ZnGeP2 crystals
Main features
- Useful transmission range from 2 µm to 12 µm
- High nonlinearity
- Relatively high damage threshold
- Nominal absorption coefficient <0,04 cm-1 at ~2,1 µm for o-wave
Application examples
- Harmonic generation of CO2 and CO laser fundamental wavelength
- Generation of continuously tunable radiation in MWIR, LWIR range by OPO and DFG techniques
- Generation of terahertz range frequencies
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- Description
- Properties
- Specifications
Zinc-germanium diphosphide (ZnGeP2, ZGP) crystals are considered as state-of-the-art mid-IR nonlinear crystals due to unique properties. They exhibit an excellent nonlinearity and thermal conductivity (36 W/mK@||c, 35 W/mK@⊥c) together with a relatively high laser induced damage threshold. ZGP crystal can be successfully implemented in high-power mid-IR harmonic generators, difference frequency generators and optical parametric oscillators due its broad useful transmission range (2-12 µm).
Physical and optical properties | |
---|---|
Chemical formula | ZnGeP2 |
Crystal structure | Tetragonal, 42m |
Lattice parameters | a = 5,465 Å, c = 10,708 Å |
Optical symmetry | Positive uniaxial (ne>no) |
Density | 4,162 g/cm3 |
Mohs hardness | 5,5 |
Transparency range | 0,74 - 12 µm @“0“ transmittance level |
Dispersion equations @1,5-10,59 µm range, T = 293 K (λ in µm) | no2 = 11,6413 + 0,69363/(λ2 - 0,21967) + 1586,06/ (λ2 - 832,75); ne2 = 12,1438 + 0,75255/(λ2 - 0,21913) + 2061,68/ (λ2 - 951,07) |
Refractive indices | no = 3,0738, ne = 3,1137 @10,5 µm |
Thermal conductivity @T = 293 K | 36 (||c) Wm-1K-1, 35 (⊥c) Wm-1K-1 |
Laser induced damage threshold | 60 MW/cm2@10,6 μm, 100 ns |
ZGP crystals | |
---|---|
Orientation accuracy | <30 arcmin |
Clear aperture | >80% |
Face dimensions tolerance | +0,0/-0,2 mm |
Length tolerance | +1,0/-0,0 mm |
Parallelism error | <30 arcsec |
Perpendicularity error | <10 arcmin |
Protective chamfers | <0,2 mm at 45° |
Surface quality | 60-40 S-D |
Wavefront flatnesss | λ/4@632,8 nm |
Coatings | Antireflective coatings @2,1 μm + 3,5-5 μm on both sides |
Nominal absorption coefficient | ≤0,04 cm-1@2,1 μm, o-wave |
Mount | Unmounted |
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Face dimensions
Length
Theta
Phi
Coatings
Application
SKU
PRICE
QUANTITY
5x5 mm
10 mm
55,3°
0°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15358
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5x5 mm
15 mm
55,3°
0°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15359
Request
5x5 mm
20 mm
55,3°
0°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15360
Request
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