Fluorescence Spectroscopy of Rb Atoms with Two-Color Optical Near Fields for a High-Resolution Slit-Type Detector

Kouki TOTSUKA  Haruhiko ITO  Motoichi OHTSU  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.12   pp.2093-2096
Publication Date: 2002/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Near-Field Optics and Its Applications)
optical near field,  evanescent wave,  atom detection,  Rb atom spatial resolution,  

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We introduce stepwise resonant excitation by two-color optical near fields in order to detect Rb atoms with a slit-type detector. Blue fluorescence of the second D2 line is monitored for background-free detection. Feasibility of the method is shown from an experiment with a Rb vapor cell, where a sub-Doppler spectrum with the FWHM of 80 MHz is obtained. The detection efficiency is estimated at about 3% for cold Rb atoms.