针对光纤傅里叶变换光谱仪(FFTS)中压电陶瓷非线性调制导致的复原光谱图畸变问题, 设计了 He-Ne 激光辅助干涉仪,利用该干涉仪实现被测光的 等光程间隔采样,以及为待测光源光谱定标提供依据。使用该干涉仪测量了632.8 nm He-Ne 激光光源的干涉信号,采用傅里叶变换算法计算了其光谱图,并与传统光栅光谱仪测量的光谱图进行比较, 分析了两者存在的差异及其原因,为 FFTS 的后续研制工作提供了有益参考。

A laser reference interferometer to eliminate the distortion of recovery spectrum caused by piezoelectric ceramic’s non-linear modulation in fiber Fourier transform spectrometer (FFTS) was desingned. It can offer equal sampling intervals for sampling tested source, and the basis calibration for the tested spectrum. The interference signal of 632.8 nm He-Ne laser is acquired by the fiber Michelson interfermeter (FMI). Fourier transform algorithm is used to calculate the spectrum. The difference between the spectrum acquired by the experiment and traditional grating spectrometer which can present helpful reference to develop FFTS further was also analyzed.