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Optics Communications

The interaction between single-mode laser radiation and sodium vapour in a Fabry-Perot etalon and a ring optical cavity

W.E. Schulz, W. R. MacGillivray, M. C. Standage

Published Mar 1, 1983• 15 citations
Publisher
DOI
10.1016/0030-4018(83)90412-1

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Abstract Preliminary results are reported on the response of an intrinsic bistable system to the rapid switch-on of an injected light field. The bistable system consists of a linear array of 25 sodium atomic beams contained in a low finesse Fabry—Perot etalon. The beams are aligned perpendicular to the direction of propagation of the cavity field and are collimated sufficiently to resolve the D-line ground state 32S1/2 hyperfine structure. The etalon conditions are such that the cavity lifetime is an estimated 6 ns compared with the atomic lifetime of 16 ns; hence the system approaches the bad cavity limit in which the atom dynamics should be observable. The radiation from a single-mode ring dye laser is switched on to the bistable system in approximately 1 ns. Although preliminary results show low branch to high branch switching there is no evidence of the expected nutational oscillations.

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Optics Communications•Nov 1, 1992•23 citations
A study is presented of the transmission characteristics of low-finesse ring and Fabry-Perot optical cavities containing sodium vapor and operated below the threshold for optical bistability. Novel features are observed in the transmission signals obtained as the laser light frequency is swept through resonance with a sodium D transition. The ring cavity transmission peaks display a broad absorption profile except for the peak which is tuned to the center of the profile which is almost completely transmitted. A similarly tuned cavity transmission peak in the Fabry-Perot \'etalon is split into three, with the central peak being very narrow. A theoretical description for each cavity is developed in terms of a \ensuremath{\Lambda}-type, three-state model for the atomic energy levels associated with the transition. Using parameter values based on the experimental conditions, theoretical transmission signals for the linear cavity are obtained which are in good detailed agreement with the experimental results. For the ring cavity, agreement is also good except for the degree of absorption of the central peak.
Abstract Preliminary results are reported on the response of an intrinsic bistable system to the rapid switch-on of an injected light field. The bistable system consists of a linear array of 25 sodium atomic beams contained in a low finesse Fabry—Perot etalon. The beams are aligned perpendicular to the direction of propagation of the cavity field and are collimated sufficiently to resolve the D-line ground state 32S1/2 hyperfine structure. The etalon conditions are such that the cavity lifetime is an estimated 6 ns compared with the atomic lifetime of 16 ns; hence the system approaches the bad cavity limit in which the atom dynamics should be observable. The radiation from a single-mode ring dye laser is switched on to the bistable system in approximately 1 ns. Although preliminary results show low branch to high branch switching there is no evidence of the expected nutational oscillations.