Optical delay control of large spectral bandwidth laser pulses

In this Rapid Communication we report an experimental observation of temporal delay control of large- spectral-bandwidth multimode laser pulses by means of electromagnetically induced transparency. We achieved optically controllable retardation of laser pulses with an input spectral bandwidth of 3.3 GHz with limited temporal distortion and excellent values of the delay-bandwidth product. The experimental results compare favorably with a theoretical analysis.