| 研究課題/領域番号 |
21K04934
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分30020:光工学および光量子科学関連
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| 研究機関 | 公益財団法人レーザー技術総合研究所 |
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研究代表者 |
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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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
3,900千円 (直接経費: 3,000千円、間接経費: 900千円)
2023年度: 390千円 (直接経費: 300千円、間接経費: 90千円)
2022年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2021年度: 2,080千円 (直接経費: 1,600千円、間接経費: 480千円)
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| キーワード | 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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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
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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| 今後の研究の推進方策 |
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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