Spatial chirp in Ti:sapphire multipass amplifier

doi:10.1088/1674-1056/26/3/034206

Abstract 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.

Keywords: spatial chirp multipass amplifier Ti:sapphire

Received: 07 November 2016
Revised: 09 December 2016
Accepted manuscript online:

PACS:	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	79.20.Ds	(Laser-beam impact phenomena)
	42.55.Rz	(Doped-insulator lasers and other solid state lasers)

Fund: Project supported by 100 Talents Program of Chinese Academy of Sciences, the National Natural Science Foundation of China (Grant Nos. 61475169, 61521093, and 11127901), and the Youth Innovation Promotion Association of Chinese Academy of Sciences.

Corresponding Authors: Yi Xu, Yuxin Leng
E-mail: xuyi@.siom.ac.cn;lengyuxin@mail.siom.ac.cn

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Wenkai Li(黎文开), Jun Lu(陆俊), Yanyan Li(李妍妍), Xiaoyang Guo(郭晓杨), Fenxiang Wu(吴分翔), Linpeng Yu(於林鹏), Pengfei Wang(王朋飞), Yi Xu(许毅), Yuxin Leng(冷雨欣) Spatial chirp in Ti:sapphire multipass amplifier 2017 Chin. Phys. B 26 034206

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