7 May 2015 Effects of pump depletion on spatial and spectral properties of parametric down-conversion
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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 single-shot 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.
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Alessia Allevi, Alessia Allevi, Marco Lamperti, Marco Lamperti, Radek Machulka, Radek Machulka, Ottavia Jedrkiewicz, Ottavia Jedrkiewicz, Enrico Brambilla, Enrico Brambilla, Alessandra Gatti, Alessandra Gatti, Jan Peřina, Jan Peřina, Ondřej Haderka, Ondřej Haderka, Maria Bondani, Maria Bondani, "Effects of pump depletion on spatial and spectral properties of parametric down-conversion", Proc. SPIE 9505, Quantum Optics and Quantum Information Transfer and Processing 2015, 950508 (7 May 2015); doi: 10.1117/12.2178469; https://doi.org/10.1117/12.2178469
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