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Chin. Phys. B, 2009, Vol. 18(10): 4308    DOI: 10.1088/1674-1056/18/10/036

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

Wang Yan-Ling, Zhou Xu-Gui, Wu Hong, Ding Liang-En
State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China
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.
Keywords:  sum-frequency      nonlinear frequency conversion      ultrafast laser  
Received:  16 December 2008      Revised:  26 February 2009      Published:  20 October 2009
PACS:  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
  42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
Fund: 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).

Cite this article: 

Wang Yan-Ling, Zhou Xu-Gui, Wu Hong, Ding Liang-En Efficient collinear frequency tripling of femtosecond laser with compensation of group velocity delay 2009 Chin. Phys. B 18 4308

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