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Recent topics on the engineering for solid-state peak-power lasers in repetitive operation
Masahiro Nakatsuka,Hidetsugu Yoshida,Hisanori Fujita,Kana Fujioka,Yasushi Fujimoto,Yasushi Fujimoto 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42
Solid-state lasers have been developed for peak-power operation in the terawatt to petawatt regions by using chirped pulse amplication (CPA) and optical parametric (OPCPA) technology. Also thermal distortion-free, 10-nsec repetitive peak-power lasers have been developed. Broadband amplication of a solid-state laser is a key issue for the pre-amplication stage of CPA system, and the OPA scheme gives a high gain with a very low pre-pulse level while keeping a 5-nm bandwidth. On the other hand, nonlinear optical technology using stimulated Brillouin scattering (SBS) is promising as a way to compensate for thermal diculties caused in strongly pumped laser materials. SBS is well known for the phase conjugation mirror (PCM) used for an average power output with a high re ectivity of over 95 %. A liquid uorocarbon with a special treatment can be used to achieve a 10-ns duration, 50-Hz repetition laser delivering 0.4-GW peak power, with a 200-W average power. A liquid ow system in an SBS cell can be used to realize PCM behavior up to the kW range. The last theme in this paper is a short review of new ceramic materials for a scalable solid-state laser. In past ten years, Japanese researchers have investigated new transparent ceramic YAG materials for industrial application. The ceramics have many advantages for an average power laser, such as high doping rate, co-doping potential, large-size fabrication, and composite structure.
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