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IEEE Transactions on Instrumentation and Measurement

Resonances of subnatural line width in iodine vapor driven by a polychromatic laser light field atλ=515 nm: a proposal

L. F. Vitushkin, S. V. Lazaryuk, S. A. Pulkin, L. Robertsson, G. I. Toptygina

Published Apr 1, 1995• 1 citation
Publisher

Abstract

An initial study of the characteristics of sub-natural line width resonances in iodine elicited by polychromatic laser light has been made. Results of theoretical calculations are presented. Under proper experimental conditions, super-narrow resonances with high contrast ran be expected.>
DOI
10.1109/19.377803

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Resonances with sub-natural line width in iodine vapour driven by a polyharmonic laser light field at λ=515 nm

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Narrow-band N-resonance formed in thin rubidium atomic layers

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Journal of Experimental and Theoretical Physics•Nov 1, 2012•7 citations

The Nature of the Iodine Line 2062a

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Dissociated iodine vapor at 1100\ifmmode^\circ\else\textdegree\fi{} to 1500\ifmmode^\circ\else\textdegree\fi{}C in a quartz tube failed to show any resonance fluorescence of the 2062 line in a 78 minute exposure in the same apparatus in which mercury vapor gave a detectable fluorescence of the 2537 line in a 1 second exposure. This fact and the narrowness of the 2062 line in absorption, seem to indicate that the lower level involved in the transition producing this line is not the normal state of the atom but is a slightly higher one. A calculation based on the observed line width shows that this level is probably at least 0.545 volt above the normal level and suggests that there may be a resonance line of atomic iodine at about 1800A.

Physical Review•Jun 1, 1925•4 citations
We demonstrate extremely narrow resonances for polarization rotation in an atomic vapor. The resonances are created using a strong control laser on the same transition, which polarizes the atoms due to optical pumping among the magnetic sublevels. As the power in the control laser is increased, successively higher-order nested polarization-rotation resonances are created, with progressively narrower linewidths. We study these resonances in the D 2 line of Rb in a room temperature vapor cell, and demonstrate a width of for the third-order rotation. The physical basis for the observed resonances is that optical pumping results in a simplified ΛV-type level structure with differential dressing of the levels by the control laser , which is why the control power has to be sufficiently high for each resonance to appear. This explanation is borne out by a density-matrix analysis of the system. The dispersive lineshape and subnatural width of the resonance lends itself naturally to applications such as laser locking to atomic transitions and precision measurements.
We demonstrate extremely narrow resonances for polarization rotation in an atomic vapor. The resonances are created using a strong control laser on the same transition, which polarizes the atoms due to optical pumping among the magnetic sublevels. As the power in the control laser is increased, successively higher-order nested polarization-rotation resonances are created, with progressively narrower linewidths. We study these resonances in the D-2 line of Rb in a room temperature vapor cell, and demonstrate a width of 0.14 G for the third-order rotation. The physical basis for the observed resonances is that optical pumping results in a simplified. AV-type level structure with differential dressing of the levels by the control laser, which is why the control power has to be sufficiently high for each resonance to appear. This explanation is borne out by a density-matrix analysis of the system. The dispersive lineshape and subnatural width of the resonance lends itself naturally to applications such as laser locking to atomic transitions and precision measurements. Copyright (c) EPLA, 2014
A new nano-cell with smoothly varying longitudinal thickness of the atomic vapour layer L in the range of 350 - 5100 nm allowing to study the resonant absorption of D1 and D2 lines of Cs atoms for thicknesses changing from L = Lambda/2 to L = 6 Lambda with the step of Lambda/2 (Lambda = 852 nm or 894 nm are the resonant laser wavelengths) and for different intensities is developed. It is revealed that for low laser intensities there is narrowing of the resonant absorption spectrum for the thicknesses L = (2n + 1)Lambda/2 (where n is an integer) up to L = 7Lambda /2 and broadening of the spectrum for L = n Lambda. For relatively high laser intensity (>1 mW/cm2), velocity selective optical pumping/saturated resonances of a reduced absorption (with the line-width close to the natural one), and centred on the hyperfine transitions occur when L = n Lambda. The possible application of these resonance peaks is given. The developed theoretical model describes well the experiment.
The narrow-band N-resonance formed in a Λ system of D 1-line rubidium atoms is studied in the presence of a buffer gas (neon) and the radiations of two continuous narrow-band diode lasers. Special-purpose cells are used to investigate the dependence of the process on vapor column thickness L in millimeter, micrometer, and nanometer ranges. A comparison of the dependences of the N-resonance and the electromagnetically induced transparency (EIT) resonance on L demonstrates that the minimum (record) thickness at which the N-resonance can be detected is L = 50 μm and that a high-contrast EIT resonance can easily be formed even at L ≈ 800 nm. The N-resonance in a magnetic field for 85Rb atoms is shown to split into five or six components depending on the magnetic field and laser radiation directions. The results obtained indicate that levels F g = 2, 3 are initial and final in the N-resonance formation. The dependence of the N-resonance on the angle between the laser beams is analyzed, and practical applications are noted.
Dissociated iodine vapor at 1100\ifmmode^\circ\else\textdegree\fi{} to 1500\ifmmode^\circ\else\textdegree\fi{}C in a quartz tube failed to show any resonance fluorescence of the 2062 line in a 78 minute exposure in the same apparatus in which mercury vapor gave a detectable fluorescence of the 2537 line in a 1 second exposure. This fact and the narrowness of the 2062 line in absorption, seem to indicate that the lower level involved in the transition producing this line is not the normal state of the atom but is a slightly higher one. A calculation based on the observed line width shows that this level is probably at least 0.545 volt above the normal level and suggests that there may be a resonance line of atomic iodine at about 1800A.