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The research on saturation of fast light in homogeneously broaden materials with gain

Qiu Wei Lü Pin Ma Ying-Chi Xu Xiao-Juan Liu Dian Zhang Cheng-Hua

The research on saturation of fast light in homogeneously broaden materials with gain

Qiu Wei, Lü Pin, Ma Ying-Chi, Xu Xiao-Juan, Liu Dian, Zhang Cheng-Hua
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  • Received Date:  09 November 2011
  • Accepted Date:  28 May 2012
  • Published Online:  05 May 2012

The research on saturation of fast light in homogeneously broaden materials with gain

  • 1. Department of Physics, Liaoning University, Shenyang 110036, China
Fund Project:  Project supported by the National Foundation in Advance of Liaoning University, China (Grant No. 2009LDGY06), the Liaoning University Doctor Star tup Fund of China, and the National Natural Science Foundation of China (Grant No. 10874062).

Abstract: According to the analysis of gain theory, the absorption or gain of medium depends on pump power. The coherent population oscillation leads the pulse to experience absorption saturation and propagation delay in a medium with absorption. This effect induces the pulse to experience gain saturation and propagation advance in a medium with gain. Making use of the transition rate equation of metastable state poplation, we develop the model of fast light in erbium-doped optical fiber and obtain the analytic expression of time advance. We demonstrate that there is a saturation effect of fast light in low frequency region, but the fast light is enhanced with pump power increasing in high frequency region.

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