Abstract
Sum-frequency generation of femtosecond pulses by noncollinear phase matching in a micro-structured beta-BaB(2)O(4) crystal has been investigated. A 1D relief grating was recorded in the surface of a beta-BaB(2)O(4) crystal by direct irradiation with femtosecond pulses. Groove dimensions of 1 mum width and 200 nm depth were obtained for the recording parameters. This micro-structured crystal was used for generating ultraviolet pulses (265 nm) by noncollinear sum-frequency generation of the fundamental and the second harmonic of a Ti:Sapphire femtosecond laser system. Effective group-velocity matching between the incident pulses can be achieved for certain noncollinear processes in a compact way. The application of such device to intensity cross-correlation measurements of the second-harmonic pulse was shown.
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