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14 April 2008 Nonlinear optical device for middle infrared generation
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An alternative to Quasi Phase Matching (QPM), called Semi Quasi Phase Matching (SQPM) is proposed, wherein the segments of crystals with inverted axis are substituted by segments of small polycrystal grains of the same material. These segments produce negligible nonlinear interaction, while still providing the π phase change necessary. A SQPM device of length L should produce the same nonlinear output as a QPM device of length L/2. Crystals with higher nonlinear coefficients and larger transparency ranges like III-V and II-VI compounds, not normally amenable to inversion of axes, can be used. This is especially important for doubling of CO2 laser lines.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Navin B. Patel "Nonlinear optical device for middle infrared generation", Proc. SPIE 6952, Laser Source Technology for Defense and Security IV, 69520T (14 April 2008);

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