CdSe crystals
Main features
- Wide transparency range (0,7 - 24 μm)
- Reasonably large nonlinearity (d31 = 18 pm/V)
- Small walk-off angle
Application examples
- Long-infrared wavelength infrared 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 infrared transmission up to 24 μm, reasonably large nonlinearity (d31 = 18 pm/V) and small walkoff angle. CdSe crystals can be employed into difference frequency generation (DFG), optical parametric oscillation (OPO) schemes to provide infrared laser radiation above ZGP absorption edge (>12 μm). For instance, CdSe OPO potentially can be pumped by 2 μm Tm-doped, Ho-doped, Tm and Ho-codoped lasers and produce long infrared idler radiation. Besides nonlinear optics 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" transmittance level | 0,7 - 24 μm |
| Sellmeier 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 @10,0 μm | 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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