Abstract With a coupling laser locked to caesium 6S$_{1 / 2}$ $F_{\rm g}$=4--6P$_{3 / 2}$ $F_{\rm e}$=5 cycling transition and a co-propagating probe laser scanned across 6S$_{1 / 2}$ $F_{\rm g}$=4--6P$_{3 / 2}$ $F_{\rm e}$=3, 4 and 5 transitions, a novel scheme for sub-Doppler spectra in Doppler-broadened V-type three-level system is demonstrated by detecting the transmission of the coupling laser through a caesium vapour cell. The Autler--Townes doublet in the sub-Doppler spectra of the coupling laser is clearly observed. The effects of coupling laser intensity on the splitting and linewidth of the Autler--Townes doublet are experimentally investigated and the results agree well with theoretical predictions. Taking the multiple hyperfine levels of caesium atom into account, a brief analysis is presented.
Received: 07 July 2005
Revised: 30 September 2005
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60578018, 10434080 and 10374062),by the Key Scientific Program of Education Ministry of China (Grant No 204019), and by the Research Funds for Youth Academic Leaders of Shanxi Province, China.
Cite this article:
Wang Yan-Hua (王彦华), Yang Hai-Jing (杨海菁), Du Zhi-Jing (杜志静), Zhang Tian-Cai (张天才), Wang Jun-Min (王军民) Autler--Townes doublet in novel sub-Doppler spectra with caesium vapour cell 2006 Chinese Physics 15 138
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