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Soviet Journal of Quantum Electronics

Resonances in the emission spectrum of a broadband laser containing a strongly absorbing atomic medium in a magnetic field

А. П. Войтович, О. Е. Костик, В. В. Машко

Published May 31, 1992• 0 citations
Publisher

Abstract

An investigation was made of the lasing characteristics of a dye laser with a resonator containing potassium vapor of high optical density in a longitudinal magnetic field. Output power resonances, tunable by the magnetic field, were discovered within absorption dips in the lasing spectrum. The tuning rates of the resonances and their separation from the centers of the transitions exceeded tens of times the corresponding Zeeman splitting values of the absorption lines.

DOI
10.1070/qe1992v022n05abeh003477

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Trans Black Sea Region Symposium on Applied Electromagnetism•Nov 11, 2002•0 citations
An investigation was made of the lasing characteristics of a dye laser with a resonator containing potassium vapor of high optical density in a longitudinal magnetic field. Output power resonances, tunable by the magnetic field, were discovered within absorption dips in the lasing spectrum. The tuning rates of the resonances and their separation from the centers of the transitions exceeded tens of times the corresponding Zeeman splitting values of the absorption lines.
An explanation has been found for the resonances which form in absorption dips in the output power of a wideband laser with an amplitude-anisotropic resonator containing a strongly absorbing atomic medium in a magnetic field. These resonances are caused by rotation of the polarization plane of the light in the medium. It is suggested that these resonances be used to measure high optical densities of media. This method has been used to experimentally determine the optical density of potassium vapor at the frequencies of the resonance doublet at various temperatures.
An experimental investigation was made of the spectral and energy characteristics of the radiation emitted by a dye laser with a ring resonator containing an absorbing medium (potassium vapor) in which an anisotropy was induced by a strong external optical wave. Narrowing of the dye output radiation to about 10???2 nm and locking of the emission spectrum to one- and two-photon absorption lines of the potassium vapor were observed. An investigation was made of the locking efficiency for different polarizations of the strong wave.
Lasing was achieved in barium vapor near an absorption line at the λ = 553.5 nm wavelength corresponding to the 61S0–61P1 resonance transition. Barium vapor produced in an arc discharge was placed in the resonator of a dye laser having a stimulated emission spectrum of ~ 5 pm half-width. In the presence of additional weak broad-band radiation, the lasing spectrum consisted of two components symmetric relative to the center of the absorption line. This lasing was due to stimulated Raman scattering by a population grating and was most efficient in regions where the difference between the frequencies of the strong and weak fields coincided with the Rabi frequency. A quantitative comparison was made between theory and experiment on amplification without population inversion in a two-level system. Holographic interference spectroscopy was used to study experimentally the behavior of the susceptibility (the absorption coefficient and the refractive index) under conditions of resonant interaction. Good agreement was obtained between the behavior of the dispersion of the refractive index and the theoretical dependence. The highest gains were kv ≈ 10 cm −1 when the barium atomic concentration was N ≈ 5 × 1016 cm −3.
A high-Q resonator and linear polarization of the output radiation are assumed. Calculations are made of the contributions of the real and imaginary parts of the nonlinear polarizability of an absorbing medium in the resonator to each of the parameters governing the output intensity (loss factor, saturation parameter) and detuning of the output frequency from the natural frequency of the resonator (coefficients describing effects of the mode pushing and pulling type). The results are reported of an experimental determination of the output power at the wavelength of an absorption line as a function of the intensity of the applied magnetic field and it is shown that these results agree well with the calculations.
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.
Summary form only given, as follows. We investigated the hidden alignment of Ne plasma in a magnetic field observing the optical characteristics of the medium-absorption and refraction. A tunable single frequency laser beam was used as a probe beam. Depending on the direction of the applied magnetic field and the geometry of observation, the dependence of the plasma birefringence or dichroism on the magnetic field was registered. The dye laser was tuned to /spl lambda/=607.4 nm (2p/sub 3/-1s/sub 4/ Ne transition). The dependence on the external magnetic field of the laser beam intensity passed through the Ne discharge cell was registered, for various laser frequencies in the limits of the absorption line. At the edge of the absorption line, the signal of the dichroism consists of two Lorentzian components while at the center of the absorption line the wide component is absent. The wide component width depends on neon pressure as: H(P)=(1.64/spl plusmn/0.03) gauss + P(torr) (0.33/spl plusmn/0.08) gauss/torr. This value is in a good agreement with other results concerning the lifetime of the 1s/sub 4/ state. The mechanism of alignment formation in this state is not clear. This state could not be aligned by light absorption following a quantitative calculation. The irradiation of atoms is isotropic within the limits of all the absorption line because of the high magnitude of absorption for the 1s/sub 4/-1s/sub 0/ transition. We consider the optical pumping as the most probable mechanism for alignment of this state. The magnitude of absorption on the s-p neon transitions are not high. The intensity of the spontaneous emission beam along the tube is greater than in the perpendicular direction. If the quantization axis coincides with the tube axis, this beam empties the magnetic sublevels with M=/spl plusmn/1, thus creating longitudinal alignment. The absence of a signal at the center of the absorption line can be explained by the high selfabsorption on the s-p transitions. The width of the narrow component of the signal is approximately 0.7 gauss. Its pressure dependence is small. We have established experimentally the absence of signals of such width in the spontaneous emission from 2p levels. Hence, all optical mechanisms of alignment transmission from higher or from lower states to the 1s/sub 4/ state are excluded. Apparently this signal arises from alignment of metastable state 1s/sub 5/. In our opinion the collisions are the most probable mechanism of alignment transmission.