Partially coherent light sources for ICF experiment

Masahiro Nakatsuka; Noriaki Miyanaga; Tadashi Kanabe; Hirohiko Nakano; Kouji Tsubakimoto; Sadao Nakai

doi:10.1117/12.154482

1 May 1993 Partially coherent light sources for ICF experiment

Masahiro Nakatsuka, Noriaki Miyanaga, Tadashi Kanabe, Hirohiko Nakano, Kouji Tsubakimoto, Sadao Nakai

Proceedings Volume 1870, Laser Coherence Control: Technology and Applications; (1993) https://doi.org/10.1117/12.154482
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

In this paper we report the characteristics of the partially coherent light sources used in the high-power Nd-phosphate glass laser system, Gekko XII. One is an amplified spontaneous emission (ASE) from Nd:glass rod and the other is a spatial mode mixing by an optical multimode fiber of a frequency chirped and pulse compressed laser light. We also introduced the angular dispersion of spectrum (AD) with a large beam divergence which is very effective for the beam smoothing without sacrificing harmonic conversion efficiency. The effect of AD gave an additional spatial and also temporal speckle smoothing at a farfield due to movement of the interference pattern. The measured temporal evolution of the speckle structure showed the rapid smoothing of the speckle with a larger beam divergence. The focused beam patterns at a target surface at Gekko XII were measured at the equivalent target plane by changing the beam divergence. A statistical model is applied for analyzing the speckle pattern in order to treat a beam smoothing effect.

Citation Download Citation

Masahiro Nakatsuka, Noriaki Miyanaga, Tadashi Kanabe, Hirohiko Nakano, Kouji Tsubakimoto, and Sadao Nakai "Partially coherent light sources for ICF experiment", Proc. SPIE 1870, Laser Coherence Control: Technology and Applications, (1 May 1993); https://doi.org/10.1117/12.154482

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