Abstract
We have recently reported1 the generation of ~10-fs duration 315-nm wavelength pulses by frequency doubling of ~14-fs pulses, derived from a CPM laser, in a poled copolymer film of 2.2-μm thickness. The group velocity mismatch (GVM), which broadens the frequency doubled pulses, was negligible that allows the doubling of even shorter pulses. The measured conversion efficiency (0.025%) was good for such a thin film, owing to the high value of the non-linear coefficient and to the remarkably high (~160 GW/cm2) damage threshold. To increase the conversion efficiency, the interaction length, which in the reported work1 was limited by the phase mismatch, should be increased. Since conventional methods of phase-matching are not possible in poled organic films, other methods must be used. We report here the results of theoretical and experimental investigation of femtosecond second harmonic generation (FSHG) in both anomalously-phase-matched and quasi-phase-matched (QPM) structures.
© 1994 Optical Society of America
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