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Soviet Journal of Quantum Electronics

Profiles of infrared lines of potassium vapor under multiphoton resonance excitation conditions

Yu. M. Kirin, Yu. N. Popov, Sergei G Rautian, Vladimir P. Safonov, B. M. Chernobrod

Published Feb 28, 1974• 2 citations
Publisher

Abstract

An investigation was made of the infrared emission spectra of potassium vapor illuminated with giant ruby laser pulses and with the Stokes component of the stimulated Raman scattering of these pulses in nitrobenzene. These emission spectra were recorded after conversion to visible light in a nonlinear crystal. It was found that the dependences of the intensities, widths, and shifts of the infrared lines on the vapor pressure of potassium had extrema. The broadening and shift were induced by the field. The results obtained indicated a considerable importance of six-photon parametric processes in the emission of infrared potassium lines.

DOI
10.1070/qe1974v004n02abeh006710

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An investigation was made of the infrared emission spectra of potassium vapor illuminated with giant ruby laser pulses and with the Stokes component of the stimulated Raman scattering of these pulses in nitrobenzene. These emission spectra were recorded after conversion to visible light in a nonlinear crystal. It was found that the dependences of the intensities, widths, and shifts of the infrared lines on the vapor pressure of potassium had extrema. The broadening and shift were induced by the field. The results obtained indicated a considerable importance of six-photon parametric processes in the emission of infrared potassium lines.
An experimental investigation was made of the interaction of ruby laser radiation with a vapor of thallium atoms. Several atomic lines in the infrared range were observed and investigated for the first time. These lines were due to multiphoton excitation of the thallium atoms. The dependences of the energies of the infrared emission lines on the intensity of the exciting laser radiation indicated that they appeared because of multiphoton ionization of the atoms. Nonresonant stimulated Raman scattering involving electronic transitions between the 6P1/2 and 6P3/2 levels in the thallium atom was observed and studied. The polarization of the infrared emission lines and of the Raman lines was investigated as a function of the polarization of the exciting laser radiation. The energy efficiency of infrared conversion was ~10−5 %.
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.
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.
An experimental investigation was made of the broadening of the D lines and of the two-photon absorption line (4S1/2–6S1/2) of potassium vapor subjected to ruby laser radiation. A dye laser beam was used as a probe and this made it possible to record simultaneously all three absorption lines. The measurements were carried out for different polarizations and geometries of the exciting and probe radiations. The observed broadening was attributed to the high-frequency Stark effect in the strong field of the incident wave.
We report on an investigation of simultaneous generation of several narrow-bandwidth laser-like coherent emissions from nitrogen molecular ions ( ) produced in intense mid-infrared laser fields. With systematic examinations on the dependences of coherent emissions on gas pressure as well as several laser parameters including laser intensity, polarization and wavelength of the pump laser pulses, we reveal that the multiple coherent emission lines generated in originate from a series of nonlinear processes beginning with four-wave mixing, followed with stimulated Raman scattering. Our analyses further show that the observed nonlinear processes are greatly enhanced at the resonant wavelengths, giving rise to high conversion efficiencies from the infrared pump laser pulses to the coherent emission lines near the transition wavelengths between the different vibrational energy levels of ground X and that of the excited B states.