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Nonlinear optical crystals can convert the wavelength of laser diode from infrared to green or blue. To achieve higher conversion efficiency, wave conversion devices using nonlinear crystals have to satisfy the phase matching condition. Generally the phase matching angle acceptance of nonlinear crystals is so narrow that it is very difficult to achieve the theoretical conversion efficiency. This paper investigates the theoretical angle acceptance of few kinds of organic nonlinear optical crystals. The narrowest angle acceptance was 0.0055°(λ=1064nm, L=10mm, power ratio 99%) of Chalcone TC-28. To satisfy the phase matching angle acceptance, a new optical surface generator which can determine the optimum crystal orientation to get the highest wave conversion efficiency was also proposed.

Specifications of an Optical Surface Generator for Nonlinear Optical Crystals of Narrow Phase Matching Angle Acceptance.