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The Rydberg matter laser: excitation, delays and mode effects in the laser cavity medium

Journal article
Authors Shahriar Badiei
Leif Holmlid
Published in Applied Physics B-Lasers and Optics
Volume 81
Issue 4
Pages 549-559
Publication year 2005
Published at Department of Chemistry
Pages 549-559
Language en
Links <Go to ISI>://000231460800019
Keywords TIME-OF-FLIGHT, POTASSIUM PROMOTER, STIMULATED-EMISSION, COULOMB, EXPLOSIONS, RAMAN-SPECTROSCOPY, NEUTRAL DESORPTION, CATALYST SURFACE, EXCITED-STATES, ENERGY-RELEASE, IRON CATALYSTS
Subject categories Physical Chemistry

Abstract

Temporal and temperature effects are studied in Rydberg matter (RM) formed from K atoms and N-2 molecules as the active medium in a cavity. The function of this setup as a laser was recently described. Temperature-variation studies show that the photons re-exciting the RM clusters usually have a longer wavelength than the photons emitted in the stimulated emission process in the cavity. The deficit is probably covered by background photons. Very long time constants observed after emitter temperature changes indicate that long-wavelength photon energy is accumulated in the RM clusters. Long-wavelength modes are located farther from the RM emitter. The modal structure can be TEM01 or TEM00, as observed clearly by the spatial structure in rapid pulsing experiments. The in-cavity chopped beam signal is delayed by approximately 50 mu s. The initial growth rate of the signal during chopping is temperature dependent. Tailing is also observed by chopping, but rapid pulsing of the beam with a spinning mirror does not show any delay of the start of the lasing. The conclusion is that delays exist in the stimulated emission process. The broad intense band appearing at 11 000 nm is shown to be formed partly by light in the range 3500-5000 nm, probably by standing wave interaction at the grating surface (grating bands).

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