Intracavity absorption and emission spectroscopy of atoms in pulsed gas discharges
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Intracavity Absorption and Emission Spectroscopy of Atoms in Pulsed Gas Discharges V. I. Serdyukov, Yu. A. Poplavskii, and L. N. Sinitsa Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Akademicheskiі pr. 1, Tomsk, 634021 Russia Received October 27, 2008; in final form December 17, 2008
Abstract—Absorption and emission spectra of U and Na atoms in the 590nm spectral range were studied experimentally using pulsed hollowcathode gas discharges. The spectra were recorded with a highsensitivity intracavity laser spectrometer. The possibility of generating coherent emission on atomic emission lines in gasdischarge plasmas was demonstrated experimentally. PACS numbers: 52.70.Kz DOI: 10.1134/S1063780X09070058
1. INTRODUCTION Radiation and absorption atomic spectra not only provide information on the macroparameters of a medium, such as its density, but also allow one to study the fine structure and quantum properties of atomic gases and their mixtures. Intracavity laser (ICL) spec troscopy is an efficient method for measuring weak absorption [1]. The method is based on the selective contribution of absorption and emission to laser gen eration. This contribution is determined by the optical path length passed by radiation inside the cavity through the medium under study during a laser pulse. It is due to this property that ICL spectroscopy was used in this study to detect and experimentally investi gate spectra of pulsed discharges. More detailed infor mation on the principles of ICL spectrometry can be found in [2]. To record spectra of solidphase chemical ele ments, it is necessary to atomize them. For pure chemical elements, the dependences of their vapor pressures on the temperature are well known [3]. Chemical compounds are most efficiently atomized in gas discharges. During a short pulsed discharge, extremely high powers can be input in the discharge plasma, whereas in a continuous operating regime, such powers may damage or even destroy the discharge cell and its electrodes. A survey of experimental data on a hollow cathode discharge is given in [4], and the specific features of this type of discharge and its appli cation to lasers were considered in [5, 6]. In [7], results were presented from studies of the kinetics of the active media of pulsed lasers with a hollowcathode discharge. In that paper, the specific features of gener ation on the known laser transitions were explained and the parameters of IR transitions that were not pre viously observed were forecasted. A hollow cathode was used to excite the active medium of an HCN sub
millimeter molecular laser [8] and a Cd vapor laser [9], generating white light. In [10], the density of atoms in a nonequilibrium plasma was determined by a spectro scopic method with allowance for the gas temperature (in the temperature range of T = 300−6500 K and den sity range of 106–1014 cm−3). Spectra of pulsed hollowcathode discharges were studied in [11] using an ICL spectrometer. It was shown that, after the
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