{"id":1009,"date":"2018-09-10T09:42:33","date_gmt":"2018-09-10T00:42:33","guid":{"rendered":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/?page_id=1009"},"modified":"2022-06-02T15:51:55","modified_gmt":"2022-06-02T06:51:55","slug":"pls","status":"publish","type":"page","link":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/groups\/research01\/pls\/","title":{"rendered":"Power Laser System engineering (PLS)"},"content":{"rendered":"

Summary<\/h2>\n

Our group\u2019s activities focus primarily on the development of laser drivers for nuclear fusion reactors, and applied research derived from the findings of nuclear fusion developments. Currently, the most promising fusion driver candidate is a solid-state laser excited by a semiconductor laser (LD). So far, the group has developed a high-power glass laser (HALNA, 10 J @ 10 Hz), and a high efficiency YAG laser (LD light \u2192 pulse laser light conversion efficiency of 80 %). The group\u2019s research foundations for laser development lies in the investigation of optical materials and film production methods, such as laser materials, mirrors, and non-linear materials. The group addresses the challenges of increasing yield strengths and improving functionality from a variety of different angles, and aims to realize a high energy density laser.<\/p>\n

Group website<\/a><\/p>\n

Research topics<\/h2>\n

1.Yb : YAG Solid-state Lasers<\/h3>\n

1.1 \u00a0Evaluation of New Materials\u00a0\u00a0 Kawanaka
\n1.2 Increasing the Pulse Energy of Cooled Yb : YAG Amplifier\u00a0\u00a0 Kawanaka, Sekine
\n1.3 Increasing the Average Power of Cooled Yb : YAG Amplifier\u00a0\u00a0 Tokita, Yoshida
\n1.4 Characterization of Non-linear Materials\u00a0\u00a0 Yasuhara, Takeuchi
\n\"\"<\/p>\n

2.Nd : YAG Solid-state Laser (enhancing HALNA performance)<\/h3>\n

2.1 General\u00a0\u00a0 Kawashima, Kawanaka
\n2.2 Improvement of Spatial Beam Shape\u00a0\u00a0 Matsumoto, Yasuhara
\n2.3 Uniform Temperature Distribution of Slab Amplifiers\u00a0\u00a0 Kurita
\n2.4 Stability Control of Longitudinal Modes\u00a0\u00a0 Kawashima, Sekine<\/p>\n

\"\"<\/p>\n

3.Ultra-high peak power laser<\/h3>\n

3.1 Improving non-linear material performance and generation of ultra-short pulses\u00a0\u00a0 Ogawa<\/p>\n

\"\"<\/p>\n

Academic papers and international conference presentations in 2005<\/h2>\n
    \n
  • Junji Kawanaka, “Yb-Doped Solid-State Lasers at Low Temperature\u201d, Laser Society of Japan, No. 4 issue, vol. 33, pp. 243-248 (2005).<\/li>\n
  • S. Tokita, J. Kawanaka, M. Fujita, T. Kawashima, and Y. Izawa, \u201cSapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers,\u201d Appl. Phys. B vol. 80, pp. 635-638 (2005).<\/li>\n
  • J. Kawanaka, S. Tokita, H. Nishioka, M. Fujita, K. Yamakawa, K. Ueda and Y. Izawa, \u201cDramatically Improved Laser Characteristics of Diode-Pumped Yb-Doped Materials at Low Temperature,\u201d Laser Physics 15, pp. 1306-1312 (2005).<\/li>\n
  • S. Tokita, J. Kawanaka, M. Fujita, T. Kawashima and Y. Izawa, \u201cEfficient High-Average-Power Operation of Q-Switched Cryogenic Yb:YAG Laser Oscillator,\u201d Jpn. J. Appl. Phys 44, L1529-L1531(2005).<\/li>\n
  • S. Tokita, J. Kawanaka, M Fujita, T. Kawashima and Y. Izawa, \u201cSapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers,\u201d Advanced Solid-State Photonics (ASSP, OSA), MF44 (2005).<\/li>\n
  • J. Kawanaka, \u201cNew Concept of DPSSL – Tuning laser parameters by controlling temperature -,\u201d 2005 US-Japan Workshop on Laser-IFE (General Atomics, San Diego, March 2005).<\/li>\n
  • 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, \u201cThermally-Edge-Controlled Slab Laser for Inertial Fusion Energy and Applications,\u201d Conference on Lasers and Electro-Optics (CLEO2005, OSA), CMJ5 (2005).<\/li>\n
  • J. Kawanaka, \u201cA cryo-cooled ytterbium-doped laser materials for IFE driver \u2212New concept of DPSSL-,\u201d 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 2-1 (2005).<\/li>\n
  • 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, \u201cRecent progress of HALNA DPSSL driver development,\u201d 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 1-2(2005).<\/li>\n
  • T. Kawashima, T. Ikegawa, H. Furukawa, R. Yasuhara, J. Kawanaka, and Y. Izawa, \u201cThermo-optical modeling for the HALNA slab amplifier,\u201d 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 3-2 (2005).<\/li>\n
  • T. Kawashima and T. Kurita, \u201cDesign of optical pump delivery system for HALNA,\u201d 2nd International Workshop on High Energy Class Diode Pumped Solid State Lasers 2005 (HEC-DPSSL 2005), 5-2(2005).<\/li>\n
  • S. Tokita, J. Kawanaka, Y. Izawa, M. Fujita, and T. Kawashima, \u201cSapphire-cooling at both faces of high-power cryogenic Yb:YAG disk laser,\u201d Conference on Lasers and Electro-Optics Europe 2005 (CLEO\/Europe 2005, EPS\/IEEE\/OSA), CA2-2-MON (2005).<\/li>\n
  • J. Kawanaka, H. Nishioka, Y. Izawa, and K. Ueda, \u201cActive-mirror oscillator with cryogenically cooled Yb-doped materials\u201d Conference on Lasers and Electro-Optics Europe 2005 (CLEO\/Europe 2005, EPS\/IEEE\/OSA), CA2-3-MON (2005).<\/li>\n
  • 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, \u201cDiode-pumped, thermally-edge-controlled slab laser with high-energy and large-aperture,\u201d Conference on Lasers and Electro-Optics Europe 2005 (CLEO\/Europe 2005, EPS\/IEEE\/OSA), CA5-1-THU (2005).<\/li>\n
  • 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, \u201cDiode-pumped thermally-controlled zig-zag slab laser with 20-J pulse energy in 10 ns at 10-Hz repetition rate,\u201d Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-3.<\/li>\n
  • T. Sekine, R. Yasuhara, T. Kawashima, T. Ikegawa, O. Matsumoto, T. Kurita, Y. Tsuchiya, J. Kawanaka, T. Norimatsu, and Y. Izawa, \u201c1-J at 10 Hz output diode-pumped Nd:YLF regenerative ring amplifier,\u201d Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-4.<\/li>\n
  • 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, \u201c8.4 J at 10 Hz laser operation of Nd:glass zig-zag slab amplifier pumped by 290 kW peak power diode array,\u201d Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-5.<\/li>\n
  • J. Kawanaka, S. Tokita, H. Nishioka, M. Fujita, T. Kawashima, T. Yanagitani, K. Ueda, and Y. Izawa, \u201cCryogenically-cooled active-mirror oscillator with Yb-doped material for inertial fusion energy driver,\u201d Pacific Rim Conference on Lases and Electro-Optics 2005 (CLEO-PR, Tokyo, July 2005), Ctul2-6.<\/li>\n
  • 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, \u201cDevelopment of HALNA driver with thermally-edge-controlled slab amplifier module,\u201d 14th International Laser Physics Workshop 2005 (Kyoto, July 2005), Seminor4.4.5.<\/li>\n
  • 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, \u201cThermal management of high energy diode-pumped solid-state laser for inertial fusion energy and high-field applications,\u201d International Symposium on Topical Problems of Nonlinear Wave Physics 2005 (St.Petersburg-Nizhny Novgorod, Russia, August 2005), NWP-2, pp.55.<\/li>\n
  • R. Yasuhara, T. Kawashima, H. Furukawa, T. Ikegawa, O. Matsumoto, T. Sekine, T. Kurita, H. Kan, J. Kawanaka, T. Norimatsu, and Y. Izawa, \u201cFace-cooled and edge-insulated multi-disk Faraday rotator for high peak and high power,\u201d International Symposium on Topical Problems of Nonlinear Wave Physics 2005 (St.Petersburg-Nizhny Novgorod, Russia, August 2005), NWP-2, pp.135.<\/li>\n
  • J. Kawanaka, \u201cNovel High-Power Laser Systemwith Cooled Yb-doped Materials,\u201d Japan Korea Collaborative Workshop on Advanced Technology of Lasers for Laser-aided Fusion Plasma Diagnostics (KAIST, Daejon, Korea, 21 Dec. 2005)<\/li>\n
  • 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, \u201cThe HALNA project: diode-pumped solid-state laser for inertial fusion energy,\u201d 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.<\/li>\n
  • T. Ikegawa, T. Kawashima, H. Furukawa, J. Kawanaka, N. Miyanaga, M. Nakatsuka, Y. Izawa, and H. Kan, \u201cDesign of a diode-puped 1-kJ zig-zag slab laser with cryogenically cooled ceramic Yb:YAG,\u201d 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.<\/li>\n
  • 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, \u201cConceptual design of laser fusion reactor KOYO-Fast \u2212Laser driver\u2212,\u201d 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.<\/li>\n
  • Junji Kawanaka, Shigeki Tokita, Hajime Nishioka and Ken-ichi Ueda, Masayuki Fujita, Toshiyuki Kawashima, Hideki Yagi and Takagimi Yanagitani, \u201cEfficient Active-Mirror Laser Oscillator with a Cooled Yb:YAG Ceramics,\u201d Advanced Solid-State Photonics (ASSP, OSA), WB8 (2006).<\/li>\n
  • S. Tokita, J. Kawanaka, Y. Izawa, Masayuki Fujita, and Toshiyuki Kawashima, \u201cHigh-average-power, high-efficient operation of Q-switched cryogenic Yb:YAG laser,\u201d Advanced Solid-State Photonics (ASSP, OSA), TuB16 (2006).<\/li>\n
  • 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, \u201cDevelopment of thermally controlled diode-pumped solid-state laser,\u201d Proc. SPIE, Lasers and Applications in Science and Technology(LASE2006), 6101 (2006) (in press).<\/li>\n<\/ul>\n

    Members<\/h2>\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n
    YOGO Akifumi<\/td>\nProfessor<\/td>\n<\/tr>\n
    TSUBAKIMOTO Koji<\/td>\nAssociate Professor<\/td>\n<\/tr>\n
    OGINO Jumpei<\/td>\nAssistant Professor<\/td>\n<\/tr>\n
    MIYANAGA Noriaki<\/td>\nSpecially Appointed Professor\/Professor Emeritus<\/td>\n<\/tr>\n
    YOSHIDA Hidetsugu<\/td>\nSpecially Appointed Researcher<\/td>\n<\/tr>\n
    SOMEKAWA Tomohiro<\/td>\nGuest Associate Professor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    Summary Our group\u2019s activities focus primarily on the development of laser drivers for nuclear fusion reactors […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":75,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_links_to":"","_links_to_target":""},"_links":{"self":[{"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/pages\/1009"}],"collection":[{"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/comments?post=1009"}],"version-history":[{"count":14,"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/pages\/1009\/revisions"}],"predecessor-version":[{"id":4166,"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/pages\/1009\/revisions\/4166"}],"up":[{"embeddable":true,"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/pages\/75"}],"wp:attachment":[{"href":"http:\/\/www-wp22.ile.osaka-u.ac.jp\/eng\/wp-json\/wp\/v2\/media?parent=1009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}