Walk-off-compensated type-I and type-II SHG using twin-crystal AgGaSe2 and KTiOPO4 devices

Jean Jacques Zondy, M. Abed, S. Khodja, C. Bonnin, B. Rainaud, Herve Albrecht, Dominique Lupinski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Citations (Scopus)


The walkoff-compensated (WOC) twin-crystal device enables to reduce the aperture effects in critically phase-matched parametric generation. In that device, instead of using a monolithic bulk crystal of length 21 c, two identically-cut crystals of length l c are disposed in tandem such that the relative sign of the walkoff angle ρ in the first and second items are opposite, while keeping unchanged the relative sign of their non-linear effective susceptibilities through a proper orientation of their optic axes. Applied to KTiOPO 4 (KTP) for type-II (oeo) second-harmonic generation (SHG) of a color center laser, the 2 × l c twin- crystal device leads to a conversion efficiency 3.5 times higher than that of a 21c single bulk crystal. The same WOC technique has been applied successfully in the type-I (ooe) SHG of a CO 2 laser using an AgGaSe 2 (AGSE) device. The extension of the WOC method to a periodical structure composed of N twin-device stacks is considered. We report the first demonstration of the SHG efficiency enhancement of such a structure, which is made of four KTP plate optically contacted in the WOC configuration.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsMool C. Gupta, William J. Kozlovsky, David C. MacPherson
Number of pages7
Publication statusPublished - Jan 1 1996
Externally publishedYes
EventNonlinear Frequency Generation and Conversion - San Jose, CA, USA
Duration: Jan 29 1996Jan 31 1996

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering


OtherNonlinear Frequency Generation and Conversion
CitySan Jose, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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