Abstract
We present experimental evidence obtained by a laser heterodyne technique for a chirp of about 1014 Hz/s in the cavity resonance during the pulse build-up time of a TEA CO2 laser. The frequency sweep arises from the refractive-index contribution of the time-dependent electron density in the exciting discharge plasma. The phenomenon provides a mechanism, previously unexplained, for the extended and asymmetric mode selection zone in injection experiments.
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