SPATIAL COHERENCE SPECTROSCOPY AND ITS APPLICATIONS

摘要

Discovery of the Wolf effect, i.e. frequency change due to the source correlations (luring the propagation of radiation and its subsequent verification by experiments have been a subject of great interest in the past few years. Since the discovery of this effect, several investigations have been made in different areas of modern optics. This effect has also attracted great interest in interference experiments with partially coherent broacd bandwidth light. It has been shown that the state of coherence of the incident wave field over the plane of the double slit in Young's interference experiment leads to spectral changes in the region of superposition and the superposed spectrum shows a shift in the central frequency for a narrow band light and spectral modulations for a broad band light. Experimental confirmation of these theoretical predictions have already been made. It has also been shown that two beam interference in a Mach-Zehnder interferometer results in spectral changes in the form of spectral modulations in the superposed spectrum. Some applications of these studies in various measurements are discussed in detail.