Effects and Control of the Correlation Properties of Light Sources

摘要

Several topics associated with the influence and control of the statisticalproperties of light are investigated. One topic is the modification of the observed spectrum by the correlation properties of a partially coherent secondary source. Source correlations that violate a certain scaling condition give rise to a normalized spectrum in the far zone that is different from the normalized spectrum of the light at the source. Statistical correlations can give rise to frequency shifts in the spectrum observed in the far field if the correlation function of the emitted radiation does not satisfy the scaling condition. A Fourier achromat is used to generate a secondary source in which the degree of spatial coherence is independent of wavelength; i.e., it violates the scaling condition. The spectrum detected in the far zone of the secondary source is displaced in frequency and distorted relative to the spectrum measured at the secondary source. The displacement depends on the direction of observation. A new method generates partially coherent sources with controllable correlation. Experiments described the feasibility of synthesizing source correlations for use in spectral modulation applications. The secondary source with controlled correlation uses an interferometric optical system designed and constructed around a general spectral filter. The degree of spectral coherence is directly related to the passboard of the filter. The calculation of the correlation properties of synchrotron radiation is made. The second-order statistical properties of synchrotron radiation resulting from a three-dimensional relativistic electron bunch in a storage ring are calculated. Theses. (JHD)