CdSe crystals
Main features
- Wide transparency range (0,7-24 µm)
- Reasonably large nonlinearity
- Small walk-off angle
Application examples
- Far infrared wavelength radiation generation by DFG, OPO schemes
- Material for infrared optical elements: substrates, polarizers, waveplates, etc.
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- Description
- Properties
Cadmium selenide (CdSe) crystals feature an infrared transmission up to 24 µm, reasonably large nonlinearity and small walk-off angle. CdSe crystals can be employed into difference frequency generation (DFG), optical parametric oscillation (OPO) schemes to generate infrared laser radiation above ZGP absorption edge (>12 µm). For instance, CdSe OPO can potentially be pumped by 2 µm Tm-doped, Ho-doped, Tm and Ho co-doped lasers and produce far infrared idler radiation. Besides nonlinear optic applications cadmium selenide crystal material can be used for IR optical elements: substrates, polarizers, waveplates, etc.
| Physical and optical properties | |
|---|---|
| Chemical formula | CdSe |
| Crystal structure | Hexagonal, 6mm |
| Lattice parameters | a = 4,2985 Å, c = 7,0150 Å |
| Optical symmetry | Positive uniaxial (ne > no) |
| Density @288 K | 5,81 g/cm3 |
| Mohs hardness | 3,25 |
| Transparency range | 0,7-24 µm @“0” transmittance level) |
| Dispersion equations @T = 293 K (λ in µm) | no2 = 4,2243 + 1,7680 λ2/(λ2 - 0,2270) + 3,1200 λ2/ (λ2 - 3380); ne2 = 4,2009 + 1,8875 λ2/(λ2 - 0,2171) + 3,6461 λ2/ (λ2 - 3629) |
| Refractive indices | no = 2,431, ne = 2,452 |
| Thermal conductivity @T = 293 K | 6,9 (||c) Wm-1K-1, 6,2 (⊥c) Wm-1K-1 |
| Laser induced damage threshold | 60 MW/cm2@10,6 μm, 200 ns |
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