孔栅斜置对远场的影响
Effect of hole grating gradient on farfield
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摘要: 应用光波叠加原理，通过数值计算方法，分析了孔栅斜置对远场测量的影响。结果表明：孔栅斜置带来附加位相差，导致了远场分布与通常的孔栅竖直放置的不同，给光强(从而功率、光束质量等)的测量带来系统误差。孔栅平面越偏离竖直面，影响越大，且对衍射级越大的光斑的影响也越大。在设计和使用孔栅时，应选取较小的偏离角；在进行功率、光束质量等参数诊断时应选取低级次的衍射斑。Abstract: With the help of wave theory of light, the effect of hole grating gradient on farfield is analyzed by numerical calculation in this paper. The results show that the systemic error of measurement of intensity(power, beam quality, etc. ) of farfield is definite, and the more the gradient is ,the more the diffractive grade is, the bigger the effect. The smaller gradient and diffractive grade should be chosen while using hole grating to diagnose the beam power and quality.
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Key words:
- highenergy laser(hel) /
- wavefront /
- hole grating /
- diffraction /
- gradient /
- beam quality
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