Doppler-free spectroscopy using a continuous-wave optical frequency synthesizer.
A continuous-wave (cw) optical frequency synthesizer is demonstrated by using a monolithic-type cw optical parametric oscillator (cw-OPO) and an optical frequency comb. The cw-OPO is phase locked to an optical frequency comb that is phase locked to an atomic clock. The output frequency of the cw-OPO is frequency shifted with an electro-optic modulator, which makes it possible to tune the frequency continuously over 10 GHz. Furthermore, Doppler-free spectroscopy is performed using the optical frequency synthesizer for a cesium D1 line at 895 nm. The observed linewidth of 5 MHz is the natural linewidth of cesium. The center frequency of the line is consistent with a previous report.
Inaba
Hajime
H
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan. h.inaba@aist.go.jp
Ikegami
Takeshi
T
Hong
Feng-Lei
FL
Bitou
Youichi
Y
Onae
Atsushi
A
Schibli
Thomas R
TR
Minoshima
Kaoru
K
Matsumoto
Hirokazu
H