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Известия Российской академии наук Серия физическая / Bulletin of the Russian Academy of Sciences Physics

Ultra-broadband biphoton fields in periodically poled photonic-crystal fibers

M. A. Smirnov

Published Jan 1, 2025• 0 citations
Publisher

Abstract

A new approach is considered that combines generation methods in optical fibers with a strongly modified dispersion profile and nonlinear crystals with periodic polarization. The results of numerical analysis showed the rich potential of such systems for generating quantum states for generating ultra-wideband states for two-photon microscopy applications.

DOI
10.7868/s3034646025120193

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A new approach is considered that combines generation methods in optical fibers with a strongly modified dispersion profile and nonlinear crystals with periodic polarization. The results of numerical analysis showed the rich potential of such systems for generating quantum states for generating ultra-wideband states for two-photon microscopy applications.
The generation of biphoton wave packets with a broad spectrum owing to quasi-phase-matched spontaneous parametric down-conversion in a crystal with an aperiodic poling has been considered. Biphotons at the exit of such a sample are not Fourier limited; i.e., their correlation time is much larger than the inverse width of the spectrum. It has been shown that if the inverse grating vector varies linearly along the sample length, the generated biphoton wave packets can be compressed in time by transmitting two-photon light through an optical fiber.
Collinear parametric scattering of light under type-II phase matching is considered in a periodic sequence of nonlinear cells made of BBO crystals. The possibilities of reducing the duration of the wave packets of biphotons and increasing their intensity under monochromatic pumping are studied. The analysis is based on the account of dispersion of the refractive indices using Sellmeier equations. The obtained results allow one to conclude that at an appropriate choice of the crystal thicknesses and the number of cells, it is possible to significantly increase the flux of broadband biphotons and obtain extremely short quantum packets. It is shown that for sufficiently small thicknesses of individual crystals (layers), this system exhibits a fine structure in the spectrum of biphotons: with an increase in the number of cells (layers) the broadband spectrum is divided into a number of narrow bands and the number of these bands increases. When use is made of a nonlinear BBO crystal, this method allows one to obtain ultrashort packets of biphotons with duration . Compared with a different method of generation of broadband biphotons, which is based on the use of quasi-phase-matched periodically poled crystals, the method studied in this paper does not necessitate the need for the phase modulation of a biphoton to be converted into the amplitude modulation.