It is shown that the combination of pulse-front slant, kappa -vector tilt, and crystal birefringence often permits exact matching of both phase and group velocities for three-wave mixing in birefringent crystals. This exact match makes possible more-efficient mixing of short light pulses, and it permits efficient mixing of chirped or broadband light. I analyze this process and present examples.
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Arlee V. Smith (2001) studied this question.
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