Abstract
We have measured the temporal change of spatial coherence of a copper vapor laser (CVL) beam with an unstable resonator by a reversal shear interferometer and a streak camera. By this method, we can evaluate the temporal change of the spatial coherence function from a single-shot measurement. We have observed stepwise increase of the coherence width at intervals equal to the transit time of the resonator. The values of the first, second and third plateaus were 5 mm, 6.7 mm and 13 mm, respectively, when an unstable resonator of magnification factor 60 was used. Moreover we have verified the result by a theoretical calculation on the basis of a passive resonator model.
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