Zinc Selenide ZnSe Windows 1.65-3μm Coated, ZnSe Window

Zinc Selenide is employed in optical windows, lenses, mirrors, and prisms, particularly for infrared applications. Its transmission range spans from 0.5 µm to 22 µm and is commonly used in high-power CO2-laser optics at 10.6 microns. Zinc Selenide is synthesized from zinc vapor and H2Se gas, forming sheets on graphite susceptors. It features a microcrystalline structure, with the grain size optimized for maximum strength. Single crystal ZnSe is also available.




SHAPE OPTICS Zinc Selenide (ZnSe) Protective Window Specifications

Parameter Specification
Bevel Protective as needed
Clear Aperture CA (mm)
Clear Aperture (%) 90
Diameter (mm) +0.0/-0.1
Thickness (mm)  ±0.1
Coating BBAR (1650-3000nm)
Coating Specification R_avg <1% @ 1650 – 3000nm<br>R_abs <2% @ 1650 – 3000nm
Density (g/cm³) 5.27
Coefficient of Thermal Expansion CTE (10^-6/°C) 7.57
Edges Fine Ground
Index of Refraction n_d 2.631
Knoop Hardness (kg/mm²) 120
Poisson’s Ratio 0.28
Parallelism (arcmin) <1
Substrate Zinc Selenide (ZnSe)
Surface Quality 60-40
Surface Flatness (P-V) λ/10 @ 10.6µm
Type Protective Window
Wavelength Range (nm) 1650 – 3000

These specifications outline the key parameters and characteristics of SHAPE OPTICS Zinc Selenide (ZnSe) Protective Windows, making them suitable for a wide range of infrared optical applications. For further assistance or to place an order, please visit our online store or contact our sales team.

Zinc selenide (ZnSe) is a versatile material in optical engineering because of its broad transmission range and specific properties. Here are some key points about it:

  1. Applications:
    • Infrared Optics: ZnSe is widely used for infrared (IR) applications due to its high transmittance across a broad spectral range, particularly from 0.5 to 22 microns. It is suitable for windows, lenses, mirrors, and prisms.
    • CO2 Lasers: It is a preferred material for high-power CO2 laser optics, especially at 10.6 microns, the wavelength at which CO2 lasers operate.Zinc Selenide ZnSe Windows Transmission for 3mm thickness
  2. Manufacturing:
    • ZnSe is synthesized by combining zinc vapor and hydrogen selenide gas. The synthesis process allows it to form as sheets on graphite susceptors.
    • The material is microcrystalline in structure, and grain size is carefully controlled for optimal mechanical strength.
    • Single-crystal ZnSe is also available and used in specific applications where higher purity and uniformity are needed.

These characteristics make ZnSe a sought-after material for high-performance optical applications, especially where thermal durability and broad-spectrum transmittance are required.


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Common Specifications

Type: Protective Window

  • Material: Zinc Selenide (ZnSe)
  • Clear Aperture: 90% of diameter
  • Density: 5.27 g/cm³
  • Coefficient of Thermal Expansion (CTE): 7.57 x 10^-6 /°C
  • Knoop Hardness: 120 kg/mm²
  • Poisson’s Ratio: 0.28
  • Index of Refraction (n_d): 2.631
  • Surface Flatness (P-V): λ/10 at 10.6µm
  • Wavelength Range (nm): 600 – 18000

Dimensional Tolerances

  • Diameter Tolerance: +0.0, -0.25 mm
  • Thickness Tolerance: +0.1, -0.25 mm

Surface Characteristics

  • Surface Quality: 40-20 scratch & dig
  • Surface Irregularity: λ/2 per inch @ 633 nm over clear aperture

Alignment & Geometry

  • Edges: Fine Ground
  • Parallelism (arcmin): <1

Coatings (Available Options for ZnSe)

  • BBAR (Broadband Anti-Reflective): Effective for 0.8 to 2.5 µm, 3 to 5 µm, 1 to 5 µm, 8 to 12 µm, and 3 to 12 µm spectral regions.
  • Single Wavelength AR Coating: 10.6µm R ≤ 0.5% per surface.
  • Other Specialized Wavelength Bands: Possible within the 0.6 to 16 µm range.

Zinc Selenide (ZnSe) windows stand out in the field of infrared optics for their superior optical qualities and adaptability to a wide range of demanding applications. Whether used in industrial, military, medical, or scientific settings, ZnSe windows offer reliable performance and high precision, making them a preferred choice for professionals around the globe.

Optical Properties

  • Transmission Range: 0.6 to 21.0 microns
  • Refractive Index: 2.4028 at 10 microns
  • Reflection Loss: 31.11% at 10.6 µm (2 surfaces)
  • Index of Absorption: 0.0005 cm^-1 at 10.6 microns
  • Restrahlen Peak: 45.7 microns
  • dN/dT: +61 x 10^-6/°C at 10.6µm at 298K
  • dN/dμ = 0: 5.5µm

Physical Properties

  • Density: 5.27 g/cm³
  • Melting Point: 1525°C (dissociates about 700°C)
  • Thermal Conductivity: 18 Wm^-1K^-1 at 298K
  • Thermal Expansion: 7.1 x 10^-6/°C at 273K
  • Hardness: Knoop 120 with 50g indenter
  • Specific Heat Capacity: 339 J kg^-1K^-1
  • Young’s Modulus (E): 67.2 GPa
  • Bulk Modulus (K): 40 GPa
  • Apparent Elastic Limit: 55.1 MPa (8,000psi)
  • Poisson’s Ratio: 0.28

Chemical Properties

  • Solubility: 0.001 g/100g water
  • Molecular Weight: 144.33
  • Class/Structure: HIP polycrystalline cubic, ZnS, F43m