在激光无线能量传输（LWPT）中，传能激光波长、光功率和光电池温度对光电池的输出特性有显著影响，最大功率跟踪（MPPT）技术可解决上述等因素造成的功率失配问题，提升系统的DC-DC效率。构建了针对LWPT的MPPT集成仿真系统，耦合了波长、光功率和温度对GaAs光电池输出特性的综合影响，可以同时分析光电池在功率匹配、功率失配和MPPT调制等多种条件下的输出特性。基于该仿真系统，研究了光电池在不同波长、光功率和温度条件下的物理规律。波长增大时，在850 nm左右转换效率η_max达到最大值为50%，波长继续增大，光子能量小于GaAs禁带宽度导致η_max迅速下降。功率增大时，η_max基本不变，最大功率匹配电阻R_Lmax减小。温度升高时，η_max和R_Lmax均持续下降。此外，研究了光电池在功率失配时的输出特性，此时光电池的转换效率对比功率匹配时均有不同程度的下降。根据光电池的输出特性在仿真系统设计了MPPT电路，利用时间扰动算法进行最大功率跟踪。光电池在MPPT系统调制后均可工作在功率匹配时的最大功率点，且光电池能源利用率达到99.93%。研究结果对用于激光输能有重要指导意义。

We review the present status and future prospects of fast ignition (FI) research of the theoretical group at the IAPCM (Institute of Applied Physics and Computational Mathematics, Beijing) as a part of the inertial confinement fusion project. Since the approval of the FI project at the IAPCM, we have devoted our efforts to improving the integrated codes for FI and designing advanced targets together with the experimental group. Recent FI experiments [K. U. Akli et al., Phys. Rev. E 86, 065402 (2012)] showed that the petawatt laser beam energy was not efficiently converted into the compressed core because of the beam divergence of relativistic electron beams. The coupling efficiency can be improved in three ways: (1) using a cone–wire-in-shell advanced target to enhance the transport efficiency, (2) using external magnetic fields to collimate fast electrons, and (3) reducing the prepulse level of the petawatt laser beam. The integrated codes for FI, named ICFI, including a radiation hydrodynamic code, a particle-in-cell (PIC) simulation code, and a hybrid fluid–PIC code, have been developed to design this advanced target at the IAPCM. The Shenguang-II upgraded laser facility has been constructed for FI research; it consists of eight beams (in total 24 kJ=3!, 3 ns) for implosion compression, and a heating laser beam (0.5–1 kJ, 3–5 ps) for generating the relativistic electron beam. A fully integrated FI experiment is scheduled for the 2014 project.