Temporal and spatial coherence characteristics of light based on Michelson interferometer
Using the Michelson interferometer,with a photodetector and a fiber spectrometer,the time domain and spectral signal were measured respectively.With the help of spectral signal,the a-lignment of interference light path and the optical path difference between two arms were adjusted,and then white light interference could be quickly located.The optical delay scanning near the zero op-tical path difference point was carried out to measure the interference waveform in time domain and obtain the coherence length of the light source.The white light LED source was matched with a varie-ty of bandpass filters to measure and compare the coherence length of light sources with different spec-tral widths.A variable diaphragm was used to limit the luminescence scale of the extended light source.By analyzing the contrast ratio variation of the interference fringe along with the luminescence scale,the spatial coherence could be demonstrated and measured.
万方数据
维普
