Parametric Processes In Molecular Crystals At Picosecond And Femtosecond Timescales.

J. Zyss; I. Ledoux; D. Hulin; A. Migus

doi:10.1117/12.960591

25 September 1989 Parametric Processes In Molecular Crystals At Picosecond And Femtosecond Timescales.

J. Zyss, I. Ledoux, D. Hulin, A. Migus

Proceedings Volume 1104, Growth, Characterization, and Applications of Laser Host and Nonlinear Crystals; (1989) https://doi.org/10.1117/12.960591
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

A brief introduction to quadratic nonlinear molecular crystals outlines the basic features of a molecular engineering approach which has lead to the design of such materials as MAP, POM, NPAN and NPP. Phase-matching configurations for subpicosecond second-harmonic generation or degenerated parametric mixing must be compatible with group-velocity matching requirements. We show that spectrally non-critical phase-matching where the wavelength dispersion of the phase-matching angle is stationnary meets this condition at the expense of the angular aperture. Efficient type I second-harmonic generation at 1.32 and 1.34 μm fundamental wavelength in high quality POM crystals in the subnanosecond regime is reported. The eigenpolarization angles at these wavelength happen to maximize the effective d coefficient at the full d₁₄ coefficient value (i.e. 20 10^-9 e.s.u.). Subpicosecond time-resolution of parametric emission in NPP is achieved by a two stage Parametric Amplification and Sampling Spectroscopic (PASS) set-up. The temporal profiles of idler and signal waves are clearly and simultaneously analized at significant departures from degeneracy (up to 1500 cm^-1). This confirms the broadband acceptance of NPP and its relevance towards future ultrafast signal processing operations.

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J. Zyss, I. Ledoux, D. Hulin, and A. Migus "Parametric Processes In Molecular Crystals At Picosecond And Femtosecond Timescales.", Proc. SPIE 1104, Growth, Characterization, and Applications of Laser Host and Nonlinear Crystals, (25 September 1989); https://doi.org/10.1117/12.960591

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KEYWORDS

Crystals

Nonlinear crystals

Laser crystals

Laser applications

Phase matching

Picosecond phenomena

Infrared radiation

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