Abstract
We studied selective reflection (SR) of laser radiation from a window of a nanocell with thickness L ~ λ1,2/2 filled with Rb and Cs atoms, where λ1 = 780 nm and λ2 = 852 nm are the wavelengths resonant with the D2 laser lines for Rb and Cs, respectively. It is demonstrated that the negative derivative of the SR signal profile for L > λ/2 changes to the positive one for L < λ/2. It is shown that the real-time formation of the SR signal profile derivative (SRD) with the spectral width 30–40 MHz and located at the atomic transition is, in particular, a convenient frequency marker of D2 transitions in Rb and Cs. The amplitudes of SRD signals are proportional to the atomic transition probabilities. A comparison with the known saturated absorption (SA) method demonstrated a number of advantages, such as the absence of cross-over resonances in the SRD spectrum, the simplicity of realization, a low required power, etc. An SRD frequency marker also operates in the presence of the Ne buffer gas at a pressure of 6 Torr, which allowed us to determine the Ne–Rb collisional broadening, whereas the SA method is already inapplicable at buffer gas pressures above 0.1 Torr. The realization simplicity makes the SRD method a convenient tool for atomic spectroscopy. Our theoretical model well describes the SRD signal.
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Original Russian Text © E. Klinger, A. Sargsyan, C. Leroy, D. Sarkisyan, 2017, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 152, No. 4, pp. 641–649.
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Klinger, E., Sargsyan, A., Leroy, C. et al. Selective reflection of laser radiation from submicron layers of Rb and Cs atomic vapors: Applications in atomic spectroscopy. J. Exp. Theor. Phys. 125, 543–550 (2017). https://doi.org/10.1134/S1063776117090151
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DOI: https://doi.org/10.1134/S1063776117090151