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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Study of an observation method based on crossed polarizers for high-contrast coherent population trapping

Yuichiro Yano, Shigeyoshi Goka

Published Jul 1, 2013• 0 citations
Publisher

Abstract

In this paper, we propose an observation method based on crossed polarizers to obtain high-contrast coherent population trapping (CPT) resonance with parallel linearly polarized light (lin 11 lin field). Experimental results show that a high resonance contrast of 88.4 % can be observed using a133Cs gas cell and D1-line vertical-cavity surface-emitting laser (VCSEL).

DOI
10.1109/eftf-ifc.2013.6702055

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In this paper, we propose an observation method based on crossed polarizers to obtain high-contrast coherent population trapping (CPT) resonance with parallel linearly polarized light (lin 11 lin field). Experimental results show that a high resonance contrast of 88.4 % can be observed using a133Cs gas cell and D1-line vertical-cavity surface-emitting laser (VCSEL).
A method based on crossed polarizers to observe high-contrast coherent population trapping (CPT) resonance has been developed. Because crossed polarizers have a simple optical system, our method is suitable for chip-scale atomic clocks (CSACs). In CPT, the Faraday rotation in a linearly polarized light field (lin||lin) was calculated using two pairs of Λ-system models; the spectrum of the Faraday rotation is also estimated. After measuring the contrast and linewidth with the crossed-polarizer method, a comparison of the theoretical model and experimental data showed they were in good agreement. Moreover, the experimental results showed that a high contrast (88.4%) and narrow linewidth (1.15 kHz) resonance could be observed using a Cs gas cell and D1-line verticalcavity surface-emitting laser (VCSEL).
We investigated, theoretically and experimentally, the influence of the laser spectrum (in particular the linewidth) on the coherent population trapping (CPT) resonance in87Rb buffer gas cell. We investigated the case of linearly polarized laser fields. The experiments have been performed by using either a current-modulated vertical cavity surface emitting laser (VCSEL) or a phase-locked-laser (PLL) system. A model based on the density matrix approach has been used for the data interpretation. We found that, under experimental conditions suitable for compact clock applications, the fact that VCSELs have a broader spectrum than PLLs does not influence significantly the CPT signal amplitude. We demonstrate that a not negligible role is played by the destructive interference between different CPT excitation channels and propose further investigations to evaluate this contribution with respect to the other causes. Finally, we discuss the application of this scheme in compact atomic clocks.
We present an experimental and theoretical investigation of the coherent population trapping (CPT) resonance excited on the D1 line of 87 Rb atoms by bichromatic linearly polarized laser light. The experimental results show that a lin ‖ lin transition scheme is a promising alternative to the conventional circular—circular transition scheme for an atomic magnetometer. Compared with the circular light transition scheme, linear light accounts for high-contrast transmission resonances, which makes this excitation scheme promising for high-sensitivity magnetometers. We also use linear light and circular light to detect changes of a standard magnetic field, separately.