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Chinese Physics Letters

Optical Amplification and Slow Light Based on Two-Wave Mixing at Large Modulation Depth

掌蕴东, 叶建波, 邱巍

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

基于 Kukhtarev “ s 方程，我们导出 intensity-couplingcoefficient，联合阶段的系数和全体的组速度的公式调整深度。它 istheoretically 证明信号横梁能在通过 photorefractivecrystal 和归结为 m/s 的组速度以后被放大，甚至 cm/s。同时，我们也分析热刺激率和大信号在 photorefractive 在光扩大和 reductionof 光繁殖上完成的 influenceof 二波浪的混合。

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基于 Kukhtarev “ s 方程，我们导出 intensity-couplingcoefficient，联合阶段的系数和全体的组速度的公式调整深度。它 istheoretically 证明信号横梁能在通过 photorefractivecrystal 和归结为 m/s 的组速度以后被放大，甚至 cm/s。同时，我们也分析热刺激率和大信号在 photorefractive 在光扩大和 reductionof 光繁殖上完成的 influenceof 二波浪的混合。
Based on Kukhtarev's equations, we derive the formulae of intensity-coupling coefficient, the phase-coupling coefficient and the group velocity at large modulation depth. It is theoretically shown that the signal beam can be amplified after passing through the photorefractive crystal and the group velocity reduced to m/s, even cm/s. Meanwhile, we also analyse the influence of the thermal excitation rate and the large signal effects on optical amplification and reduction of light propagation in photorefractive two-wave mixing.
In the demonstrations of slow light in photorefractive (PR) materials, the delays are only reported for long pulse durations (ms to s) that are in discrepancy with typical ns-pulse length in data processing applications. Here we demonstrate that the slowdown of light in a PR crystal can be also achieved in the nanosecond regime at room temperature. We experimentally show that the use of a pulsed laser with a high peak intensity may indeed reduce the Sn2P2S6{\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{S}}_{6}Sn2​P2​S6​ crystal response time to a scale of ns and achieve a two-wave mixing (TWM) gain of $7.9\phantom{\rule{4pt}{0ex}}{\text{cm}}^{\ensuremath{-}1}$. We show the slowdown of light pulses whose duration ranges from 10 to 100 ns with a fractional delay up to 0.3. These results are similar to those obtained in optical fibers, except that the slow light with PR TWM is achieved through smaller propagation lengths and at wide wavelength ranges. This could reveal potential applications of PR slow light systems and have a significant impact for future optical communications systems.