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Femtosecond pulses cleaning by transient-grating process in Kerr-optical media |
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| Authors: | Jun Liu Kotaro Okamura Yuichiro Kida and Takayoshi Kobayashi Advanced Ultrafast Laser Research Center and |
| Affiliation: | Takayoshi Kobayashi 1,2,4,5 1 Advanced Ultrafast Laser Research Center, and Department of Engineering Science, Faculty of Informatics and Engineering, Department of Engineering Science, The University of Electro-Communications,1-5-1, Chofugaoka, Chofu, Tokyo 182-8585, Japan 2 International Cooperative Research Project (ICORP), Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan 3 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China 4 Department of Electrophysics, National Chiao Tung University, 1001 Ta Hsueh Rd. Hsinchu 300, China 5 Institute of Laser Engineering, Osaka University, Yamadakami 2-6, Suita, Osaka 565-0871, Japan |
| Abstract: | We use a transient-grating (TG) process in a Kerr bulk medium to clean a femtosecond laser pulse. Using the technique, the temporal contrast of the generated TG signal is improved by more than two orders of magnitude in comparison with the incident pulse in a 0.5-mm-thick fused silica plate. The laser spectrum is smoothed and broadened, and the pulse duration is shortened simultaneously. We expect to extend this technique to a clean pulse with broadband spectral bandwidth at a wide spectral range because it is a phase-matched process. |
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