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Optics Express

Doppler-free dual-comb spectroscopy of Rb using optical-optical double resonance technique

Akiko Nishiyama, Satoru Yoshida, Yoshiaki Nakajima, Hiroyuki Sasada, Ken’ichi Nakagawa, Atsushi Onae, Kaoru Minoshima

Published Oct 28, 2016• 54 citations
Publisher

Abstract

transitions of Rb at 1530 nm and precisely determined the absolute frequencies of the transitions, with an uncertainty of less than 1 MHz. The variations of the OODR spectral line shapes due to power broadening and alignment and the effects of polarization on the dual-comb OODR spectra were also analyzed. This study provides a widely applicable technique for Doppler-free dual-comb spectroscopy of various gaseous species.

DOI
10.1364/oe.24.025894

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transitions of Rb at 1530 nm and precisely determined the absolute frequencies of the transitions, with an uncertainty of less than 1 MHz. The variations of the OODR spectral line shapes due to power broadening and alignment and the effects of polarization on the dual-comb OODR spectra were also analyzed. This study provides a widely applicable technique for Doppler-free dual-comb spectroscopy of various gaseous species.
We demonstrate the spectra of 87Rb 5S1/2 - 5P3/2 - 4D3/2 transitions by utilizing the double-resonance optical-pumping (DROP) and optical-optical double-resonance (OODR) techniques, respectively. The DROP spectrum, compared with the traditional OODR spectrum, show a much better signal-to-noise ratio (SNR). Paying special attention to the influence of alignment of lasers where the coupling and probe beams are counter-propagation and co-propagation on DROP spectrum, so as to further narrow the spectral width by means of electromagnetically induced transparency (EIT). When -the frequency of 1.5μm fiber-pigtailed butterfly-type distributed-feedback (DFB) diode laser is stabilized to the DROP spectrum of 87Rb 5P3/2 - 4D3/2 transition, the preliminary result of residual frequency jitter after stabilization is ~ ±1.3 MHz within 60 s.
We present the observation of the Rb two-photon spectrum directly excited by an Er:fiber laser comb in a hot atomic vapor system. The influences of the atomic velocity distribution on direct and sequential two-photon transitions are discussed respectively and a combination of corresponding spectral control techniques is developed to eliminate the Doppler broadening background. A direct frequency comb spectroscopy is obtained with high-resolution two-photon transition lines. These techniques would benefit spectroscopy measurement in hot atomic vapor systems, and pave the way for establishing a high-stability optical frequency comb in 1.5 $\ensuremath{\mu}$m optical communication bands based on the Rb two-photon transitions.
We demonstrate the spectra of 87Rb 5S1/2-5P3/2-4D3/2(4D5/2) transitions by utilizing the double-resonance optical-pumping(DROP) and optical-optical double-resonance(OODR) techniques,respectively.The DROP spectrum,compared with the traditional OODR spectrum,shows a much better signal-to-noise ratio(SNR) and narrower linewidth.When frequency of 1 529 nm external-cavity diode laser is stabilized to the DROP spectrum of 87Rb 5P3/2(F′=3)-4D3/2(F″=3) transition,the preliminary result of residual frequency jitter after being locked is～0.65 MHz within 300 s.This result is clearly much better than that in case of frequency stabilized by using OODR scheme(～1.8 MHz within 300 s).