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European Quantum Electronics Conference (EQEC)

Pulsed Lasing without Population Inversion in the Double-Lambda Scheme

R. Corbalán, J. Mompart, Ramon A. Vilaseca, E. Arimondo

Published Jan 1, 1996• 0 citations
Publisher
DOI
10.1109/eqec.1996.561672

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Summary form only given.It was shown recently that in the double-/spl Lambda/ scheme both cw and self-pulsing regimes can occur, and it is possible to move from one to another regime just by changing the intensity of the driving field or Q factor of the cavity. Although convincing lasing without inversion (LWI) was not achieved, lasing was realized essentially below the conventional threshold and inversionless gain was obtained. It is known that in general two different mechanisms of LWI appear and interfere each other in this scheme. The first mechanism is based on the phenomenon of the coherent population trapping and is connected to an excitation of the low-frequency coherence between two levels of the ground atomic state by bichromatic driving field. The second mechanism represents itself as a kind of resonant anti-Stokes Raman scattering of the driving-field into the lasing field and is associated with the low-frequency coherence induced between two levels of the excited atomic state. The main goal of this paper is to study the role, contribution, and interplay of these two mechanisms into the dynamical behavior of LWI. We study it both analytically and numerically on the basis of the corresponding set of the Maxwell-Bloch equations in the case of resonant driving.
The method of doubled pulses was used to achieve pulsed lasing due to the 5 d 10 6 p 2 P 3/2 —5 d 9 6 s 2 2 D 5/2 transition in the mercury ion (λ = 398 nm), similar to efficient lasing transitions in copper and gold atoms. Discharge tubes with inner diameters 4 and 8 mm and 30 cm long were used. They were filled with neon or helium as the buffer gases. There was a significant difference between lasing in the narrow and wide tubes. In the wide tube it was possible to observe lasing only when the delay between the pulses was short; the beam was not ring-shaped, contrary to what was found earlier for the narrow tube. Lasing was observed even when the delay between the two pulses was less than 5 μs, but lasing disappeared when heating of the tube became stronger as the pulse repetition frequency was increased. Possible population and inversion mechanisms were analysed.