B integral limitation in high power fiber chirped pulse amplification optical source
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摘要: 基于金斯堡-朗道方程模型,针对100 kHz光纤啁啾脉冲放大系统中的B积分受限问题进行了理论分析,包含群速色散、增益色散、平均功率饱和和能量饱和效应及自相位调制效应。给出了典型放大器构型下脉冲可压缩性随B积分的变化关系。得到了展宽脉冲宽度为1 ns条件下,亚ps压缩脉冲对系统总的B积分限值约为40 rad。对短间隔脉冲串放大特性和B积分进行了理论研究,验证了在单脉冲B积分受限不变的情况下可以实现总脉冲能量倍增。Abstract: Based on the Ginzburg-Landau equation, the limitation of the B integral issue is studied via numerical simulation for 100 kHz fiber chirped pulse amplification system. The compressibility of the pulse with the B integral under the typical amplifier structure is analyzed. The B integral limitation for 1 ns stretched pulse and 1 ps compressed pulse is given to be around 40 rad. A multi-pulse scheme is proposed to suppress the B integral of each pulse and is verified by theoretical simulation.
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Key words:
- chirped pulse amplification /
- B integral /
- pulse burst
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