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Generation of a high-temporal contrast ultrafast laser pulse near 1,053 nm through stimulated Raman frequency shift

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Abstract

A high-temporal contrast femtosecond Stokes pulse near 1,053 nm is obtained simply without polarizer extinction ratio limitation based on the stimulated Raman frequency shift process in ethanol with an 800-nm femtosecond Ti:sapphire laser as a pump source. By optimizing the incident pump pulse chirp and the ethanol Raman cell length, a clean Stokes pulse near 1,053 nm with a maximum energy of 0.24 mJ is obtained with ~7.5 % conversion efficiency and 0.8 % (rms) energy fluctuation. Compared with the incident pump pulse, the temporal contrast of the Stokes pulse is improved by at least approximately three orders of magnitude.

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Acknowledgments

This work is supported by the National Basic Research Program of China (Grant No. 2011CB808101), the Chinese Academy of Science, National Natural Science Foundation of China (NSFC) (Grant Nos. 61078037, 11127901, 11134010, and 11204328), and the International S&T Cooperation Program of China (Grant No. 2011DFA11300).

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Correspondence to Yuxin Leng or Ruxin Li.

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Guo, X., Xu, Y., Li, Y. et al. Generation of a high-temporal contrast ultrafast laser pulse near 1,053 nm through stimulated Raman frequency shift. Appl. Phys. B 117, 973–978 (2014). https://doi.org/10.1007/s00340-014-5916-9

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  • DOI: https://doi.org/10.1007/s00340-014-5916-9

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