平顶高斯光束在失调光学系统中的传输特性

Transmission characteristics of flattened Gaussian beams passing through a misaligned optical system

为了研究平顶高斯光束经含失调窄缝光阑的失调光学系统的传输特性,采用广义衍射积分法和用有限个复高斯函数之和来逼近窄缝光阑孔径函数的方法,得出了输出光束场分布的近似解析公式,并针对给定的光学系统和平顶高斯光束进行了分析和数值模拟。结果表明,当光阑半宽度与光束束腰半宽度之比较大时(大于1),光学系统的失调量比光阑的失调量对输出光束特性影响更显著。这一结果对分析平顶高斯光束传输特性是有帮助的。

In order to study the transmission characteristics of flattened Gaussian beams passing through a misaligned optical system with a narrow slot aperture, the approximate analytical transmission equations of output light field distributions was derived adopting generalized diffraction formula and the approximate expansion equations of the narrow slot aperture. Consequently, the analysis and simulation in accordance with the preset optical system and flattened Gaussian beams was made. The result shows that influence of misalignments of optical system on the characteristics of the output light is more notable than misalignments of diaphragm＇ s when the ratio of half width of the aperture to half waist width of the flattened Gaussian beams is more than one. This method is helpful for the analysis of the transmission characteristic of flattened Gaussian beams.