Distortion correction by phase conjugation using four-wave mixing

Hans Hermann Klingenberg; Thomas Hall; Wolfgang Riede

doi:10.1117/12.238052

11 April 1996 Distortion correction by phase conjugation using four-wave mixing

Hans Hermann Klingenberg, Thomas Hall, Wolfgang Riede

Proceedings Volume 2771, Laser Optics '95: Phase Conjugation and Adaptive Optics; (1996) https://doi.org/10.1117/12.238052
Event: Laser Optics '95, 1995, St. Petersburg, Russian Federation

Abstract

Pulsed energy deposition into a high power carbon-dioxide gas discharge as well as high pump energy deposition into a solid-state laser material results in a distortion of the transverse mode profile of the laser beam. In the first case the transverse field distribution is influenced by the laser induced medium perturbation and shock waves due to the inhomogeneous energy deposition into the amplifying medium. For the second case the known thermal lensing problems occur in optically pumped systems, flashlamp- and diode-pumped, respectively, under various pump power levels. The technique successfully applied in both cases for correcting the distorted phases is by means of phase conjugation. Through numerical simulations using the Fresnel-Kirchhoff diffraction theory by including the relevant beam distorting effects for the individual laser a restoration of the beam quality was found when a phase conjugate mirror (PM) was installed. These findings agree well with experimental results.

Citation Download Citation

Hans Hermann Klingenberg, Thomas Hall, and Wolfgang Riede "Distortion correction by phase conjugation using four-wave mixing", Proc. SPIE 2771, Laser Optics '95: Phase Conjugation and Adaptive Optics, (11 April 1996); https://doi.org/10.1117/12.238052

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