Features of the reference laser signal in the space-borne Fourier Transform Spectrometer

The laser reference path serves as the measure standard of the movable mirror displacement and velocity in Fourier Transform Spectrometer (FTS). In the Space-borne Imaging FTS, whose movable mirror is plane, it is also used to measure the tilt of the mirror. So, the quality of the laser interference signal plays an importance role in the instrument. This paper discusses and analyzes the features of the reference laser signal mainly according to the experiment results.