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介绍了数字微镜器件(DMD)的工作原理,当DMD某像素微镜的角度固定在+12°或-12°,其在光学上等价于控制该像素的透射率为0或1。结合二元面板的设计思想,用误差扩散法对DMD各像素微镜的状态进行设计,用以对1053 nm脉冲光进行空间整形,实现了一种主动、实时的光脉冲空间整形方案。填充因子(FF)和光场调制度(FM)作为评价光束近场质量的参数,在高功率激光系统中直接影响系统的能量利用率。上述实验中,经过空间整形,光束的填充因子由33%提高为65%,光场调制度由52%降为28%,而且整形后的光斑大小与预期相符。最后对实验所用的DMD进行了能量利用率、波前畸变稳定性的测试。
The working principle of a digital micromirror device (DMD) is introduced. When a DMD is fixed at an angle of + 12 ° or -12 °, it is optically equivalent to controlling the pixel to transmit a transmittance of 0 or 1. Combined with the design idea of binary panel, the error diffusion method was used to design the state of each pixel micromirror in DMD to shape the 1053 nm pulsed light, which realized an active and real-time optical pulse space shaping scheme. Filling factor (FF) and light field modulation (FM), as the parameters to evaluate the beam near-field quality, directly affect the energy efficiency of the system in high-power laser systems. In the above experiment, after the space shaping, the filling factor of the light beam is increased from 33% to 65%, the modulation degree of the light field is reduced from 52% to 28%, and the size of the shaped spot is in accordance with the expectation. Finally, the experimental DMD was used to test the energy utilization and the stability of wavefront distortion.