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Proceedings Paper

Effects of pump depletion on spatial and spectral properties of parametric down-conversion
Author(s): Alessia Allevi; Marco Lamperti; Radek Machulka; Ottavia Jedrkiewicz; Enrico Brambilla; Alessandra Gatti; Jan Peřina Jr.; Ondřej Haderka; Maria Bondani
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Paper 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.

Paper Details

Date Published: 7 May 2015
PDF: 7 pages
Proc. SPIE 9505, Quantum Optics and Quantum Information Transfer and Processing 2015, 950508 (7 May 2015); doi: 10.1117/12.2178469
Show Author Affiliations
Alessia Allevi, Univ. degli Studi dell'Insubria (Italy)
Marco Lamperti, Univ. degli Studi dell'Insubria (Italy)
Radek Machulka, Palacký Univ. Olomouc (Czech Republic)
Ottavia Jedrkiewicz, Institute for Photonics and Nanotechnologies, CNR (Italy)
Enrico Brambilla, Univ. degli Studi dell'Insubria (Italy)
Alessandra Gatti, Institute for Photonics and Nanotechnologies, CNR (Italy)
Jan Peřina Jr., Palacký Univ. Olomouc (Czech Republic)
Ondřej Haderka, Joint Lab. of Optics of Palacký Univ. and Institute of Physics of AS CR (Czech Republic)
Maria Bondani, Institute for Photonics and Nanotechnologies, CNR (Italy)

Published in SPIE Proceedings Vol. 9505:
Quantum Optics and Quantum Information Transfer and Processing 2015
Konrad Banaszek; Christine Silberhorn, Editor(s)

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