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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CTuJ4

Compression of Nd:YAG laser pulses during second-harmonic generation

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Abstract

Second-harmonic (SH) generation in the presence of group-velocity mismatch and strong energy exchanges can lead to effective pulse compression.1,2 This technique led to a 4-5-fold compression of subpicosecond pulses.3,4 The motivation for our research is to extend this method to the compression of picosecond pulses directly generated by a laser, down to the femtosecond scale. The basic approach is to compensate with optical delays for the difference in group velocity of the two orthogonal components of the fundamental in a type-II second-harmonic-generation (SHG) geometry. Reconversion back to the fundamental also contributes to the compression. The advance given to the ordinary wave, the crystal length, the pulse duration, and the intensity are all parameters that have to be accurately matched.

© 1995 Optical Society of America

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