Zinc Selenide (ZnSe) Windows
Broad Transmission Range: ZnSe windows provide excellent transmission from 0.6 μm to 16 μm, making them versatile for various IR applications.
Low Absorption Coefficient: The low absorption in the IR range ensures minimal signal loss and high transmission efficiency.
Low Chromatic Dispersion: This property minimizes signal distortion, enabling accurate transmission of IR radiation.
Thermal Properties: High thermal shock resistance and low absorption make ZnSe windows suitable for thermally demanding applications.
High-Power CO2 Lasers: ZnSe windows are ideal for use in high-power CO2 lasers due to their outstanding thermal properties.
Optical Purity: Made from high-purity CVD ZnSe grown in the USA, ensuring superior optical quality.
Applications: CO2 lasers, thermal imaging cameras, IR systems, etc.
Zinc Selenide (ZnSe) Windows are highly valued for their exceptional transmission properties across a broad wavelength range, making them ideal for a variety of infrared (IR) applications. These windows offer extensive transmission from 0.6 μm to 16 μm and are particularly optimized for the IR range of 3-16 μm after applying anti-reflection (AR) coatings.
Physical and Optical Properties:
| Materials | CVD ZnSe crystals |
| Aperture | >90% |
| Dimension Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | +/-0.2mm |
| Surface Quality | 60/40 S/D |
| Chamfer | 0.3-0.5mmx45degree |
| Coating | AR or BBAR |
| Transmission Range | 0.6 to 16μm |
| Refractive Index | 2.4028 @ 10.6 μm |
| Reflection Loss | 29.1% at 10.6 μm (2 surfaces) |
| Absorption Coefficient | 0.0005 cm-1 at 10.6 μm |
| Reststrahlen Peak | 45.7 μm |
| dn/dT | +61 x 10-6 /°C at 10.6 μm at 298K |
| dn/dμ = 0 | 5.5 μm |
| Thermal Conductivity | 18 W m-1 K-1 at 298K |
| Melting Point | 1525°C (see notes below) |
| Hardness | Knoop 120 with 50g indenter |
| Thermal Expansion | 7.1 x 10-6 /°C at 273K |
| Dielectric Constant | n/a |
| Specific Heat Capacity | 339 J Kg-1 K-1 |
| Shear Modulus (G) | n/a |
| Density | 5.27 g/cc |
| Youngs Modulus (E) | 67.2 GPa |
| Apparent Elastic Limit | 55.1 MPa (8000 psi) |
| Bulk Modulus (K) | 40 GPav |
| Elastic Coefficients | Not Available |
| Poisson Ratio | 0.28 |
| Solubility | 0.001g/100g water |
| Molecular Weight | 144.33 |
| Class/Structure | HIP polycrystalline cubic, ZnS, F43m |
Advantages of Zinc Selenide Windows:
- Broad Transmission Range: ZnSe windows provide excellent transmission from 0.6 μm to 16 μm, making them versatile for various IR applications.
- Low Absorption Coefficient: The low absorption in the IR range ensures minimal signal loss and high transmission efficiency.
- Low Chromatic Dispersion: This property minimizes signal distortion, enabling accurate transmission of IR radiation.
- Thermal Properties: High thermal shock resistance and low absorption make ZnSe windows suitable for thermally demanding applications.
- High-Power CO2 Lasers: ZnSe windows are ideal for use in high-power CO2 lasers due to their outstanding thermal properties.
- Optical Purity: Made from high-purity CVD ZnSe grown in the USA, ensuring superior optical quality.
Coating Options:
Given the high refractive index of ZnSe, anti-reflection (AR) coatings are crucial to maximize transmission. Kingwin Optics offers various coating options to suit different needs:
- AR Coatings: For specific wavelength ranges.
- BBAR Coatings: For broadband anti-reflection performance across 3-12 μm or other specified ranges.
Applications:
- High-Power CO2 Lasers: Used in systems requiring robust materials with high thermal conductivity and low absorption.
- Thermal Imaging Cameras: Ideal for cameras operating in the MWIR and LWIR ranges.
- Infrared Systems: Suitable for a wide range of IR applications due to their broad transmission range and low dispersion.
Handling and Maintenance:
- Softness and Chemical Sensitivity: ZnSe is relatively soft and chemically sensitive, necessitating careful cleaning, handling, and mounting to avoid damage.
Custom and Off-the-Shelf Solutions:
Kingwin Optics offers both off-the-shelf and custom ZnSe Windows. The maximum diameter available is 200 mm, with a clear aperture greater than 90%. Custom solutions can be tailored to meet specific requirements, ensuring optimal performance for your applications.
Zinc Selenide Windows from Kingwin Optics provide exceptional performance for a wide range of IR applications, thanks to their broad transmission range, low absorption, and high thermal shock resistance. With various coating options and high purity material, these windows are ideal for high-power CO2 lasers, thermal imaging cameras, and other demanding IR systems. Customizable options ensure that your specific needs are met with precision and quality.
