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Physics Letters A

Theory of Doppler-free spectroscopy with λ-thick vapor cells

Aleksandr N. Naumov, Alexey A Podshivalov, Konstantin N. Drabovich, Richard B. Miles, Aleksei M. Zheltikov

Published Oct 1, 2001• 4 citations
Publisher
DOI
10.1016/s0375-9601(01)00617-x

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Atomic transitions of 85Rb and 87Rb isotopes in a strong transverse magnetic field with induction of up to 7 kG have been studied experimentally. High spectral resolution is achieved owing to the application of the linear Doppler-free spectroscopy method to a nanometric thin cell with the thickness of L = λ/2 = 390 nm, where λ is the wavelength of laser emission tuned to the resonance with the Rb D 2-line (λ/2-method). It has been observed that the number of atomic transitions in the transmission spectrum of linearly polarized (π) radiation decreases from 64 down to 20 transitions as the field strength increases above B > 5 kG. Four atomic transitions (two of 85Rb and two of 87Rb), which are forbidden in the absence of magnetic field, acquire significant strength in the strong magnetic field. Experimental results are in a good agreement with theory. Several practical applications of alkali-vapor-filled nanometric thin cells have been proposed.

Optics and Spectroscopy•Aug 1, 2015•4 citations
A simple model of the Voigt spectral profile is employed to analyze the influence of the sizes of a vapor cell on the shape of the spectral contour of the linear susceptibility. The width of a resonant spectral line observed in transmission and absorption spectra measured with such a vapor cell is shown to tend to the natural width as one of the sizes of the vapor cell approaches the wavelength of the spectral line, thus opening the way to extend the Romer- Dicke pillbox-cavity approach to microwave spectroscopy to the optical range. The possibility of using (lambda) -thick vapor cells, as well as one- and two-dimensional photonic band-gap structures for high resolution measurements is discussed.
Atomic transitions of 85Rb and 87Rb isotopes in a strong transverse magnetic field with induction of up to 7 kG have been studied experimentally. High spectral resolution is achieved owing to the application of the linear Doppler-free spectroscopy method to a nanometric thin cell with the thickness of L = λ/2 = 390 nm, where λ is the wavelength of laser emission tuned to the resonance with the Rb D 2-line (λ/2-method). It has been observed that the number of atomic transitions in the transmission spectrum of linearly polarized (π) radiation decreases from 64 down to 20 transitions as the field strength increases above B > 5 kG. Four atomic transitions (two of 85Rb and two of 87Rb), which are forbidden in the absence of magnetic field, acquire significant strength in the strong magnetic field. Experimental results are in a good agreement with theory. Several practical applications of alkali-vapor-filled nanometric thin cells have been proposed.