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采用相位调制技术产生的具有一定光谱分布的相位调制脉冲可以有效抑制高功率激光驱动器中大口径光学元件的横向受激布里渊散射和满足光束匀滑需求，但该脉冲在装置各系统传输放大过程中，由于光谱畸变会引起幅频（Frequency Modulation to Amplitude Modulation, FM-to-AM）效应，这种效应严重的影响了激光装置的输出性能及实验效果。本文介绍了相位调制脉冲产生原理、引起 FM-to-AM 效应的根本原因及因素，综述了目前美国的国家点火装置（National Ignition Facility, NIF）装置、法国的兆焦耳（Laser Me′ga Joule, LMJ）装置以及我国的神光-Ⅲ主机装置在 FM-to-AM 效应抑制技术方面取得的重要进展。
The phase modulated pulse with a certain spectral distribution generated by the phase modulation technique can effectively suppress the transversely stimulated Brillouin scattering of the large-diameter optical element in the high power laser driver and satisfy the beam smoothing requirement. However, the pulse is amplified in each system of the device During the process, the spectral distortion causes the FM-to-AM effect, which seriously affects the output performance and the experimental results of the laser device. This paper introduces the principle of phase modulation pulse generation and the root causes and factors that cause the FM-to-AM effect. At present, the National Ignition Facility (NIF) device in the United States, Laser Me’ga Joule LMJ) devices and China’s SG-Ⅲ host device FM-to-AM effect suppression technology has made important progress.