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arXiv:1012.0772 · Optics Express

Intense ultra-broadband down-conversion from randomly poled nonlinear crystals

Jiŕí Svozilík, Jan Peřina

Published Dec 9, 2010• 13 citations
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Abstract

Randomly poled nonlinear crystals are shown to be able to emit intense ultra-broadband photon-pair fields with properties comparable to those coming from chirped periodically-poled crystals. Their intensities scale linearly with the number of domains. Also photon pairs extending over intervals with durations comparable to one optical cycle can be generated in these crystals.

DOI
10.1364/oe.18.027130

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Randomly poled nonlinear crystals are shown to be able to emit intense ultra-broadband photon-pair fields with properties comparable to those coming from chirped periodically-poled crystals. Their intensities scale linearly with the number of domains. Also photon pairs extending over intervals with durations comparable to one optical cycle can be generated in these crystals.
We describe properties of entangled photon pairs generated by spontaneous parametric down-conversion in periodically poled nonlinear crystals. These materials can serve as a useful bright source of photon pairs which properties can be tailored on demand. Especially photon pairs with broad spectra and sharp temporal features can be observed. Both uniform and chirped poling are considered. Spectral properties of the generated photons, photon fluxes, coincidence-count patterns in a Hong-Ou-Mandel interferometer, entropy of entanglement, as well as transverse profiles of intensities of the generated photon fields are discussed. Also the correlation area of two photons comprising a photon pair has been studied as it depends on parameters of periodical poling. Attention is also paid to structures with randomly distributed boundaries.
Abstract We have investigated the spectral properties and the multimode structure of joint states of photon pair produced by parametric down conversion in periodically poled nonlinear crystals (PPNC) by adding random length to each domain. We have also analysed the effect of additional random length on the output efficiency by considering two different configurations of PPNC and linear crystals, which we call (+, ‐) (PN) and (+, 0,−, 0) (PZNZ) configuration. In this paper we wish to study the effect of length fluctuations of segments which may occur in the preparation of PPNC in the laboratory. We aim at finding out how much error is reasonable in the process. In order to do this, we added random length to each segment and obtained the relevance between the output intensity and length fluctuations of the crystals.
Using a rigorous quantum model a comprehensive study of physical properties of entangled photon pairs generated in spontaneous parametric downconversion in chirped periodically poled crystals is presented. Spectral, temporal, as well as spatial characteristics of photon pairs are analyzed. Spectral bandwidths, photon-pair flux, and entanglement area can be effectively controlled by chirping. Quantification of entanglement between photons in a pair is given. Splitting of entanglement area in the transverse plane accompanied by spectral splitting has been revealed. Using the model temperature dependencies of the experimental intensity profiles reported in literature have been explained.