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Proceedings Paper

Traveling wave mid-IR ZnGeP2 and GaSe optical parametric generators and their spectroscopic applications
Author(s): Konstantin L. Vodopyanov; Christopher C. Phillips
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Paper Abstract

Mode-locked Er:Cr:YSGG laser ((lambda) equals 2.8 micrometers ) pulses with 100 ps duration were used to pump travelling wave optical parametric generators (OPG) based on ZnGeP2 and GaSe crystals. In the ZnGeP2 a tuning range 3.9-10 micrometers was achieved in both cases of type I and II synchronism, OPG pump threshold being only 0.25 GW/cm2 for 11 mm long crystal, the smallest reported value for travelling wave OPG. Type II synchronism was characterized by OPG linewidth of 30-40 cm-1, and conversion efficiency up to 18% corresponding to MW peak power; type I had broader linewidth, especially near degeneracy point. In a double- pass scheme OPG had almost diffraction-limited divergence which allowed to focus radiation into a 20(lambda) diameter spot. In case of GaSe crystal the tuning range was larger: 3.5-18 micrometers , but at the expense of higher pumping threshold-4 GW/cm2 for a 10 mm long GaSe crystal; quantum efficiency being 1-2%. Results concerning nonlinear spectroscopy of InSb at room temperature and GaAs/AlGaAs multi-quantum wells near (lambda) equals 9 micrometers , with focussed OPG beam intensities of 104- 108 W/cm2 will be also presented.

Paper Details

Date Published: 10 April 1995
PDF: 5 pages
Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); doi: 10.1117/12.206467
Show Author Affiliations
Konstantin L. Vodopyanov, Imperial College of Science, Technology and Medicine (United Kingdom)
Christopher C. Phillips, Imperial College of Science, Technology and Medicine (United Kingdom)

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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