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Solid State Communications

Superradiance and high-gain mirrorless laser activity of O−2-centers in KCl

Reinhold Florian, L.O. Schwan, Dankward Schmid

Published Apr 1, 1982• 79 citations
Publisher
DOI
10.1016/0038-1098(82)91028-6

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Estimate of the stimulated emission cross section of a four-level active medium from the kinetics of decay of its superradiance

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An analysis is made of the problem of kinetics of the superradiance decay in the case of nonlinear quenching of excited centers in four-level active media. A method is proposed for estimating the initial axial gain and of the stimulated emission cross sections of active media: it is based on a simultaneous analysis of the normalized superradiant flux and integrated population of the active medium. The proposed method is not sensitive to nonlinear quenching. A qualitative analysis is made of the decay of excitation in neodymium pentaphosphate crystals after pulsed excitation with laser radiation of the 0.538 μ wavelength and stimulated emission cross sections are estimated for the 4 F 3/2 → 4 I 11/2 transition in Nd 3+ resulting in lasing at 1.051 μ and at some other wavelengths of this transition.

Soviet Journal of Quantum Electronics•Sep 30, 1983•0 citations
Mirrorless lasers avoid cavity-pulling effects by generating stimulated emission directly from an atomic gain medium without an optical cavity. However, most superradiant or superfluorescent emissions are transient, limiting their use as steady atom-referenced optical sources. Here, we demonstrate a continuous-wave dual-wavelength mirrorless laser in thermal rubidium vapor. A frequency-stabilized 420 nm laser pumps the 5S1/2→6P3/2 transition and generates directional infrared lasing at 1323 and 1367 nm through the non-cascaded 6S1/2→5P1/2 and 6S1/2→5P3/2 transitions. The emissions exhibit threshold-like pump-power dependence and a near-fundamental transverse mode, supporting CW mirrorless laser in a traveling-wave atomic gain medium. Heterodyne detection gives a 1367 nm linewidth of 32.5 kHz, which is 38 times narrower than the natural linewidth. This work establishes a linewidth-narrowed, cavity-free, atom-referenced dual-wavelength laser platform for precision spectroscopy, optical frequency references, and quantum sensing.
An analysis is made of the problem of kinetics of the superradiance decay in the case of nonlinear quenching of excited centers in four-level active media. A method is proposed for estimating the initial axial gain and of the stimulated emission cross sections of active media: it is based on a simultaneous analysis of the normalized superradiant flux and integrated population of the active medium. The proposed method is not sensitive to nonlinear quenching. A qualitative analysis is made of the decay of excitation in neodymium pentaphosphate crystals after pulsed excitation with laser radiation of the 0.538 μ wavelength and stimulated emission cross sections are estimated for the 4 F 3/2 → 4 I 11/2 transition in Nd 3+ resulting in lasing at 1.051 μ and at some other wavelengths of this transition.