Cr:ZnSe
Cr:ZnSe laser crystals offer several advantages: generally no excited-state absorption or upconversion, an extremely broad absorption band, a large emission cross section, excellent fluorescence quantum efficiency at room temperature, an ultrabroad emission bandwidth, and good chemical and mechanical properties. These characteristics make them excellent gain sources for efficient, powerful tunable mid-infrared lasers. Because the mid-infrared band is an atmospheric transmission window, Cr:ZnSe laser crystals have important application prospects in optical communication, pollutant-gas detection and industrial combustion-product testing.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Crystal Structure | Cubic |
| Poisson's ratio | 0.28 |
| Thickness / Diameter Tolerance | ±0.05mm |
| Orientation tolerance | < 0.5° |
| Surface Flatness [@632nm] | <λ/8@632nm |
| Wavefront distortion [@632nm] | <λ/4@632nm |
| Surface Quality | 10-5(MIL-O-13830A) |
| Parallelism | 30〞 |
| Perpendicularity | 15ˊ |
| Clear Aperture Dimension | >90% |
| Chamfer | <0.2×45° |
| Melting point | 1520 ºC |
| Coefficient of thermal expansion [@20ºC] | 1.5×10⁻⁶/ºC |
| Thermal conductivity [@20ºC] | 14 W/m/ºK |
| Specific heat | 0.79 J/g K |
| Density | 5.27 g/cm³ |
| Durability: Knoop hardness | 112 kgf/mm² |
| Mohs hardness | 8.5 |
| Young's modulus | 67 GPa |
| Modulus of rupture | 55 MPa |
| Orientation | <111>or <100> |
| Laser Wavelength | 2150 – 2600 nm |
| Emission linewidth | <1 nm |
| Intrinsic loss [@1064nm] | <0.003 cm⁻¹ |
| Refractive Index n [@1650nm] | 2.455 |
| Thermo-optic coefficient dn / dT [@nm] | 61×10⁻⁶/ºC |
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