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Optics Communications

Observation of superluminal and slowdown light propagation in doped lithium niobate crystals

Feng Gao, Jingjun Xu, Haijun Qiao, Qiang Wu, Yin Xu, Guoquan Zhang

Published Aug 3, 2005• 9 citations
Publisher
DOI
10.1016/j.optcom.2005.07.032

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The light amplification mechanism of fanning noise in doped lithium niobate crystals was analyzed and the light amplification competition between the signal beam and the fanning noise was discussed. Results show that, due to the light amplification competition between the signal beam and the fanning noise, there exists an optimum photovoltaic field in doped lithium niobate crystals and an optimum pump intensity for the light amplification of signal beam. With such optimum conditions, the signal beam can be amplified maximally while the fanning noise is very weak.
We study the spectral correlation of photon pairs generated via type-II spontaneous parametric down conversion in periodically poled lithium niobate crystals. By performing Schmidt decomposition on the two-photon wavefunction, we calculate the spectral purity of the two-photon state under various pump laser characteristics and doping concentrations of MgO in lithium niobate crystals. Our results show that periodically poled 5% MgO doped lithium niobate is a good candidate to generate photon-pairs with high spectral purity at telecom wavelength.
Multimode spectro-temporal non-Gaussian quantum states of light play a crucial role in continuous-variable quantum information processing. In particular, the non-Gaussian quantum states generated through a single-photon addition (SPA) to multimode quantum fields at telecommunication wavelengths constitute a useful resource for quantum technologies. We present a detailed theoretical analysis and numerical simulations of single-photon addition (SPA) and mode-selective single-photon addition (MSSPA) to a multimode quantum field at telecommunication wavelengths. The analysis is performed for congruently grown lithium niobate (LN), 5%5\%5% MgO-doped lithium niobate (MgO:LN) and various concentrations of ZnO-doped lithium niobate (ZnO:LN) bulk crystals. We investigate MSSPA using type-II parametric down-conversion (PDC) and SPA using the type-I PDC processes. We further present spectro-temporal mode-selective SPA at the telecom wavelength using 5%5\%5% MgO:LN for temperatures ranging from 0∘C0^\circ C0∘C to 15∘C15^\circ C15∘C. In addition, we perform simulations to investigate SPA based on the noncollinear type-I PDC configuration. These theoretical results identify optimal experimental conditions and phase-matching parameters to achieve SPA and mode-selective SPA for LN-based crystals, providing a potential platform for non-Gaussian quantum state engineering at telecommunication wavelengths, mainly at 155015501550 nm.