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Saturation effects affecting absorption and fluorescence spectra of an atomic vapour confined in an extremely thin cell (cell thickness L< 1 mum) are investigated experimentally and theoretically. It is known that in a thin cell of dilute vapour, the wall-to-wall atomic trajectories generate original sub-Doppler signatures for spectra recorded under normal incidence.
We present a novel scheme for reducing the AC Stark effect in optical-microwave double-resonance spectroscopy and its application for efficient suppression of the light-shift-related instabilities in laser-pumped gas-cell atomic clocks. The method uses a multi-frequency pump light field that can be easily produced by frequency modulation of the single-frequency pump laser. We show theoretically that...
Coherent population trapping resonances at the D2 line of Cs are examined under the influence of constant and alternating magnetic fields. It is shown that electromagnetic fields as low as a few mG modify significantly the shape of the resonances, which can be used for electromagnetic field measurement
The availability of frequency stabilised laser sources is essential for the realisation of laser-pumped atomic clocks and other applications. Here we present a comparison of two simple spectroscopic schemes for laser stabilisation to the Rb D2 line transitions, based on linear (Doppler-broadened) and non-linear (saturated absorption) spectroscopy in thermal vapour cells, covering time scales up to...
Abstract. We investigate the coherent population trapping effect occurring between the Zeeman sublevels of a given hyperfine state of Cs when excited by a single-mode diode laser, which is frequency modulated in the kHzMHz range. In the presence of a dc magnetic field, simultaneous excitation of pairs of ground-state magnetic sublevels to common excited magnetic sublevels is performed. As a result,...
The optogalvanic signals (OGS) at the 667.8nm He line are investigated with low power diode lasers in a longitudinal hollow cathode discharge tube in pure He and in a He:Ne=1:1 gas mixture. A simple model for explaining the dependence of the OGS signal amplitude and sign on pressure is applied. The values obtained for the pressure where the OGS sign changes in pure He are in good agreement with the...
The use of diode lasers in research and technology is rapidly expanding due to their high efficiency, low cost and simplicity. Low-power diode lasers in the visible have been successfully used for investigation of the optogalvanic profiles of Ne and He transitions in hollow cathode discharge plasma. In this work the spatial distribution of the optogalvanic signal (OGS) in Ne at 667.8nm has been investigated...
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