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Laser fusion driver using stimulated Brillouin scattering phase conjugate mirrors by a self-density modulation

Published online by Cambridge University Press:  19 June 2007

H.J. Kong
Affiliation:
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
J.W. Yoon
Affiliation:
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
D.H. Beak
Affiliation:
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
J.S. Shin
Affiliation:
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
S.K. Lee
Affiliation:
Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea
D.W. Lee
Affiliation:
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea

Abstract

A new concept of laser fusion driver is proposed, which uses a beam combination technique with stimulated Brillouin scattering phase conjugate mirror (SBS-PCM). It is constructed systematically with a cross-type amplifier as a basic unit. In the first part of this paper, we introduce the cross-type laser amplifier using SBS-PCM, with several advantages by experimental results. These advantages are the ideal properties for practical laser fusion driver, such as the perfect isolation of leak beam, the compensation of thermally induced birefringence through the amplifiers, the easy maintenance and alignment insensitiveness, and the freely-scale-up energy. Next, some successful results for the phase control of SBS-PCM are presented, which is one of the main problems in the current beam combination laser using SBS-PCM. Particularly, a new technique for controlling the phase of SBS-PCM, “self-density modulation,” is introduced, which is the simplest ever among those reported. With the advantages of the cross-type amplifier using SBS-PCM and the novel method for controlling the phase of SBS-PCM, the proposed beam combination laser system is presented as the most promising one, which can contribute to the realization of high energy laser that can operate with high repetition rate over 10 Hz, even in the case of huge output energy over MJ.

Type
Research Article
Copyright
© 2007 Cambridge University Press

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