Abstract

We have observed optical free induction decay on the ${ }^3{H}_6(1){\to }^3{H}_4(1)$ transition of ${\mathrm{Tm}}^{3+}$ ions in LaF₃, 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.

© 1997 Optical Society of America

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