Abstract：A high contrast 1053 nm femtosecond laser pulse with free background is demonstrated based on non-collinear optical-parametric amplification (NOPA). By permuting the signal and idler in two stages of NOPAs, 48.2 fs, 62 μJ laser pulse at 1053 nm with contrast ratio of 2.3×10?11 is obtained within the time scale of sub-5 ps. The beam quality factors M2 for tangential and sagittal directions are 1.59 and 1.30, respectively. This work not only proves a feasible way to generate a clean femtosecond laser pulse but can also be employed as an ideal frontend for ultrashort ultrahigh intensity Nd:glass-based laser systems.
(Parametric down conversion and production of entangled photons)
引用本文:
. [J]. 中国物理快报, 2014, 31(1): 14207-014207.
SHEN Zhong-Wei, WANG Zhao-Hua, ZHANG Wei, FAN Hai-Tao, TENG Hao, WEI Zhi-Yi. Generation of Femtosecond Laser Pulse at 1053 nm with Contrast of 10?11 by Optical-Parametric Amplification. Chin. Phys. Lett., 2014, 31(1): 14207-014207.
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