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SHARP Report Summary

Project ID: HPRI-CT-2001-50037
Country: France

Double CPA XPW generation

A new kind of nonlinear filtering technique is studied, based on a based on cross-polarized wave generation in non linear centro-symmetric crystals.

Cross-polarized wave (XPW) is generated by four wave mixing governed by the anisotropy of the third order nonlinearity. We have selected this process because of the perfect group velocity matching. We used both BaF2 and YVO4 0.9mm long crystals.

A full description of this process applied to cubic and tetragonal crystals has been previously detailed (N. Minkovski, G. I. Petrov, S. M. Saltiel, O. Albert and J. Etchepare, J. Opt. Soc. Am. B, vol. 21, p. 1659 (2004)).

The contrast enhancement has been demonstrated to be only limited by the extinction ratio of the output polarizer (4.6dB in our case) by measuring the temporal profiles of the pulse before and after filtering with a third order cross correlator. A contrast improvement better than 4 orders of magnitude has been recorded. The energy converted from the femtosecond part of the main pulse to the XPW is about 10%.
These very promising results have been published in Opt. Lett., vol. 30, n°8, p. 920 (April 2005). Work is in progress by investigation of different non-linear crystals to increase XPW generation efficiency.

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