0463443 - FZÚ 2017 RIV GB eng J - Journal Article
Peřina Jr., J. - Haderka, Ondřej - Allevi, A. - Bondani, M.
Internal dynamics of intense twin beams and their coherence.
Scientific Reports. Roč. 6, Feb (2016), 1-8, č. článku 22320. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR GAP205/12/0382
Institutional support: RVO:68378271
Keywords : dynamics of intense * twin beams * pump-depleted parametric * down-conversion * coherence
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 4.259, year: 2016

The dynamics of intense twin beams in pump-depleted parametric down-conversion is studied. A generalized parametric approximation is suggested to solve the quantum model. Its comparison with a semiclassical model valid for larger twin-beam intensities confirms its applicability. The experimentally observed maxima in the spectral and spatial intensity auto- and cross- correlation functions depending on pump power are explained in terms of different speeds of the (back-) flow of energy between the individual down-converted modes and the corresponding pump modes. This effect is also responsible for the gradual replacement of the initial exponential growth of the down-converted fields by the linear one. Furthermore, it forms a minimum in the curve giving the effective number of twin-beam modes. These effects manifest a tight relation between the twin-beam coherence and its internal structure, as clearly visible in the model.
Permanent Link: http://hdl.handle.net/11104/0262638