ZnGeP2 (ZGP) crystals have large nonlinear coefficients (d36=75pm/V), wide infrared transparency range(0.75-12μm), high thermal conductivity(0.35W/(cm·K), high laser damage threshold (2-5J/cm2)and well machining property. ZnGeP2 crystal was called the king of infrared nonlinear optical crystals and is still the best frequency conversion material for high power, tunable infrared laser generation.
Main features:
♦ Large nonlinear coefficients (d36=75pm/V)
♦ Wide infrared transparency range(0.75-12μm)
♦ High thermal conductivity(0.35W/(cm·K)
♦ High laser damage threshold (2-5J/cm2)
♦ Well machining
Typical applications:
♦ Second, third, and fourth harmonic generation of CO2-laser
♦ Optical parametric generation with pumping at a wavelength of 2.0 µm
♦ Producing coherent radiation in submillimeterrange from 70.0 µm to 1000 µm
♦ Generation of combined frequencies of CO2- and CO-lasers radiat ion and other lasers are working in the crystal transparency region
Transmission curve of ZGP
Technical Parameters
| Argument Name | Value and Range |
Length tolerance | ±0.5mm(length>10mm) ±0.1mm(10mm>length>1mm) |
Surface quality | 20/10 |
Aperture tolerance | ±0.1mm |
Flatness | PV< λ/4@632.8 nm |
Parallelism | < 30 arc sec |
Perpendicularity | < 5 arc min |
Transparency range | 0.75 - 12.0um |
Quality warranty period | 1 year (with normal use) |
Crystal Structure and Physical Properties
| Argument Name | Value and Range |
Crystal structure | Tetragonal, -42m |
Crystal parameters | a=5.467 Å , c=12.736 Å |
Mohs hardness | 5.5 |
Density | 4.162 g/cm3 |
Thermal conductivity @ T= 293 | 35 W/m·K (⊥c)36 W/m·K( ∥c) |
Thermal Expansion@ T = 293 K to | 17.5 x 106 K-1 (⊥c)15.9x106K-1(∥c) |
 |
Download as PDF |
