Determination of absolute mode number using two mode-locked laser combs in optical frequency metrology.
The mode number of the comb line involved in the optical frequency measurement was determined using two mode-locked, erbium-doped fiber laser combs operated at different repetition rates independently of the frequency fluctuation of the laser under measurement (LUM). A simple measurement process is presented to determine the difference in mode number between the two laser combs and the comb mode number, yielding the absolute frequency of the LUM.
Peng
Jin-Long
JL
Center for Measurement Standards, 321, Section 2, Kuang Fu Road, Hsinchu 30042, Taiwan. jlpeng@itri.org.tw
Shu
Ren-Huei
RH