分划板失调对猫眼光学系统反射特性的影响

为了研究猫眼光学系统中分划板失调对入射光束的反射特性影响,考虑光学元件的等效光阑作用,将失调光阑孔径函数展开为有限项复高斯函数之和,利用失调光学系统的广义衍射公式,推导出入射光束经含分划板失调猫眼光学系统的反射光束场分布的近似解析式,得到反射光束场分布与入射光束光学参量、分划板孔径尺寸和分划板失调量之间的关系,对特定猫眼光学系统定量分析了分划板失调对反射光束场分布的影响。结果表明,分划板失调对反射光束场分布产生影响,特别是对远场光场分布影响显著。

Fast spectrum recovery of nonlinear optical path difference interferogram in photoelastic modulator

In order to improve the efficiency of spectrum recovery of nonlinear optic path difference in a photoelastic modulator(PEM), nonuniform fast Fourier transform (NUFFT) was applied to spectrum recovery of nonuniform sampling interferogram. The result of algorithm simulation shows that the average error of PEM spectrum recovery based on NUFFT with 1024 points is 0.87%, and the speed is improved 20 times. The result of simulation proves that the NUFFT can achieve fast and high precision spectrum recovery in PEM and also gives a reference for designing and implementing based on hardware.