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Soviet Journal of Quantum Electronics

Stimulated emission of the 535 nm thallium line as a result of quasiresonant optical pumping of a Tl–He mixture by radiation from a recombination He–Ca laser

S. N. Atamas, L. M. Bukshpun, Yu V Koptev, Evgeny L. Latush, Miroslav F. Sem

Published Feb 28, 1984• 5 citations
Publisher

Abstract

Stimulated emission of the 535 nm line of thallium was observed when a Tl-He mixture was pumped optically in the violet wing of a pressure-broadened resonance line of thallium at 377.6 nm by a recombination He–Ca laser emitting at λ = 373.7 nm. Pumping resulted from the absorption transitions between repulsive terms of the Tl-He quasimolecule. The average stimulated radiation power reached 5 mW when the pulse repetition frequency was 6 kHz. The efficiency of conversion of the useful part of the pump pulse was 45%.

DOI
10.1070/qe1984v014n02abeh004672

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Stimulated emission of the 535 nm line of thallium was observed when a Tl-He mixture was pumped optically in the violet wing of a pressure-broadened resonance line of thallium at 377.6 nm by a recombination He–Ca laser emitting at λ = 373.7 nm. Pumping resulted from the absorption transitions between repulsive terms of the Tl-He quasimolecule. The average stimulated radiation power reached 5 mW when the pulse repetition frequency was 6 kHz. The efficiency of conversion of the useful part of the pump pulse was 45%.
Results of experiments investigating the influence of resonance radiation trapping on the power and efficiency of the atomic thallium photodissociation laser are reported. Transverse pumping of a thallium iodide cell with added free metallic thallium has enabled conversion efficiencies from the ArF laser pump beam of greater than 7% to be achieved on a single Tl laser transition at λ 535.0 nm. Collisional deexcitation of the 72S1/2 upper laser level imposes a limit on the TlI densities which can be employed.
We present the results of an experimental study of a Tl vapour/Ar mixture as an active medium. Under optical excitation of thallium to the 6d 2 D 3/2 state, we have achieved lasing at λ = 1.3 μm (7p 2 P 0 1/2 — 7s 2 S 1/2 transition) and 535 nm (7s 2 S 1/2 — 6p 2 P 0 3/2 ) through cascade transitions from the 6d 2 D 3/2 state to the upper laser levels. The electron deexcitation rate of the 6p 2 P 0 3/2 metastable state is no slower than 1.5×10 -8 cm 3 s -1 , meaning that this process cannot prevent self-terminating laser action at the 7s 2 S 1/2 — 6p 2 P 0 3/2 transition under electron-beam pumping at pulse repetition rates up to 100 kHz.
Frequency conversion of cw CO 2 laser radiation to the 276.8 nm ultraviolet range was achieved in a mixture of thallium and cesium vapor by parametric mixing with radiation from a rhodamine 6G dye laser. Two-photon resonance of the pump radiation with the 6 P 1/2 –7 P 3/2 forbidden transition and the proximity of the converted radiation frequency to the frequency of the 6 D 3/2 –7 P 3/2 transition in the thallium atom were utilized. Cesium vapor was used to match the refractive indices of the interacting waves.
The results are reported of investigations into the spectral and energy characteristics of a thallium photodissociation laser, emitting due to the 7S/sub 1/2/--6P/sub 3/2/ (lambda = 535 nm) and 7S/sub 1/2/--6P/sub 1/2/ (lambda = 337.6 nm) transitions. The experiments were performed using two types of resonator, and this made it possible to increase the radiation power density above the superradiance level and to operate in two-wavelength lasing regimes. On reaching a certain power density the structure of the laser emission spectrum changed, the nature of this change being different for the different lines. A discussion of the results obtained is given.
Pulsed stimulated emission near the D2 line of 133Cs (852.1 nm) was obtained from a semiconductor laser with an external selective element utilizing specular reflection from a cesium vapor cell. The power and spectral width of the stimulated emission at a vapor pressure of 2 Torr were 1 mW and 5×10−3 nm, respectively. Investigations were made of the spectral and temporal characteristics of the laser radiation at different cesium vapor pressures. An analysis was made of the conditions needed to enhance substantially the average stimulated emission power. The possibility of using a laser with an external selectively reflecting cell for optical pumping of alkali metal vapors is discussed. The resonance absorption lines of rubidium and potassium were recorded using a pulsed injection laser.