Decrease spectral phase modulation with spectral scanning filter for coherent pulse contrast improvement in femtosecond laser system

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• 作者：Zairu Ma ; ^{simazairu@sina.com.cn" class="auth_mail" title="E-mail the corresponding author} ; Jiang Yun ; Du Quan ; Deng Xueru ; Zhao Zhengquan
• 关键词：Ultrafast technology ; Spectral scanning filtering ; Spectral phase modulation ; Coherent pulse contrast
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：127
• 期：5
• 页码：2539-2544
• 全文大小：1571 K

文摘

A spectral scanning filter method for decreasing the spectral phase modulation to improve the coherent intensity contrast in the chirped pulse amplification system is proposed and studied theoretically, which is made use of the frequency offset between the chirped signal pulse and the prepulse (or the postpulse). The spectral scanning filter based on the rapid Fabry–Pérot (F–P) interference for reducing the pre-pulse and post-pulse originated from the spectral phase modulation is analyzed theoretically and simulated numerically. The numerical simulation results show that the coherent pulse contrast can be improved by 0.41F² for the chirped pulse and the compressed pulse, and the transmission efficiency of the chirped signal pulse can exceed 90% when the synchronizing time jitter ranges from −2 ps to 2 ps and the chirp rate parametric from −0.1C/T² to 0.1C/T².