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Parasitic lasing suppression in high gain femtosecond petawatt Ti:sapphire amplifier

Xiaoyan Liang, Yuxin Leng, Cheng Wang, Chuang Li, Lihuang Lin, Baozhen Zhao, Yunhua Jiang, Xiaoming Lu, Minyuan Hu, Chunmei Zhang, Haihe Lu, Dingjun Yin, Yongliang Jiang, Xingqiang Lu, Hui Wei, Jianqiang Zhu, Ruxin Li, and Zhizhan Xu

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Abstract

New parasitic lasing suppression techniques are developed and high gain amplification is demonstrated in a petawatt level Ti:sapphire amplifier based on the chirped pulse amplification (CPA) scheme. Cladding the large aperture Ti:sapphire with refractive-index matched liquid doped with absorber suppresses the transverse lasing. The acousto-optic programmable dispersive filter (AOPDF) is used to realize side-lobe suppression in the temporal profile of the compressed pulse. The 800 nm laser output with peak power of 0.89 PW and pulse width of 29.0 fs is demonstrated.

©2007 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic layout of the femtosecond PW Ti:sapphire CPA laser system

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Fig. 2.
Fig. 2. Laser spectral profiles from the regenerative amplifier with (dotted line) and without (solid line) the birefringence plate, and from the pre-amplifier (dashed line).

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Fig. 3.
Fig. 3. The gain of the final amplifier without cladding as a function of the pump fluence

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Fig. 4.
Fig. 4. Output energy of the final amplifier as a function of the pump energy

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Fig. 5.
Fig. 5. Measured autocorrelation trace of the compressed laser pulse with AOPDF. The inset shows the result without AOPDF.

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