用于快点火的激光驱动器组束方式
Laser driver beam combination for fast ignition
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摘要: 根据实现快点火激光的预估参数要求，分析了非相干组束和相干组束是否可满足快点火所需的激光功率密度和能量。引入与实际情况相当的畸变波前分析远场焦斑，为了满足能量要求非相干组束需要组合更多的光束，并改进驱动器的稳定性将角漂控制在±2 μrad范围内；相干组束可获得更小的焦斑有利于提高功率密度，同时可降低对能量的要求，但仅对单路光分别进行波前补偿并不能提高能量集中度，需要引入复杂的监测和控制设备对整个通光孔径内的波前(包括束内和束间)进行全局控制。基于目前提出的参数要求和波前校正能力，非相干合成更易实现快点火，但相干合成则具有更广泛的应用潜力。Abstract: Based on the estimated parameters of fast ignition, the requirements for laser-beam power intensity and energy are used to analyze the possibility of realizing fast ignition by coherent combination and noncoherent combination. The practical distorted wavefront is considered to analyze the farfield focal spot. Non-coherent combination needs more beams for energy requirement and to limit angle drifting in ±2 μrad through improving laser driver’s stability. Coherent combination is beneficial for achieving smaller focal spot and higher power intensity, simultaneously reducing the requirement of energy, but single beam wavefront correction can not improve the power intensity in this method, which leads to combined wavefront correction of the total clear aperture with complex monitoring a
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Key words:
- fast ignition /
- non-coherent combination /
- coherent combination /
- wavefront error /
- power intensity
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