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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。
The double-pulse bidirectional transmission amplification configuration can simultaneously transmit and amplify the two laser pulses in two directions along the main amplifier space symmetrically, which effectively increases the energy storage extraction rate of the amplifier and has great application value in the field of inertial confinement fusion laser driver . Through the establishment of the equivalent optical path, the superposition of the wavefront distortion of the two laser pulses during propagation amplification is deduced. The measured data in the SG-Ⅲ host computer are numerically simulated. The results show that there is a certain difference in the wavefront shapes of the two laser pulses under the two-way transmission amplification configuration, the wavefront aberrations are concentrated in the low frequency range, and the laser pulses and the output laser pulses at the apertures of the three- and four- The wavefront distortion larger. To ensure the quality of the output beam and the passage of the light beam through the spatial filter aperture, the wavefront aberration within the main amplifier must be compensated for control. These conclusions will provide theoretical guidance for the design of the wavefront control scheme of double pulse bi-directional transmission amplification.