Beam pattern and filling factor improvement for a Cassegrain three-pass amplifier using a new shape of optimized serrated apertures

Thierry Bontoux; Taku Saiki; Tadashi Kanabe; Hisanori Fujita; Masahiro Nakatsuka

doi:10.1117/12.294287

8 December 1997 Beam pattern and filling factor improvement for a Cassegrain three-pass amplifier using a new shape of optimized serrated apertures

Thierry Bontoux, Taku Saiki, Tadashi Kanabe, Hisanori Fujita, Masahiro Nakatsuka

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Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294287
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

The upgrade of the actual large laser facilities (GEKKO XII in our case) implies an increase of filling factor avoiding generation of high spatial-frequencies. To reach that purpose we intend to construct the beam using serrated aperture with optimized shape. The performances of our system lead after simulation to 70% filling factor with less than 2% fluctuation on laser pattern intensity map. As only a very few articles were written on that subject although it is not very new, this paper includes a theoretical approach of the serration effects. It presents mainly results from simulation and some experimental data.

Citation Download Citation

Thierry Bontoux, Taku Saiki, Tadashi Kanabe, Hisanori Fujita, and Masahiro Nakatsuka "Beam pattern and filling factor improvement for a Cassegrain three-pass amplifier using a new shape of optimized serrated apertures", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294287

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KEYWORDS

Beam shaping

Amplifiers

Spatial filters

Diffraction

Mirrors

Photography

Convolution

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