| Project/Area Number |
10554034
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Physical chemistry
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| Research Institution | Kobe University |
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Principal Investigator |
TOMINAGA Keisuke Kobe University, Faculty of Science, Associate Professor, 理学部, 助教授 (30202203)
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| Co-Investigator(Kenkyū-buntansha) |
KASAHARA Shunji Kobe University, Faculty of Science, Research Associate, 理学部, 助手 (00260646)
NIIKURA Shinji Spectra-Physics K-K., Laser Product Division, Technical Support Manager, フィジックス社株式会社・レーザープロダクト事業部, テクニカルサポート・マネージャー
SARUKURA Nobuhiko Okazaki Research Institute, Institute for Molecular Science, Associate Professor, 分子科学研究所, 助教授 (40260202)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥11,000,000 (Direct Cost: ¥11,000,000)
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| Keywords | Ti : sapphire laser / femtosecond laser / cavity-dumper / multi-pass amplifire / ultrafast spectroscopy / キャビティ・タンパー / キャビティ・ダンパー |
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| Research Abstract |
We have developed an intra-cavity dumped femtosecond Ti : sapphire laser system and its multi-pass amplifier to obtain a moderately high energy short pulse, enough to perform third order optical nonlinear experiment in liquid solutions. Currently, commercially available femtosecond Ti : sapphire laser systems are either (1)Ti : sapphire oscillator (general price = 18,000,000 yen), which yields a pulse with an energy of 4 nJ/pulse, or (2)Ti : sapphire oscillator and its amplifier (general price = 50,000,000 yen), which yields a pulse with an energy of 1 mJ/pulse. In order to perform experiment with a short pulse in chemical systems such as transient absorption or photon echo, we need a pulse with an energy around mJ/pulse to sub mJ/pulse. Therefore, a new short pulse laser system is desirable to get s moderately high energy pulse. In this research project we here calculated stability of oscillation for the cavity-dumped Ti : sapphire laser by the ABCD matrix formalism. We have investigated both the five-mirror configuration and six-mirror configuration theoretically and experimentally. The cavity dumper laser produces a pulse width of 13 fs and energy of 67 nJ/pulse at 4 MHz. Currently, a multi-pass (six-pass) amplifier with a Ti : sapphire crystal is being designed and constructed to get a higher energy pulse. The purpose of this amplifier is to get a pulse with an energy more than sub microJ/pulse at 20 kHz. We are also writing a manual to construct this laser system and are planning to distribute it to public.
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