Slow light by means of coherent population oscillations: laser linewidth effects

Giovanni Piredda, Robert W. Boyd
2007 Journal of the European Optical Society-Rapid Publications  
Several groups have recently reported the observation of slow light propagation speeds based on the process of coherent population oscillations (CPO) under conditions such that the laser line width exceeds the width of the CPO transparency window. We explain this apparently paradoxical result by noting that the CPO effect is sensitive only to intensity variations of the incident laser field that occur on time scales comparable to or shorter than the population relaxation time of the material
more » ... ium. Laser linewidths are associated primarily with phase fluctuations or with intensity fluctuations on much shorter time scales.
doi:10.2971/jeos.2007.07004 fatcat:6rz6om7egbcpdc5c6uvuavjr4m