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2014-07-02

第3回レーザーピーニング国際学会(平成23年10月開催 @大阪)にて報告した以下の2件の研究内容が、
レーザー学会誌「レーザー研究」の平成26年6月号に掲載されました。

発表題目1:High Power Laser Developments with Femtosecond to Nanosecond Pulse Durations for Laser Shock Science and Engineering The Review of Laser Engineering, 42, pp.441-447(2014)

発表者:
Hiromitsu KIRIYAMA, Michiaki MORI, Masayuki SUZUKI, Izuru DAITO, Hajime OKADA, Yoshihiro OCHI, Momoko TANAKA, Masatoshi SATO, Yoshinori TAMAOKI, Takehiro YOSHII, Junya MAEDA, Shinichi MATSUOKA, Hirofumi KAN, Atushi KOSUGE. Hideyuki KOTAKI, Koichi,OGURA, Masaki KANDO, Kiminori KONDO, Keisuke NAGASHIMA, Akira SUGIYAMA, Sergei BULANOV, Atsushi YOKOYAMA, and Paul R. BOLTON

アブストラクト:
We describe three specific high power laser systems that are being developed in our laboratory for many applications in high field science,nonlinear optics and material processing. We report on a femtosecond petawatto-class Ti:sapphire chirped-pulse amplification laser system that can produce a pulse energy of 20 J of 40 fs pulse duration, a picosecond high intensity Yb:YAG chirped-pulse amplification laser system that can generate a pulse energy of 100 mJ of 0.5 ps pulse duration, and a nanosecond high repetition rate Nd:YAG laser system that can provide an average power of 360 W with a pulse duration of 30 ns delivered at a 1 kHz repetition rate. We discuss the basic design aspects and present the results from our experimental investigations of these laser systems.

発表題目2:
Generation of Temporal Low Noise Laser Pulses for Investigating of Laser Peening Process The Review of Laser Engineering, 42, pp.482-485(2014)

発表者:
Masayuki SUZUKI, Hiromitsu KIRIYAMA, Izuru DAITO, Hajime OKADA, Yoshihiro OCHI, Masatoshi SATO, Yoshinori TAMAOKI, Takehiro YOSHII, Junya MAEDA, Shinichi MATSUOKA, Hirofumi KAN, Paul R. BOLTON, Akira SUGIYAMA, and Kiminori KONDO

アブストラクト:
We have demonstrated an optical parametric chirped pulse amplification (OPCPA) / Yb:YAG ceramic thin disk hybrid laser system having the hundred mJ pulse energy level with sub-picosecond duration and high temporal contrast. At an input chirped-pulse energy of 3.8 mJ from an OPCPA preamplifer an output energy of 130 mJ has been generated from amultipass laser-diode (LD) pumped Yb:YAG ceramic thin disk amplifier. A recompressed pulse duration of 450 fs with a contrast level of less than 7.2 × 10-9 at 150 ps before the main pulse has been obtained. The contrast level was the highest value achieved in a Yb:YAG chirped pulse amplification (CPA) laser system at the hundred mJ level. This laser system is well-suited to studying laser matter interactions in the laser peening mechanism.

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