9:00 AM - 9:15 AM
[23a-D315-1] Accurate Spatial Coherence Measurement with a Temporally Modulated Double Slit
Keywords:Spatial coherence measurement, DMD, Young's interference experiment
We proposed previously a method of measuring the spatial coherence of light by means of temporal modulation of a double slit displayed on a digital micromirror device (DMD), and showed that this technique is generally insensitive to background light. In this study, we demonstrate theoretically and experimentally that the visibility of the reproduced interference fringe pattern can be enhanced by modulating either one of the two slits. This feature enables one to measure the spatial coherence of light more accurately, especially for low-visibility (i.e., low spatial coherence) light.