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Laser Physics

Light shift manipulation and suppression in a double pass optical-magnetic double resonance system

Teng Wu, Xiang Peng, Hong Mei Guo

Published Aug 5, 2014• 4 citations
Publisher

Abstract

A double pass optical-magnetic double resonance system is proposed and applied for observing and manipulating the light shift in metastable . By adjusting the degree of overlap in space between the incident and retro-reflected laser beams, the manipulation on light shift is realized and a flat range for light shift insensitive to optical frequency detuning can be formed. A simple hole-burning model based on velocity-selective optical pumping, including the velocity diffusion effect caused by velocity-changing collisions, is adopted to qualitatively clarify the light shift observed in the double pass system.

DOI
10.1088/1054-660x/24/10/106001

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A double pass optical-magnetic double resonance system is proposed and applied for observing and manipulating the light shift in metastable . By adjusting the degree of overlap in space between the incident and retro-reflected laser beams, the manipulation on light shift is realized and a flat range for light shift insensitive to optical frequency detuning can be formed. A simple hole-burning model based on velocity-selective optical pumping, including the velocity diffusion effect caused by velocity-changing collisions, is adopted to qualitatively clarify the light shift observed in the double pass system.
We demonstrate an experimental scheme for studying the light shift effect in an optical magnetic double resonance system by using 4 He atoms. The dependences of the light shift caused by left- and right-circularly polarized laser light, respectively with laser frequency detuning and laser power are investigated, which show good agreement with theoretical analysis. Based on these, the above parameters are optimized in order to reduce light shift effect for a typical optical magnetic double resonance system.
We report a laser-pumped 4He atomic magnetometer with light shift suppression through the atomic sensor itself. A linearly polarized light is used to optically align the 4He metastable atoms and we monitor the magneto-optical double resonance (MODR) signals produced by the left- and right-circularly orthogonal components. It is shown that light shift leads to the atomic alignment to orientation conversion effect, and thus, the difference between the two MODR signals. One of these two MODR signals is locked at the Larmor frequency and is used to measure the ambient magnetic field, while the differential signal is, simultaneously, fed back to suppress the light shift. The scheme could be of the advantage to the design of compact magnetometers by reducing the systematic errors due to light shift.
We report a simple method to suppress the light shift in optical pumping systems. This method uses only frequency modulation of a radio frequency or microwave source, which is used to excite an atomic resonance, to simultaneously lock the source frequency to the atomic resonance and lock the pumping light frequency to suppress the light shift. We experimentally validate the method in a vapor-cell atomic clock and verify the results through numerical simulation. This technique can be applied to many optical pumping systems that experience light shifts. It is especially useful for atomic frequency standards because it improves long-term performance, reduces the influence of the laser, and requires less equipment than previous methods.
In this study, we investigate a compact double-resonance scalar magnetometer employing a single detuned elliptically polarized laser beam. A multipass cavity is incorporated to enhance the Faraday rotation signal. We observe asymmetric atomic response line shapes and resonance frequency shifts under non-collimated beam propagation through the vapor cell, and attribute these effects to light shifts. Experimental measurements of these light-shift effects are presented and show agreements with numerical simulations. Moreover, we demonstrate that this light shift can be significantly suppressed using a compensation method developed in our earlier work.
Optical manipulation of spin coherence in rubidium atoms is studied. The effect of off-resonant and circularly polarized light on optically induced magnetization is investigated. The change in precession frequency caused by the light-shift effect is verified. Absorption-free phase control of spin precession and pure spin rotation about an arbitrary axis are demonstrated. A theory of precession frequency shift that includes the effect of absorption is considered by using the density matrix and the experimental results are in agreement with the predictions of the theory. Thus, we show that it is possible to carry out off-resonant control of spin coherence and all-optical manipulation of spins.
Optical pumping performed with a quasi monochromatic laser beam in an atomic gas introduces a redistribution of Zeeman populations selectively in a single velocity class. In the limit of low pumping intensity the rate theory is valid for a description of velocity-selective optical pumping (V.S.O.P.). Well-defined atomic observables (population, orientation, alignment) and their velocity-correlated collisional relaxation can be studied. Also, a modified scheme for the detection of second order effects of optical pumping allows one to observe light shift induced signals. In particular, V.S.O.P. and its combination with modulated pumping, magnetic depolarization (level crossing), and magnetic resonance techniques provide information about the atomic collision characteristics such as collision rates and kernels for velocity-changing collisions.