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Springer series in optical sciences/SPringer series in optical sciences

Optical Coherent Transients by Laser Frequency-Switching

Richard G. Brewer, Azriel Z. Genack

Published Jan 1, 1976• 7 citations
Publisher
DOI
10.1007/978-3-540-37996-6_20

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Coherent transient amplification in inhomogeneously broadened rubidium atoms by diode-laser frequency switching

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Optics Letters•Jul 1, 1996•16 citations
We have observed optical free induction decay on the (3)H(6)(1) ? (3)H(4)(1) transition of Tm(3+) ions in LaF(3), using an external-cavity diode laser. The diode-laser frequency was switched by the application of a current step, and the resulting transient was detected by heterodyne beating with the laser at its new frequency. This provides a simple new way to measure coherent transients. The beat note shows a frequency chirp that gives a real-time measure of the diode-laser frequency. This result is attributed to changes in the laser lattice temperature on the microsecond time scale.
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 x 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.