NDLI: Cs vapour cells: absorption and fluorescence may vary by several orders of magnitude

Content Provider	IEEE Xplore Digital Library
Author	Sarkisyan, D. Malakyan, Yu. Papoyan, A. Bison, G. Weis, A.
Copyright Year	2000
Description	Author affiliation: Inst. for Phys. Res., Ashtarak, Armenia (Sarkisyan, D.; Malakyan, Yu.; Papoyan, A.)
Abstract	We have studied the absorption and fluorescence of the D/sub 2/ line [6S/sub 1/2/(F=3,4)-6P/sub 3/2/(F=2,3,4.5)] in dilute Cs atomic vapour for 3 vapour cells: an extremely thin cell with a column length of 8 /spl mu/m, a 16.5 mm-long cell with pure Cs vapour, and a 10.4 mm-long Cs cell containing 40 Torr of Ne. A laser diode with a 20 MHz-linewidth and the maximum intensity of 40 mW/cm/sup 2/ was used. In order to have a comparable peak absorption (for the case of low laser intensity), the extremely thin cell was heated to /spl sim/100/spl deg/C. The effective absorption cross-sections of these cells versus laser intensity are shown. It is important to note that the same behaviour was observed for the resonance fluorescence. The effect of optical pumping of Zeeman sublevels, leads to a dramatically different behaviour of absorption for the /spl nu//sub 3/ and the /spl nu//sub 4/ transitions at a laser intensity /spl ges/0.1 mW/cm/sup 3/ and the absorption of /spl nu//sub 3/ is very sensitive to the presence of a weak external magnetic field. Meanwhile, there is no hint for this effect both for the extremely thin and the buffer gas-filled cells. The main reason which leads to the reduction of the Cs atom absorption versus laser intensity is the effect of the optical pumping of hyperfine levels. It is also obvious, that the longer the atom-radiation interaction time t is, the stronger the influence the effect of the optical pumping of hyperfine levels is. For the extremely thin cell, the time of flight between the two windows is only /spl sim/30 ns, which leads to frequent collisions of Cs atoms with the windows and thus provides a relaxation mechanism for the populations of the ground state hyperfine levels. We also found a dramatically different behaviour of the absorption and fluorescence for /spl nu//sub 3/ and /spl nu//sub 4/ when varying the rate (0.1-10 kHz) and direction of the frequency scan. A comparison with theoretical calculations is presented.
File Size	88871
File Format	PDF
ISBN	0780363183
DOI	10.1109/IQEC.2000.907907
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Absorption Fluorescence Pump lasers Atomic beams Ultraviolet sources Optical pumping Gas lasers Atom optics Diode lasers Resonance
Content Type	Text
Resource Type	Article

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