在相同的抽运功率下,激光器工作在高阶模式时比基模高斯工作时有更高的功率输出,将其用于相干合成有望得到更高的功率输出。由于高阶高斯光束内部存在0-π相位差,使得其光束质量较差,相干合成激光亮度也因而受限。提出基于波前补偿的高阶高斯光束相干合成方案,利用光束净化将高阶高斯光束内部0-π相位进行补偿,然后将补偿后的光束用于相干合成。给出了优化式自适应光学光束净化补偿高阶高斯光束内部波前的仿真和实验结果,数值模拟了厄米高斯光束波前补偿前后相干合成的效果。结果表明,波前补偿后相干合成的1倍衍射极限内的桶中功率较波前补偿前相干合成桶中功率提高1个量级甚至2~3个量级。 At the same pumping power, the laser operates in higher-order modes with higher power output than the fundamental-mode Gaussian, and is expected to achieve higher power output for coherent synthesis. Due to the 0-π phase difference existing in higher-order Gaussian beams, the beam quality is poor and the coherent synthesized laser brightness is also limited. A coherent high-order Gaussian beam synthesis scheme based on wavefront compensation is proposed. The inner phase of the high-order Gaussian beam is compensated by beam cleaning, and then the compensated beam is used for coherent combination. The simulation and experimental results on the internal wave front of high-order Gaussian beam are given by the optimized adaptive optical beam purification. The effect of coherent integration before and after the Hermite beam front-end compensation is numerically simulated. The results show that the power in the barrel within 1X diffraction limit of the coherent composite after wavefront compensation increases one order of magnitude or even two or three orders of magnitude compared with that before the wavefront compensation.