| Project/Area Number |
63850015
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
物理計測・光学
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| Research Institution | Kyushu University |
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Principal Investigator |
MAEDA Mitsuo Kyushu University, Engineering, Professor, 工学部, 教授 (80037910)
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Chikahisa Kyushu University, Eng.Sciences, Associate Professor, 総合理工学研究科, 助教授 (20037881)
OKADA Tatsuo Kyushu University, Engineering, Associate Professor, 工学部, 助教授 (90127994)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1989: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1988: ¥4,200,000 (Direct Cost: ¥4,200,000)
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| Keywords | Laser spectroscopy / Dye laser / Raman laser / Tunable laser / Nonlinear optical effect / Vacuum ultraviolet / レーザー分光 / 色素レーザー / ラマンレーザー / 可変波長レーザー |
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| Research Abstract |
1. Objective of Project The objective of the project is to develop a coherent light source continuously tunable over a wide spectral region form the vacuum ultraviolet to the infrared, using higher-order Stokes and anti-Stokes Raman liser with hydrogen pumped by a high-power short-pulse dye laser. The use of higher-order stimulated Raman emission makes it possible to cover a wide spectral region with a limited tunable range of the dye laser.
2. Results of Project (1) A tunable source which can cover down to 209 nm is developed by using a high-pressure hydrogen Raman cell excited by a nanosecond exciser-pumped dye laser ( 2.5 MW, 2 nsFWHM ). Anti-Stokes radiation up to 6th. order was observed. (2) Similar experiment was made by using a commercial dye laser pumped by an exciser laser ( 1 MW, 25 nsFWHM In this case, the tunable range was extended to the vacuum ultraviolet region down to 175 nm with the 7th Anti-Stokes line. (3) In order to extend the tunable region further, increase in the peak power of the dye laser by pulse shortening is required. For this purpose, we tried the generation of stimulated Raman scattering in the picosecond region with a 30 ps KrF laser, and obtained Raman emission over a very wide spectral range down to 128 nm.
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