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

0449792 - FZÚ 2016 RIV US eng C - Conference Paper (international conference)
Allevi, A. - Lamperti, M. - Machulka, R. - Jedrkiewicz, O. - Brambilla, E. - Gatti, A. - Peřina Jr., J. - Haderka, Ondřej - Bondani, M.
Effects of pump depletion on spatial and spectral properties of parametric down-conversion.
Quantum optics and quantum information transfer and processing 2015. Bellingham: SPIE, 2015 - (Banaszek, K.; Silberhorn, C.), "950508-1"-"950508-7". Proceedings of SPIE, 9505. ISBN 978-1-62841-626-8. ISSN 0277-786X.
[Quantum Optics and Quantum Information Transfer and Processing 2015. Praha (CZ), 15.04.2015-16.04.2015]
R&D Projects: GA ČR GAP205/12/0382
Institutional support: RVO:68378271
Keywords : parametric down conversion * coherence * Fedorov ratio * Schmidt decomposition
Subject RIV: BH - Optics, Masers, Lasers

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.
Permanent Link: http://hdl.handle.net/11104/0251232