It is well known that optical twin-beam states (TWB) generated by spontaneous parametric down-conversion (PDC) exhibit spatial and spectral correlations, which can appear in single-shot images obtained by using an imaging spectrometer to resolve emission angles and wavelengths simultaneously. By analyzing series of singleshot images recorded by an EMCCD camera at different powers of the pump beam, we studied the evolution of several quantities characterizing the generated TWB. In particular, we demonstrated that correlation widths in spectrum and space increase monotonically at low pump powers and then start decreasing at higher powers due to the onset of pump depletion. In a complementary way, the Fedorov ratio decreases and then increases again. At the same time, the number of modes evaluated from photon statistics follows a complementary behavior to correlation widths that can be interpreted in terms of the evolution of the number of Schmidt modes in the field.

Effects of pump depletion on spatial and spectral properties of parametric down-conversion

ALLEVI, ALESSIA;LAMPERTI, MARCO;JEDRKIEWICZ, OTTAVIA;BRAMBILLA, ENRICO;GATTI, ALESSANDRA CARLA;BONDANI, MARIA
2015-01-01

Abstract

It is well known that optical twin-beam states (TWB) generated by spontaneous parametric down-conversion (PDC) exhibit spatial and spectral correlations, which can appear in single-shot images obtained by using an imaging spectrometer to resolve emission angles and wavelengths simultaneously. By analyzing series of singleshot images recorded by an EMCCD camera at different powers of the pump beam, we studied the evolution of several quantities characterizing the generated TWB. In particular, we demonstrated that correlation widths in spectrum and space increase monotonically at low pump powers and then start decreasing at higher powers due to the onset of pump depletion. In a complementary way, the Fedorov ratio decreases and then increases again. At the same time, the number of modes evaluated from photon statistics follows a complementary behavior to correlation widths that can be interpreted in terms of the evolution of the number of Schmidt modes in the field.
2015
Quantum Optics and Quantum Information Transfer and Processing 2015
9781628416268
Quantum Optics and Quantum Information Transfer and Processing 2015
Prague; Czech Republic
15 April 2015 through 16 April 2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2027282
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