Abstract
Ultrafast coherent optical signal processing is required for such uses as the determination of the time-resolved energy profile of low power subpicosecond near IR laser sources (soliton laser, mode-locked semiconductor lasers). Highly nonlinear molecular organic crystals such as POM1 (3-methyl-4-nitropyridine-1 -oxide) or NPP [4-nitrophenyl-(L)-prolinol]2 have recently been shown to combine unique features in terms of transparency and efficiency features which qualify them for autocorrelation and cross-correlation measurements or parametric amplification and sampling spectroscopy (PASS).3 A time response as fast as 20 fs has been recently reported4 for POM in the parametric regime in the 1.5-1.7-μm bandwidth. This new domain of applications requires the extension of the analysis of three-wave mixing configurations beyond conventional phase(velocity) matching considerations.
© 1990 Optical Society of America
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