Abstract
A scanning polarization interferometer designed for measuring first-order correlation functions is described. The interferometer utilizes a crystalline anisotropic medium with a controlled thickness. It requires almost no adjustment, has a rather simple design, and can be used to measure longitudinal-coherence time in the femtosecond range for both steady-state fields and ultrashort laser pulses. The results of measurements of first-order autocorrelation functions for radiation sources with a femtosecond coherence time are presented.
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