Paper
8 December 1997 Smoothing of focused-beam pattern using two-dimensional spectral dispersion performed at GEKKO XII
Noriaki Miyanaga, Shinichi Matsuoka, Jin-Hun Park, Kouji Tsubakimoto, Masahiro Nakatsuka, Akihiro Morimoto, Tetsuro Kobayashi
Author Affiliations +
Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294252
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France
Abstract
The laser irradiation uniformity on the target surface has been improved using a 2D scheme of the smoothing by spectral dispersion. The laser beam was dispersed in both orthogonal directions by installing the series of pair of phase modulator and diffraction gratings. A polarization- preserving single mode fiber was utilized as the first phase modulator by which the modulation frequency and depth are easily controlled by using the cross-phase modulation. The second phase modulator was a quasi-velocity matched LiTaO3 modulator driven by 9.4-GHz microwave. Using these modulators, the combination of modulation frequencies was varied in a range from 5/9.4 GHz to 14/9.4 GHz. The advanced phase modulation was obtained by adopting the self-phase modulation in conjunction with the cross-phase modulation in the optical fiber. It has been confirmed that the temporally changing modulation frequency (the chirped phase modulation) is favorable for better smoothing in comparison with the ordinary scheme with fixed modulation frequencies.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Noriaki Miyanaga, Shinichi Matsuoka, Jin-Hun Park, Kouji Tsubakimoto, Masahiro Nakatsuka, Akihiro Morimoto, and Tetsuro Kobayashi "Smoothing of focused-beam pattern using two-dimensional spectral dispersion performed at GEKKO XII", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294252
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KEYWORDS
Modulation

Modulators

Phase shift keying

Phase modulation

Crystals

Optical fibers

Spherical lenses

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