2011 Fiscal Year Final Research Report
Development of novel Nd-doped vanadate single crystals for ultra-short pulse lasers
| Project/Area Number |
21350111
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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 | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Hokkaido University |
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Principal Investigator |
HIGUCHI Mikio 北海道大学, 大学院・工学研究院, 准教授 (40198990)
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| Co-Investigator(Renkei-kenkyūsha) |
WADA Satoshi 理化学研究所, 光グリーンテクノロジー特別研究ユニット, ユニットリーダー (90261164)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 超短パルス / ネオジムレーザー / LD励起 / バナジン酸塩 / 浮遊帯溶融法 |
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| Research Abstract |
Novel single crystals of Nd : LaVO4 were grown by the floating zone method and their spectral properties were investigated aiming for development of an ultra-short pulse laser system using a laser diode as a pumping source. The crystals were grown along Z-axis, which is one of the optical elasticity axes, and they were of optically high quality without any macroscopic defects. The absorption and emission spectra showed unusually broadened peaks as a Nd-doped crystals, and their optical aisotropy along each elasticity axis is not significant. When single-mode oscillation was examined, a high slope efficiency of 76 %, which is close to theoretical one, was obtained. A broadened laser spectrum of 14 nm was obtained by multi-mode oscillation, and it is accordingly possible to achieve an ultra-short pulse less than 300 femtosecond.
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