Cross-phase modulation between two intense orthogonally polarized laser beams copropagating through a Kerr-like medium

J. A. Marozas

doi:10.1117/12.354159

23 July 1999 Cross-phase modulation between two intense orthogonally polarized laser beams copropagating through a Kerr-like medium

J. A. Marozas

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Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354159
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

The Laboratory for Laser Energetics plans to install KDP wedges on each beam line of the OMEGA laser system in order to split each beam into two orthogonally polarized beams propagating gin slightly different directions. The wedges improve the on-target laser uniformity by decreasing the instantaneous speckle through spatial averaging of the two orthogonal beams. The proposed wedge-finishing method - diamond turning - procedures small residual scratch marks, causing each beam to acquire a pseudorandom phase perturbation. In addition, the orthogonally polarized beams interfere such that their combined polarization state continuously cycles through all elliptical states along any transverse plane. Since the nonlinear refractive index depends on the polarization state, intense beams accumulate a periodic phase perturbation that is greatest for linear polarization. Propagation of both types of phase perturbation yields an intensity modulation that tens to be larger in the neighborhood of linear polarization, through a combination of diffraction and self- and cross-phase modulation. However, 1D and 2D calculations demonstrate that diamond-turned KDP wedges are not a significant source of intensity modulation under OMEGA laser conditions. Installation of diamond-turned rather than polished wedges will reduce costs without adversely impacting the system performance.

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J. A. Marozas "Cross-phase modulation between two intense orthogonally polarized laser beams copropagating through a Kerr-like medium", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354159

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KEYWORDS

Polarization

Modulation

Diffraction

Refractive index

Crystals

Phase shift keying

Beam splitters

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