Spatial chirp in Ti：sapphire multipass amplifier

The spatial chirp generated in the Ti：sapphire multipass amplifier is numerically investigated based on the one- dimensional （1D） and two-dimensional （2D） Frantz-Nodvik equations. The simulation indicates that the spatial chirp is induced by the spatially inhomogeneous gain, and it can be almost eli...

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Bibliographic Details
Published in:Chinese physics B 2017-03, Vol.26 (3), p.344-348
Main Author: 黎文开 陆俊 李妍妍 郭晓杨 吴分翔 於林鹏 王朋飞 许毅 冷雨欣
Format: Article
Language:English
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Summary:The spatial chirp generated in the Ti：sapphire multipass amplifier is numerically investigated based on the one- dimensional （1D） and two-dimensional （2D） Frantz-Nodvik equations. The simulation indicates that the spatial chirp is induced by the spatially inhomogeneous gain, and it can be almost eliminated by utilization of proper beam profiles and spot sizes of the signal and pump pulses, for example, the pump pulse has a top-hatted beam profile and the signal pulse has a super-Gaussian beam profile with a relatively larger spot size. In this way, a clear understanding of spatial chirp mechanisms in the Ti：sapphire multipass amplifier is proposed, therefore we can effectively almost eliminate the spatial chirp and improve the beam quality of a high-power Ti：sapphire chirped pulse amplifier system.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/3/034206