2023 Fiscal Year Annual Research Report
Investigations of spectrally tunable, nanosecond laser pulse compression characteristics by SBS technique
| Project/Area Number |
21K04934
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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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| Keywords | SBS / pulse compression / tunable laser pulse |
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| Outline of Annual Research Achievements |
A compact ns pulse compressor system based on stimulated Brillouin scattering (SBS) has been designed and built.
Pulse compression experiments of 18-30ns duration, 5-13mJ energy Ti:Sapphire laser pulses in 720-850nm region were performed using FC72 and FC40 SBS liquids.
Compared with the case of no intracavity etalon, the compressed pulse width decreased from 11.2ns to 7.0ns, and the efficiency improved from 42% to 55%. The short coherence length of the pump pulse (13.5 cm, bandwidth 2.23 GHz) has been identified as the main reason for low energy conversion efficiency.
To increase the efficiency, narrowband pulses (longer coherence length) must be used.
We have also built an SHG unit and investigated the SHG conversion efficiency and stability of the compressed pulses in a broader spectral region.
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