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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CTuJ6

Polarization rotation in the harmonic generation of ultraintense laser pulses

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Abstract

Harmonic generation has been used to extend the available wavelength range and improve the contrast of the intensity of high-power ultrafast lasers. High-order nonlinear processes are also important in advanced laser systems, such as OPAs and in fiber optics. In this experiment, we demonstrate that in the case of a high-intensity laser interaction with a nonlinear medium, the intensity-dependent refractive index leads to a self-induced change in the polarization rotation. Although this effect does not interfere with second-harmonic generation (SHG), which was observed to be 50-75% at intensities up to several hundred gigawatts per square centimeter,1 the efficiency of third-harmonic-generation (THG) can be significantly affected.

© 1995 Optical Society of America

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