パワーレーザーシステム⼯学（PLS）

グループの概要

核融合炉用レーザードライバーの開発とそこから派生する応用研究を中心に活動を展開しています。炉用ドライバーとして現在最も有力な候補は半導体レーザー(LD)励起の固体レーザーであり、これまでに高出力ガラスレーザー(HALNA, 10J@10Hz)や高効率ヤグレーザー(LD光→パルスレーザー光変換効率80%)を開発してきました。レーザー開発の基盤研究はレーザー材料やミラー、非線形材料などの光学材料・製膜の研究開発であり様々な角度から高耐力化・高機能化に取り組み、高エネルギー密度のレーザー実現を目指しています。

研究室HP

研究内容

1.Yb系固体レーザー

1.1 新規材料の評価 河仲
1.2 冷却Yb:YAG増幅器の高パルスエネルギー化 河仲、関根
1.3 冷却Yb:YAG増幅器の高平均出力化 時田、吉田
1.4 非線形材料の特性評価 安原、竹内

2.Nd系固体レーザー(HALNAの高性能化)

2.1 総括 川嶋、河仲
2.2 空間ビーム形状の向上 松本、安原
2.3 スラブ増幅器の温度分布の均一化 栗田
2.4 縦モードの安定制御 川嶋、関根

3.超高ピーク出力レーザー

3.1 非線形材料の高性能化と極短パルス発生 小川

2005年学術論文・国際会議発表

• 河仲準二、“低温冷却型Yb系固体レーザー”、レーザー研究　第33巻第4号、pp. 243-248 (2005).
• S. Tokita, J. Kawanaka, M. Fujita, T. Kawashima, and Y. Izawa, “Sapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers,” Appl. Phys. B vol. 80, pp. 635-638 (2005).
• J. Kawanaka, S. Tokita, H. Nishioka, M. Fujita, K. Yamakawa, K. Ueda and Y. Izawa, “Dramatically Improved Laser Characteristics of Diode-Pumped Yb-Doped Materials at Low Temperature,” Laser Physics 15, pp. 1306-1312 (2005).
• S. Tokita, J. Kawanaka, M. Fujita, T. Kawashima and Y. Izawa, “Efficient High-Average-Power Operation of Q-Switched Cryogenic Yb:YAG Laser Oscillator,” Jpn. J. Appl. Phys 44, L1529-L1531(2005).
• S. Tokita, J. Kawanaka, M Fujita, T. Kawashima and Y. Izawa, “Sapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers,” Advanced Solid-State Photonics (ASSP, OSA), MF44 (2005).
• J. Kawanaka, “New Concept of DPSSL – Tuning laser parameters by controlling temperature -,” 2005 US-Japan Workshop on Laser-IFE (General Atomics, San Diego, March 2005).
• T. Kurita, T. Kawashima, T. Ikegawa, O. Matsumoto, R. Yasuhara, T. Sekine, J. Kawanaka, N. Miyanaga, M. Nakatsuka, Y. Izawa, H. Kan, Y. Tsuchiya, H. Furukawa, T. Kanabe, “Thermally-Edge-Controlled Slab Laser for Inertial Fusion Energy and Applications,” Conference on Lasers and Electro-Optics (CLEO2005, OSA), CMJ5 (2005).
• J. Kawanaka, “A cryo-cooled ytterbium-doped laser materials for IFE driver −New concept of DPSSL-,” 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 2-1 (2005).
• T. Kawashima, J. Kawanaka, N. Miyanaga, M. Nakatsuka, Y. Izawa, O. Matsumoto, T. Kurita, R. Yasuhara, T. Ikegawa, T. Sekine, M. Miyamoto, K. Iyama, H. Kan, Y. Tuchiya, and H. Furukawa, “Recent progress of HALNA DPSSL driver development,” 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 1-2(2005).
• T. Kawashima, T. Ikegawa, H. Furukawa, R. Yasuhara, J. Kawanaka, and Y. Izawa, “Thermo-optical modeling for the HALNA slab amplifier,” 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 3-2 (2005).
• T. Kawashima and T. Kurita, “Design of optical pump delivery system for HALNA,” 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 5-2(2005).
• S. Tokita, J. Kawanaka, Y. Izawa, M. Fujita, and T. Kawashima, “Sapphire-cooling at both faces of high-power cryogenic Yb:YAG disk laser,” Conference on Lasers and Electro-Optics Europe 2005 (CLEO/Europe 2005, EPS/IEEE/OSA), CA2-2-MON (2005).
• J. Kawanaka, H. Nishioka, Y. Izawa, and K. Ueda, “Active-mirror oscillator with cryogenically cooled Yb-doped materials” Conference on Lasers and Electro-Optics Europe 2005 (CLEO/Europe 2005, EPS/IEEE/OSA), CA2-3-MON (2005).
• T. Kawashima, T. Kurita, O. Matsumoto, T. Ikegawa, T. Sekine, M. Miyamoto, K. iyama, H. Kan, Y. Tsuchiya, R. Yasuhara, J. Kawanaka, T. Norimatsu, N. Miyanaga, M. Nakatsuka, Y. Izawa, and H. Furukawa, “Diode-pumped, thermally-edge-controlled slab laser with high-energy and large-aperture,” Conference on Lasers and Electro-Optics Europe 2005 (CLEO/Europe 2005, EPS/IEEE/OSA), CA5-1-THU (2005).
• R. Yasuhara, T. Kawashima, T. Ikegawa, O. Matsumoto, T. Kurita, T. Sekine, M. Miyamoto, K. Iyama, Y. Tsuchiya, J. Kawanaka, T. Norimatsu, M. Nakatsuka, Y. Izawa, and H. Furukawa, “Diode-pumped thermally-controlled zig-zag slab laser with 20-J pulse energy in 10 ns at 10-Hz repetition rate,” Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-3.
• T. Sekine, R. Yasuhara, T. Kawashima, T. Ikegawa, O. Matsumoto, T. Kurita, Y. Tsuchiya, J. Kawanaka, T. Norimatsu, and Y. Izawa, “1-J at 10 Hz output diode-pumped Nd:YLF regenerative ring amplifier,” Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-4.
• T. Kurita, T. Kawashima, O. Matsumoto, R. Yasuhara, T. Ikegawa, T. Sekine, J. Kawanaka, N. Miyanaga, M. Nakatsuka, T. Norimatsu, Y. Izawa, H. Kan, H. Furukawa, and T. Kanabe, “8.4 J at 10 Hz laser operation of Nd:glass zig-zag slab amplifier pumped by 290 kW peak power diode array,” Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-5.
• J. Kawanaka, S. Tokita, H. Nishioka, M. Fujita, T. Kawashima, T. Yanagitani, K. Ueda, and Y. Izawa, “Cryogenically-cooled active-mirror oscillator with Yb-doped material for inertial fusion energy driver,” Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-6.
• O. Matsumoto, T. Kurita, T. Ikegawa, R. Yasuhara, T. Sekine, T. Kawashima, J. Kawanaka, T. Norimatsu, N. Miyanaga, Y. Izawa, M. Nakatsuka, M. Miyamoto, T. Kanzaki, H. Kan, H. Furukawa, and T. Kanabe, “Development of HALNA driver with thermally-edge-controlled slab amplifier module,” 14th International Laser Physics Workshop 2005 (Kyoto, July 2005), Seminor4.4.5.
• T. Kawashima, R. Yasuhara, J. Kawanaka, T. Norimatsu, M. Nakatsuka, Y. Izawa, T. Ikegawa, O. Matsumoto, T. Kurita, T. Sekine, M. Miyamoto, H. Kan, Y. Tuchiya, and H. Furukawa, “Thermal management of high energy diode-pumped solid-state laser for inertial fusion energy and high-field applications,” International Symposium on Topical Problems of Nonlinear Wave Physics 2005 (St.Petersburg-Nizhny Novgorod, Russia, August 2005), NWP-2, pp.55.
• R. Yasuhara, T. Kawashima, H. Furukawa, T. Ikegawa, O. Matsumoto, T. Sekine, T. Kurita, H. Kan, J. Kawanaka, T. Norimatsu, and Y. Izawa, “Face-cooled and edge-insulated multi-disk Faraday rotator for high peak and high power,” International Symposium on Topical Problems of Nonlinear Wave Physics 2005 (St.Petersburg-Nizhny Novgorod, Russia, August 2005), NWP-2, pp.135.
• J. Kawanaka, “Novel High-Power Laser Systemwith Cooled Yb-doped Materials,” Japan Korea Collaborative Workshop on Advanced Technology of Lasers for Laser-aided Fusion Plasma Diagnostics (KAIST, Daejon, Korea, 21 Dec. 2005)
• T. Kawashima, T. Ikegawa, J. Kawanaka, N. Miyanaga, M. Nakatsuka, Y. Izawa, O. Matsumoto, R. Yasuhara, T. Kurita, T. Sekine, M. Miyamoto, H. Kan, H. Furukawa, S. Motokoshi, and T. Kanabe, “The HALNA project: diode-pumped solid-state laser for inertial fusion energy,” Inertial Fusion Sciences and Applications 2005, B. A. Hammel, D. D. Meyerhofer, J. Meyer-ter-Vehn and H. Azechi ed., (Am. Nucl. Soc., 2006) submitted.
• T. Ikegawa, T. Kawashima, H. Furukawa, J. Kawanaka, N. Miyanaga, M. Nakatsuka, Y. Izawa, and H. Kan, “Design of a diode-puped 1-kJ zig-zag slab laser with cryogenically cooled ceramic Yb:YAG,” Inertial Fusion Sciences and Applications 2005, B. A. Hammel, D. D. Meyerhofer, J. Meyer-ter-Vehn and H. Azechi ed., (Am. Nucl. Soc., 2006) submitted.
• N. Miyanaga, M. Nakatsuka, K. Yoshida, H. Nakano, H. Kubomura, T. Kawashima, J. Nishimae, Y. Suzuki, N. Tuchiya, T. Kanabe, T. Jitsuno, H. Fujita, J. Kawanaka, K. Tsubakimoto, Y. Fujimoto, H. Furukawa, J. Lu, S. Matsuoka, T. Ikegawa, Y. Owadano, and K. Ueda, “Conceptual design of laser fusion reactor KOYO-Fast −Laser driver−,” Inertial Fusion Sciences and Applications 2005, B. A. Hammel, D. D. Meyerhofer, J. Meyer-ter-Vehn and H. Azechi ed., (Am. Nucl. Soc., 2006) submitted.
• Junji Kawanaka, Shigeki Tokita, Hajime Nishioka and Ken-ichi Ueda, Masayuki Fujita, Toshiyuki Kawashima, Hideki Yagi and Takagimi Yanagitani, “Efficient Active-Mirror Laser Oscillator with a Cooled Yb:YAG Ceramics,” Advanced Solid-State Photonics (ASSP, OSA), WB8 (2006).
• S. Tokita, J. Kawanaka, Y. Izawa, Masayuki Fujita, and Toshiyuki Kawashima, “High-average-power, high-efficient operation of Q-switched cryogenic Yb:YAG laser,” Advanced Solid-State Photonics (ASSP, OSA), TuB16 (2006).
• O. Matsumoto, R. Yasuhara, T. Kurita, T. Ikegawa, T. Sekine, T. Kawashima, J. Kawanaka, T. Norimatsu, N. Miyanaga, Y. Izawa, M. Nakatsuka, M. Miyamoto, H. Kan, H. Furukawa, and S. Motokoshi, “Development of thermally controlled diode-pumped solid-state laser,” Proc. SPIE, Lasers and Applications in Science and Technology(LASE2006), 6101 (2006) (in press).

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