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We present experimental investigation on the fluorescence profiles observed by excitation of the hyperfine transitions of the second resonance line of potassium with a wavelength of 404.4 nm in dependence on the atomic density. This leads to both direct decay of the excited level population to the ground state (violet fluorescence), and to cascade decay via the first resonance lines (infrared fluorescence)...
An extremely thin cell (ETC) was used to analyse ground state effects of Cs atoms excited by laser light and placed in a magnetic field that was scanned around zero. The advantage of using the ETC is the possibility to separate the hf transitions, which are overlapped in ordinary cells, as a result of the spatial anisotropy of the atom-light interaction. Cs atoms were irradiated by circularly/linearly...
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...
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