We report observation of coherent transient amplification that is due to free-induction decay and optical nutation in inhomogeneously broadened rubidium atoms by a sudden switch of diode-laser frequency. An amplification coefficient of 2.2 × 10-2 cm-1 is observed when the diode-laser frequency, initially tuned to the blue side of the Doppler-broadened absorption profile, is switched to be out of resonance by application of a step-function pulsed injection current. The transition from free-induction decay to optical nutation is observed and discussed.
© 1996 Optical Society of America
Yong-qing Li, W. H. Burkett, and Min Xiao, "Coherent transient amplification in inhomogeneously broadened rubidium atoms by diode-laser frequency switching," Opt. Lett. 21, 982-984 (1996)