摘要
从啁啾脉冲放大的基本理论出发,详细计算了啁啾脉冲在多通预放大中各个时间点的增益情况,并设计了一个十通预放大器进行了实验研究.结果显示,在抽运通量为1.6J/cm2的非饱和放大情况下,种子脉冲经过十通预放大之后信噪比由10-5提高到10-7.这表明在非饱和抽运通量下,多通预放大器可以有效提高激光脉冲的信噪比.
According to the theory of chirped pulse amplification (CPA),we analyze numerically the gain characteristic of laser pulses in multi-pass amplifier.A CPA Ti:sapphire laser with 10-pass scheme is designed and built.The experimental result shows that the contrast ratio of the femtosecond pulse is obviously enhanced by two orders from 10-5 to 10-7 under a pump flux of 1.6 J/cm2.This work demonstrates that the contrast ratio of the amplified femtosecond laser pulse could be effectively improved by multi-pass preamplifier.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期265-269,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10804128)
国家高技术研究发展计划(批准号:2009AA8044031)
国家重点基础研究发展计划(批准号:2007CB815104)资助的课题~~
关键词
多通预放大
信噪比
飞秒钛宝石激光器
multi-pass preamplifier
contrast ratio
femtosecond Ti:sapphire laser