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Title:TWO-PHOTON ABSORPTION SPECTROSCOPY OF RUBIDIUM WITH A DUAL-COMB TEQUNIQUE
Author(s):Nishiyama, Akiko
Contributor(s):Minoshima, Kaoru; Nakajima, Yoshiaki; Hariki, Takuya; Yoshida, Satoru
Subject(s):Instrument/Technique Demonstration
Abstract:
Dual-comb spectroscopies have great potential for high-resolution molecular and atomic spectroscopies, thanks to the broadband comb spectrum consisting of dense narrow modes\footnote{A. Nishiyama, S. Yoshida, Y. Nakajima, H. Sasada, K. Nakagawa, A. Onae, K. and Minoshima, Opt. Express 24, 25894 (2016).}. In this study, we apply the dual-comb system to Doppler-free two-photon absorption spectroscopy. The outputs of two frequency combs excite several two-photon transitions of rubidium\footnote{A. Hipke, S. A. Meek, T. Ideguchi, T.W. H\"{a}nsch, and N. Picqu\'{e}, Phys. Rev. A 90, 011805(R) (2014).}, and we obtained broadband Doppler-free spectra from dual-comb fluorescence signals. The fluorescence detection scheme circumvents the sensitivity limit which is effectively determined by the dynamic range of photodetectors in absorption-based dual-comb spectroscopies. Our system realized high-sensitive, Doppler-free high-resolution and broadband atomic spectroscopy._x000d_ \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.9]{figure5.eps} \end{wrapfigure}_x000d_ _x000d_ A part of observed spectra of 5S$_{1/2}$ - 5D$_{5/2}$ transition is shown in the figure. The hyperfine structures of the $\it {F"}$ = 1 - $\it{F'}$ = 3,2,1 transitions are fully-resolved and the spectral widths are approximately 5 MHz. The absolute frequency axis is precisely calibrated from comb mode frequencies which were stabilized to a GPS-disciplined clock._x000d_ _x000d_ This work was supported by JST through the ERATO MINOSHIMA Intelligent Optical Synthesizer Project and Grant-in-Aid for JSPS Fellows (16J02345).
Issue Date:6/22/2017
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/97166
DOI:10.15278/isms.2017.RI02
Date Available in IDEALS:2017-07-27


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