| Project/Area Number |
23246029
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Production engineering/Processing studies
|
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| Research Institution | Osaka University |
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Principal Investigator |
OHMURA ETSUJI 大阪大学, 工学(系)研究科(研究院), 教授 (90144435)
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| Project Period (FY) |
2011-11-18 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 超短パルスレーザ / 光吸収性媒質 / 内部加工 / 溶接 / 非線形光学 / 自己集束 |
|---|
| Research Abstract |
The beam diameter, the beam profile and the transmittance of an ultrashort pulse laser propagating in a transparent medium were measured. The optical analysis was performed by considering the beam propagation, the self-focusing and the nonlinear absorption of ultrashort pulse laser in a Kerr medium. Comparing with the experimental results, the nonlinear absorption coefficients of BK7 and fused silica were calculated. Furthermore, the internal processing and the lap welding of glass were conducted with an ultrashort pulse laser. Using the measurement results of the absorption ratio in the inside of glass, heat conduction analysis was carried out, and the processing mechanism was discussed.
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