| Project/Area Number |
26800166
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Omachi Junko 東京大学, 大学院理学系研究科(理学部), 特任助教 (70724053)
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| Research Collaborator |
YOSHIOKA Kosuke 東京大学, 大学院工学系研究科, 准教授 (70451804)
GONOKAMI Makoto (KUWATA Makoto) 東京大学, 総長 (70161809)
ISHIZAKA Kyoko 東京大学, 大学院工学系研究科, 准教授 (20376651)
SHIMOJIMA Takahiro 理化学研究所, 強相関物理部門, 研究員 (70581578)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | ファブリーペロー共振器 / 高繰り返し化 / ピコ秒チタンサファイアモード同期レーザー / 光電子分光 / 深紫外光源 / レーザー光電子分光 / 縦モード安定化 |
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| Outline of Final Research Achievements |
Our aim is to develop the ultraviolet light source for a highly-effective, high-resolution, angle-resolved photoelectron spectroscopy (ARPES) with a spherical electron analyzer. A high-spectral-resolution measurement in a short acquisition time without the space charge effect requires the ultraviolet pulses with low pulse energy and high repetition rate. We made an active-controlled short cavity after the fourth harmonic of the light from a 10 ps, 74 MHz, Ti: sapphire mode-locked laser. We achieved the 15 times multiplication of the repetition rate (1.1 GHz) and a decrease by 2 orders of magnitude in the pulse energy as well, resulting in a decrease by 2 orders of magnitude in the acquisition time on an ARPES measurement without degrading the resolution compared to that with the original 74 MHz pulses. Additionally, we developed an active-controlled system onto the laser to stabilize a longitudinal-mode fluctuation, which is required when we use a high-finesse cavity.
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