Type I and II ZnGeP sub(2) travelling-wave optical parametric generator tunable between 3.9 and 10 mu m

Mode-locked Er:Cr:YSGG laser ( lambda identical with 2.8 mu m) pulses were used to pump travelling wave optical parametric generator (OPG) based on a ZnGeP sub(2) crystal. Using the new crystal's orientation and type II synchronism, the tuning range was extended to lambda identical with 10 mu m...

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Bibliographic Details
Published in:Optics communications 1995-01, Vol.117 (3-4), p.277-282
Main Authors: Vodopyanov, K L, Voevodin, V G
Format: Article
Language:English
Online Access:Get full text
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Summary:Mode-locked Er:Cr:YSGG laser ( lambda identical with 2.8 mu m) pulses were used to pump travelling wave optical parametric generator (OPG) based on a ZnGeP sub(2) crystal. Using the new crystal's orientation and type II synchronism, the tuning range was extended to lambda identical with 10 mu m, crystal's longwave transmission limit, thus making it possible to cover the whole 3.9-10 mu m range (except for a gap of 5.3-5.9 mu m) with only two crystals of different orientations. For a 40 mm long crystal the OPG pump threshold was found to be 0.09 GW/cm super(2) - the smallest reported value for travelling wave OPGs. In the case of type I interaction, where continuous 3.9-10 mu m tunability was attained, the linewidth was found to be much broader than in type II. In particular, near degeneracy point, infrared picosecond continuum with lambda identical with 4.5-8 mu m was generated. It was shown that in type I phase matching non-collinear interaction plays a significant role.
ISSN:0030-4018