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Journal of Liaoning University

Controllable Group Velocity Based on Population Oscillation in Solid Medium at a Room Temperature

Xu Xiao-Juan

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

We reviewed the research of controllable group velocity based on coherent population oscillation in solid media at a room temperature.The phenomenon of spectral hole burning and the latest developments of the application in solid media were described.We emphatically discussed the physical principle and experiments of controllable group velocity in optical fibers.The significance of such research for science and applications were discussed.

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We reviewed the research of controllable group velocity based on coherent population oscillation in solid media at a room temperature.The phenomenon of spectral hole burning and the latest developments of the application in solid media were described.We emphatically discussed the physical principle and experiments of controllable group velocity in optical fibers.The significance of such research for science and applications were discussed.
The theoretical model and numerical simulations are established by the rate equation of thulium ion. Using the coherent population oscillation effect, we realize the controllable light velocity in the thulium doped fiber. We show that coherent population oscillations effect produces a very narrow spectral hole and anti-holes in the spectrum. The hole caused the amplitude modulation beam experience a large change of the group of refractive index, and makes us to achieve fast light propagation. Therefore, the pump intensity can be used as a control parameter to increase the fractional advance. In addition, we can confirm that the larger input intensity can lead to large time advancement, and saturation phenomenon of fast light exists in low frequency.
Group velocity of the optical pulse propagation would be reduced based on coherent population oscillation effect in an absorbing medium. According to the absorption properties of erbium-doped optical fiber, there would appear a sharp absorption loss, which brought more difficulties to the actual measurement of slow light and its application in communications. From the ground rate equation of erbium-ion, the delay of optical pulse was simulated under controllable absorption loss， and experiments were implemented to verify the theoretical results. Moreover, we researched how the different pump power and fiber length effect the signal loss and the optical pulse delay.
Starting with a concise historical introduction to EIT,CPO and SBS methods,this article gives a comprehensive review to the advances in the research of controllable fast and slow light,with the emphasis on the history,physical principle,and experiments of slow light via coherent population oscillation approach,which is effective in the realization of ultraslow light at the room temperature.The article also discusses the problems and difficulties existing in the application of controllable fast and slow light.