Acta Optica Sinica, Volume. 29, Issue 9, 2630(2009)
High Efficiency Frequency-Doubling of Femtosecond Laser Pulses with Simultaneously Spatial Walk-Off and Phase Velocity Compensation
Frequency-doubling is investigated using two BBO crystals with 70-fs, 800-nm laser pulses at the repetition of 10 Hz . The size of crystals are both 10 mm×10 mm×0.2 mm . Focused on spatial walk-off and phase velocity mismatching, the angle between the axes of the two crystals and the phase velocity mismatching of the fundamental pulse are adjusted respectively. It is experimentally demonstrated that the spatial walk-off could be compensated by use of two crystals placed anti-parallel, and angle mismatching with some degree may compensate phase velocity mismatching of the frequency-doubled pulse. The frequency-doubled pulse with bandwidth of 6.7 nm and energy of more than 2.8 mJ is achieved. The frequency-doubling conversion efficiency reaches 35.7%, which is improved by a factor of 1.7 related to a single crystal in the same condition.
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Zhou Xugui, Wang Yanling, Wu Hong, Ding Liang′en. High Efficiency Frequency-Doubling of Femtosecond Laser Pulses with Simultaneously Spatial Walk-Off and Phase Velocity Compensation[J]. Acta Optica Sinica, 2009, 29(9): 2630
Category: Ultrafast Optics
Received: Oct. 31, 2008
Accepted: --
Published Online: Oct. 9, 2009
The Author Email: Xugui Zhou (51060602050 @ecnu.cn)