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Proceedings Paper

Far-infrared spectra of nonlinear optical crystals
Author(s): Gregory S. Herman; Gianluigi Bertelli
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Paper Abstract

Far-infrared (FIR) transmission spectra have been measured for several nonlinear crystals. The results show that both GaP and ZnGeP2 have a fairly narrow Restrahlen band. After the Mid-infrared (MIR) cut off at wavelengths near 12 micrometers, the crystals begin transmitting again at wavelengths of 100 micrometers. The transmissivity is highly dependent on the conductivity of the samples as free carrier absorption will deleteriously affect transmission. These results indicate that these crystals may be used for generation of FIR radiation using difference frequency generation (DFG) from the Near-Infrared (NIR) or MIR. High resistivity GaAs and GaSe should have similar properties, but no high resistivity material was found. Other crystals such as LiNbO3, LiIO3, BBO and KTP may be used at longer wavelengths.

Paper Details

Date Published: 10 April 1995
PDF: 7 pages
Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); doi: 10.1117/12.206501
Show Author Affiliations
Gregory S. Herman, Univ. of Arizona, Science Applications International Corp., and NASA Langley Research Ctr. (United States)
Gianluigi Bertelli, Old Dominion Univ. and NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 2379:
Solid State Lasers and Nonlinear Crystals
Gregory J. Quarles; Leon Esterowitz; Lap Kin Cheng, Editor(s)

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