Changes in longitudinal spatial coherence length of optical field in image space
The laws of variation in the length of spatial longitudinal coherence (LC) and the width of the LC interference pulse of the optical field of an extended spatially incoherent source are established in the image space behind a collecting lens that occurs in the output arm of the scanning (oscillating-mirror) Michelson interferometer. The LC length (and the interference pulse width) varies nonmonotonically and exhibits a local minimum, the magnitude and position of which on the longitudinal axis of the system are determined by the source size and position and depend on the lens aperture diameter.
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