Investigations of spectrally tunable, nanosecond laser pulse compression characteristics by SBS technique
| Project/Area Number |
21K04934
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | Institute for Laser Technology |
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Principal Investigator |
コスロービアン ハイク 公益財団法人レーザー技術総合研究所, レーザープロセス研究チーム, 副主任研究員 (70291036)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | SBS / ns pulse compression / compact SBS cell / SBS; / ns pulse compression; / compact SBS cell; / 誘導ブリルアン散乱 / パルス圧縮 |
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| Outline of Research at the Start |
In this research, wavelength (color) tunable, several nanoseconds (1 ns = 0.000000001 seconds) duration optical pulse compression characteristics based on the stimulated Brillouin scattering (SBS) non-linear phenomenon will be elucidated. For this purpose, a color-tunable Ti:Sapphire pulse-laser will be used and a variable-length, compact SBS amplifier cell will be designed and built. Spectral characteristics of the pulse compression in different media will be elucidated.
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| Outline of Annual Research Achievements |
We reduced the linewidth of the pulses by employing an etalon inside the laser resonator. In this way, we strived to increase the coherence length of the pulses and improve the pulse compression factor and the energy conversion efficiency. We successfully performed wavelength-dependent pulse compression measurements for two SBS liquids (FC72 and FC40) and several geometries with different interaction lengths.
Due to the shorter phonon lifetime (0.2 ns vs. 1.2 ns), the compressed pulse FWHM in FC40 was more efficient than in FC72. The SBS energy conversion efficiency was still low, ~ 0.6 (~ 0.7, if 20 % optical losses of the system are taken into consideration). Our analysis showed that the main reason for this is still the short coherence length of the pump pulses (2 cm or 15 GHz).
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
Although I ordered an SHG crystal and a dichroic mirror several months ago with a goal to generate the second-harmonics of the compressed pulses, it arrived just a week ago. So, the experiments planned for the last year will be shifted to this year.
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| Strategy for Future Research Activity |
In our forthcoming experiments we will try to further reduce the linewidth of the pulses.
We will also use another Ti:Sapphire laser with shorter ns pulses.
We will construct a second harmonics generation (SHG) unit and characterize the frequency doubling properties of the SBS compressed pulses.
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Report
(2 results)
Research Products
(5 results)
