基于电光调制提高静态傅里叶干涉具光谱分辨率的研究

在静态干涉系统中，采用电光调制可变折射率晶体LiNbO₃做静态傅里叶干涉具的材料，两侧分别加载相位相反的调制信号，从而在不改变静态傅里叶干涉具尺寸的条件下提高光谱分辨率。通过推导光程差函数与折射率调制度的函数关系，计算得在折射率调制度为0.030的条件下，比同尺寸干涉具光谱分辨率提高了16.7倍，达到2.836 cm-1。仿真结果表明折射率调制度会因波长增大而减小，光程差函数会随干涉位置的增大而产生偏大的现象。实际探测过程中，由于光谱范围500～1 100 nm相对较窄，波长变化造成的光谱探测失真不大，可以通过标定补偿，所以应用该方法可以有效地提高静态干涉系统的光谱分辨率。

Electro-Optic Modulation Based Study on Spectrum Resolution of Static Fourier Transform Spectrometer

In the static interferometer system,the variable refractive crystal LiNbO3 with electro-optic modulation was used in static Fourier transform interferometer,where both sides load phase opposite modulation signal separately so to raise the spectrum resolution in the same size of the instrument by the increment of optical path difference.According to the derivation of the optical path difference function with refraction modulation,the maximum optical path difference was calculated and the spectrum resolution ...