses ranging from a few millimeters to several centimeters.

  4. Can ZnSe windows be used in high-power laser applications?
    A: Yes, ZnSe windows have low absorption in the visible and near-IR regions, which makes them an ideal choice for high-power laser applications.

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TianCheng Optics CO., Ltd.
Tian Cheng Optics CO.,Ltd
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    No. 1567 Liu Ying Lu, Kuan Cheng District, Chang Chun, P.R. China

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