Open AccessNarrow linewidth laser system used for the intercombination transition spectrum measurement
Author(s) -
Feng Gao,
Hui Liu,
Peng Xu,
Yebing Wang,
Xin Tian,
Hong Chang
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.140704
Subject(s) - laser linewidth , strontium , optics , allan variance , laser , finesse , beat (acoustics) , physics , doppler effect , materials science , atomic physics , cavity ring down spectroscopy , fiber laser , standard deviation , fabry–pérot interferometer , statistics , mathematics , astronomy , nuclear physics
We observe the intercombination transition spectrum of alkaline-earth strontium, using a stable narrow 689 nm laser which is locked to a high fineness ultralow expansion reference cavity. The finesse is measured using cavity ring down techniques in different transverse modes of the cavity. Additionally, the response time of optical switch and PD monitor are taken into consideration in the measurement. Using a fiber-based optical frequency comb, the Allan deviation calculated from the counter value of the beat frequency shows a stability of 2.8× 10-13 in a 1 s averaging time. The saturation spectrum is measured with a minimum sub-Doppler width of 55 kHz. The high resolution intercombination transition spectrum can be used for absolute frequency stabilization.