Diffraction characteristics of laser transmission
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摘要: 对激光发射系统内的衍射效应进行了模拟计算，利用菲涅耳衍射积分公式的二维傅里叶变换形式，并采用快速傅里叶变换计算方法，讨论了使用快速傅里叶变换计算时二次相位因子满足采样定理的条件，提出了适用于不同传输距离的计算方法，重点对初始光束强度调制对激光传输的影响进行了详细分析。Abstract: The diffraction effect of the laser emission system is simulated using the format of 2D Fourier transform of the Fresnel diffraction integral formula. The method of fast Fourier transform(FFT) is used to calculate diffraction integral formula, and the condition under which the secondary phase factor meets the sampling theory is discussed. Different methods applied to calculating the diffractive field of different transmission distance are proposed. The transmission effect of intensity modulation for input laser is analyzed.
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Key words:
- diffraction effect /
- Fresnel diffraction /
- fast Fourier transform /
- intensity modulation
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