双脉冲双向传输放大构型波前特性  

Wave-Front Characteristics of Amplification Configuration with Two-Pulse Bidirectional Propagating

作　　者：魏昊波 魏晓峰[1] 王德恩[1] 张晓璐[1] 袁强[1] 薛峤[1] 张鑫[1] 杨英[1] 赵军普[1] 代万俊[1] 胡东霞[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2017年第3期199-205,共7页Chinese Journal of Lasers

摘　　要：双脉冲双向传输放大构型可对两束激光脉冲沿主放大器空间对称的两个方向同时进行传输放大,有效增加了放大器的储能提取率,在惯性约束聚变激光驱动器领域具有很大的应用价值。通过建立等效光路,推导了两束激光脉冲在传输放大时波前畸变的叠加过程,并对神光-Ⅲ主机装置中的实测数据进行了数值模拟。结果表明,双向传输放大构型下两束激光脉冲的波前面形存在一定差异,波前像差集中在低频段,且三、四程放大时空间滤波器小孔处的激光脉冲和输出激光脉冲的波前畸变较大。为保证输出光束质量和光束通过空间滤波器小孔,必须对主放大器内的波前像差进行补偿控制。这些结论将为双脉冲双向传输放大构型的波前控制方案的设计提供理论指导。A two-pulse bidirectional propagating amplification configuration, which employs two laser pulses to propagate along a main amplifier in two directions of symmetric space and amplifies the two-pulse, can effectively increase the extraction efficiency for the stored energy in the amplifier, and has great application value in the field of inertial confinement fusion laser driver. When we build the equivalent optical path, the wave-front distortion superposition process of the two laser pulses in the process of propagation amplification is derived, and the numerical simulation is carried out with the data measured by the Shenguang-I]I host device. The results indicate that the wave-front shapes of the two laser pulses in the bidirectional propagating amplification configuration are different. The wave-front aberration mainly concentrates in low frequency range. Moreover, the wave-front distortions of the output laser pulse and the laser pulse from the pinhole of spatial filter which is with three-pass and four-pass amplification are large. Thus, the wave-front aberration must be compensated and controlled to ensure the quality of output beam and the beam pass through the spatial filter pinhole. These conclusions provide theoretical guidance for the design of wave-front control scheme of two-pulse bidirectional propagating amplification configuration.

关 键 词：激光光学 高功率激光 波前特性 数值模拟 双脉冲双向传输放大构型 多程放大 

分 类 号：TN248.1[电子电信—物理电子学]