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Zinc-Germanium
Diphosphide (ZnGeP2, ZGP) single crystals are the highly-effective
non-linear optical material for the middle IR, as well as terahertz
range. ZnGeP2 crystals have positive birefringence which
allows one to carry out the phasematched parametric frequency conversion
of optical radiation in all the ranges of their background transparency
spectrum from 0.75 to 12.0 µm.
Its useful transmission range lies from 2.1 to 10.6 µm with absoprtion
of lower than 0.04 cm-1. ZnGeP2 has the largest non-linear optical coefficient
and a relatively high laser damage threshold. It was successfully used
in the following applications: up-conversion of CO2 laser light to near
IR range(1) via mixing with 1.06 mm; sum frequency generation of CO
and CO2 laser radiation; efficient SHG of pulsed CO, CO2 (49% efficiency
at 1 GW/cm2 intensity of 2 ns pulses, 9.52 mm wavelength) and chemical
DF-laser, OPO light generation in mid infrared when pumped by erbium
and holmium lasers.
APPLICATIONS of ZGP:
| • Second,
third, and fourth harmonic generation of CO2-laser |
• Optical
parametric generation with pumping at a wavelength of 2.0 µm |
| • Second
harmonic generation of CO-laser |
• Producing
coherent radiation in submillimeterrange from 70.0 µm to 1000
µm - Terahertz range |
• Generation
of combined frequencies of CO2- and CO-lasers radiation and
other lasers are working in the crystal transparency region.
Literature:
| •
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F. Rotermund,
V. Petrov, F. Noack and P. Schunemann. Characterization of ZnGeP2
for parametric generation with near-infrared femtosecond pumping.
Fiber and Integrated Optics 20 (2001) 139-50 |
| •
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G.A.Verozubova,
A.I.Gribenyukov, V.V.Korotkova, O.Semchinova, D.Uffmann. Synthesis
and growth of ZnGeP2 crystals for nonlinear optical
applications. Journal of Crystal Growth (2000) Vol 213, 3-4, 334-339
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| •
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Madarasz,
F. L., J. O. Dimmock, N. Deitz, and K. J. Bachmann, Sellmeier
parameters for ZnGeP2 and GaP, J. Appl. Physics, 87,
1564-1565 (2000) |
| •
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V. Petrov,
F. Rotermund, F. Noack and P. Schunemann. Femtosecond parametric
generation in ZnGeP2. Opt. Lett. 24 (1999) 414-6 |
| •
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V. Petrov,
Y. Tanaka and T. Suzuki. Parametric generation of 1-ps between
5 and 11 µm with a ZnGeP2 crystal. IEEE J. Quantum
Elect. QE-33 (1997) 1749-55 |
| •
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K. Stoll,
J.-J. Zondy, O. Acef. Fourth-harmonic generationof a continuous-wave
CO2 laser by use of an AgGaSe2/ZnGeP2 doubly
resonant device. Optics Letters, 1997, Volume 22, Issue 17, 1302-1304 |
| •
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K. L. Vodopyanov.
Parametric generation of tunable infrared radiation in ZnGeP2
and GaSe pumped at 3 µm. JOSA B, 1993, 10, 9, 1723 |
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MAIN
PROPERTIES:
| Transparency
range, µm |
0.75
- 12.0 |
| Point
group |
42m |
| Density,
g/cm3 |
4.12 |
| Mohs
hardness |
5.5 |
| Refractive
indexes: |
|
| at 2.00
µm |
no
= 3.1490; ne = 3.1889 |
| at 4.00
µm |
no
= 3.1223; ne = 3.1608 |
| at 6.00
µm |
no
= 3.1101; ne = 3.1480 |
| at 8.00
µm |
no
= 3.0961; ne = 3.1350 |
| at 10.00
µm |
no
= 3.0788; ne = 3.1183 |
| at 12.00
µm |
no
= 3.0552; ne = 3.0949 |
| Non-linear
coefficient, pm/V |
d36
= 68.9 (at 10.6 µm), d36 = 75.0 (at 9.6 µm) |
| Optical
damage threshold, MW/cm2 |
60 (at
10.6 µm, 150 ns) |
We supply ZnGeP2
(ZGP) optical elements made according to customers' order.
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