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Arminas Butkus +370 5 219 4884
ZnGeP2 crystals
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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
Request custom
  • 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/
2 - 832,75);

ne2 = 12,1438 + 0,75255/(λ2 - 0,21913) + 2061,68/
2 - 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
Order your item
Face dimensions Length Theta Phi Coatings Application SKU PRICE QUANTITY
5x5 mm
10 mm
55,3°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15358
Request
5x5 mm
15 mm
55,3°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15359
Request
5x5 mm
20 mm
55,3°
AR@2,1 μm + BBAR@3,5-5 μm
MWIR generation, type I, eeo interaction
15360
Request