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Journal of Physics B Atomic Molecular and Optical Physics

K(6S-4P) parametric emission excited by bound-bound transitions of NaK

Stoyan Dinev, Georgi Borislavov Hadjichristov, Ivan L. Stefanov

Published Nov 28, 1989• 2 citations
Publisher

Abstract

The authors have studied extensively the stimulated emission at 691.1 nm and 693.9 nm identified as 6S-4P 1/2 , 3/2 transitions in potassium. The origin of the emission is thought to be four-wave parametric emission induced by hybrid transitions. The stimulated emission is enhanced by cascading transitions, the presence of nearby atomic states, stimulated electronic Raman scattering and molecular background signal. Excitation, absorption and emission measurements indicate that bound-bound NaK(X-B) transitions play a dominant role. The rate of energy transfer NaK to K is evaluated as k ET approximately=2.3*10 -9 cm 3 s -1 .

DOI
10.1088/0953-4075/22/22/025

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The Journal of Chemical Physics•Mar 3, 2017•1 citation
The authors have studied extensively the stimulated emission at 691.1 nm and 693.9 nm identified as 6S-4P 1/2 , 3/2 transitions in potassium. The origin of the emission is thought to be four-wave parametric emission induced by hybrid transitions. The stimulated emission is enhanced by cascading transitions, the presence of nearby atomic states, stimulated electronic Raman scattering and molecular background signal. Excitation, absorption and emission measurements indicate that bound-bound NaK(X-B) transitions play a dominant role. The rate of energy transfer NaK to K is evaluated as k ET approximately=2.3*10 -9 cm 3 s -1 .
An enhanced two-photon emission has been observed between the 6S and the 4S levels of potassium. The priming field is the stimulated electronic Raman emission at 2720 cm-1due to scattering of ruby laser radiation from the4P_{3/2}state in potassium. The intense emission at the complementary frequency ω2is close to the 5P → 4S resonance lines. As a result, the coupling coefficient has a resonance character that is favorable for the enhancement. The observed results are compared with a simple analysis. The relation of the enhanced emission with two-quantum absorption, stimulated Raman effect, and parametric four-photon processes is discussed.
Strong stimulated cascade emission and coherent four-wave parametric radiations are observed. By proper observation of the excitation spectra, the cascade emission and the coherent four-wave mixing parametric processes can be identified. The effect of the buffer gas pressure on the intensity and the pulse compression of the emitted radiation were investigated. Cascade inversionless coherent radiation emission with absorption reduction and third order nonlinear susceptibility enhancement due to the presence of a strong internally generated field are discussed for the 4p–4s strong emission observed.
We report observations of 4‐wave and 6‐wave mixing processes based upon two‐photon pumping of the potassium 4S→6S and 4S→4D transitions in a sodium‐potassium mixture. Additionally we observe coherent emissions at the potassium 3D→4P transition frequencies for pump wavelengths between 725 and 760 nm. The excitation spectra for these emissions show several broad peaks, each of roughly 10 nm width. A series of sharp dips is superimposed on the most intense peak due to depletion of the 3D population by laser‐induced absorption to Rydberg F levels. Although the 3D→4P emissions can be observed in both the forward and backward directions, they are ∼50 times more intense in the forward direction. We believe the forward emission is primarily due to 6‐wave mixing while the backward emission can most likely be attributed to amplified spontaneous emission following two‐photon molecular photodissociation. However, at present, the exact mechanisms responsible for these 3D→4P emissions are not fully understood.
Stimulated and enhanced two-photon emissions from excited states in potassium have been observed. This emission is primed by stimulated electronic Raman radiation generated by scattering of a giant pulse ruby radiation. Four-photon parametric processes also take place. The two processes can be distinguished by tuning the laser frequency. Most of the emitted radiations are plane-polarized. A pumping model is proposed explaining the required population inversions and the polarization properties of the radiations.
Stimulated emission (SE) induced by pulsed two-photon excitation of the 6p′[1/2]0, 6p′[3/2]2, 7p[1/2]0, 7p[3/2]2, and 7p[5/2]2 states of the Xe atom has been studied. Spectra of SE were recorded in the 800–3500 nm region, which covers the 6p′, 7p → 7s (2500–3500 nm), 6p′, 7p → 5d (1000–2000 nm), 7s → 6p (1200–1900 nm) transitions, as well as the near-IR 6p → 6s (800–1000 nm) transitions. It is shown that excitation of the 7p states results in radiative cascade via the 7s states, 7p → 7s → 6p, although at least one case of cascading via the 5d states is also observed. Spectra of SE induced by excitation of the 6p′ states are dominated by the 6p′ → 6s′ transitions in the near IR and the 6p′ → 5d[1/2]1 → 6p[1/2]1 → 6s[3/2]1 cascade; the 6p′ → 7s → 6p cascade is also observed, although the secondary 7s → 6p emission is rather weak in comparison with excitation of the 7p states.