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

doi:10.1117/12.239694

10 May 1996 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

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239694
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

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 (rho) 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 KTiOPO₄ (KTP) for type-II (oeo) second-harmonic generation (SHG) of a color center laser, the 2 X 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 CO₂ laser using an AgGaSe₂ (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.

Citation Download Citation

Jean-Jacques Zondy, M. Abed, S. Khodja, C. Bonnin, B. Rainaud, Herve Albrecht, and Dominique Lupinski "Walk-off-compensated type-I and type-II SHG using twin-crystal AgGaSe₂ and KTiOPO₄ devices", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239694

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