中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4308-4313.doi: 10.1088/1674-1056/18/10/036

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Efficient collinear frequency tripling of femtosecond laser with compensation of group velocity delay

王燕玲, 周绪桂, 吴洪, 丁良恩   

  1. State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China
  • 收稿日期:2008-12-16 修回日期:2009-02-26 出版日期:2009-10-20 发布日期:2009-10-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2006CB0806001), the Program for Changjiang and Innovative Research Team in University, Shanghai Leading Academic Discipline Project (Grant No B408).

Efficient collinear frequency tripling of femtosecond laser with compensation of group velocity delay

Wang Yan-Ling(王燕玲), Zhou Xu-Gui(周绪桂), Wu Hong(吴洪), and Ding Liang-En(丁良恩)†   

  1. State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China
  • Received:2008-12-16 Revised:2009-02-26 Online:2009-10-20 Published:2009-10-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2006CB0806001), the Program for Changjiang and Innovative Research Team in University, Shanghai Leading Academic Discipline Project (Grant No B408).

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摘要： This paper demonstrates an approach that negative uniaxial crystal has a relative anomalous dispersion effect which can compensate group velocity delay, and applies this approach to nonlinear frequency conversion of an ultrafast laser field. High efficiency of the third harmonic generation is experimentally fulfilled by adopting a collinear configuration of doubing-compensation-tripling system. Through finely adjusting the incident angle and optical axis direction of the compensation plate, it obtains ultraviolet (UV) output energy of 0.32~mJ centered at 270~nm with spectral bandwidth of 2~nm when input beam at 800~nm was 70~fs pulse duration and 6~mJ pulse energy which was extracted from Ti:sapphire laser system by a diaphragm, corresponding to an 800-to-270~nm conversion efficiency of 5.3% and a factor-of-1.6 improvement in the third harmonic generation of UV band in comparison with a general conventional configuration. Furthermore, when the full energy of 18~mJ from a Ti:sapphire laser system was used and optimized, the UV emission could reach 0.83~mJ.

Abstract: This paper demonstrates an approach that negative uniaxial crystal has a relative anomalous dispersion effect which can compensate group velocity delay, and applies this approach to nonlinear frequency conversion of an ultrafast laser field. High efficiency of the third harmonic generation is experimentally fulfilled by adopting a collinear configuration of doubing-compensation-tripling system. Through finely adjusting the incident angle and optical axis direction of the compensation plate, it obtains ultraviolet (UV) output energy of 0.32 mJ centered at 270 nm with spectral bandwidth of 2 nm when input beam at 800 nm was 70 fs pulse duration and 6 mJ pulse energy which was extracted from Ti:sapphire laser system by a diaphragm, corresponding to an 800-to-270 nm conversion efficiency of 5.3% and a factor-of-1.6 improvement in the third harmonic generation of UV band in comparison with a general conventional configuration. Furthermore, when the full energy of 18 mJ from a Ti:sapphire laser system was used and optimized, the UV emission could reach 0.83 mJ.

Key words: nonlinear frequency conversion, ultrafast laser, sum-frequency

中图分类号:  (Ultrafast processes; optical pulse generation and pulse compression)

  • 42.65.Re
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)