Abstract
Spatial and spectral coherence of high-intensity twin-beam states propagating from the near-field to the far-field configurations is experimentally investigated by measuring intensity auto- and cross-correlation functions. The experimental setup includes a moving crystal and an iCCD camera placed at the output plane of an imaging spectrometer. Evolution from the tight near-field spatial position cross-correlations to the far-field momentum cross-correlations, accompanied by changeless spectral cross-correlations, is observed. Intensity autocorrelation functions and beam profiles are also monitored as they provide the number of degrees of freedom constituting the down-converted beams. The strength of intensity cross-correlations as an alternative quantity for the determination of the number of degrees of freedom is also measured. The relation between the beam coherence and the number of degrees of freedom is discussed.
Highlights
We mention that investigations of the far-field spectral correlations depending on pump-field parameters have been performed by using imaging spectrometers combined with EMCCD cameras[16]
The nonlinear crystal can be translated in the opposite direction with respect to the spectrometer, so that the object plane of the optical system is made to coincide with the output face of the crystal itself, with the far-field-like configuration (z = 0 mm) and with all the planes in between
Spatial and spectral coherence of high-intensity twin beams propagating from the near field to the far field has been experimentally studied by measuring intensity AC and XC functions, providing a complete characterization of the propagating twin beam
Summary
We mention that investigations of the far-field spectral correlations depending on pump-field parameters (power) have been performed by using imaging spectrometers combined with EMCCD cameras[16] Their behavior in the transition from near field to far field has not been experimentally addressed yet. The nonlinear crystal can be translated in the opposite direction with respect to the spectrometer, so that the object plane of the optical system is made to coincide with the output face of the crystal itself (near field, z = 24 mm), with the far-field-like configuration (z = 0 mm) and with all the planes in between This system allows us to measure both spatial and spectral intensity correlations simultaneously, providing the overall picture of the evolving twin beam. The numbers of degrees of freedom are obtained from AC measurements which completes the picture of the evolving twin beam
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