title: Semi-automatic, octave-spanning optical frequency counter.
abstract: This work presents and demonstrates a semi-automatic optical frequency counter with octave-spanning counting capability using two fiber laser combs operated at different repetition rates. Monochromators are utilized to provide an approximate frequency of the laser under measurement to determine the mode number difference between the two laser combs. The exact mode number of the beating comb line is obtained from the mode number difference and the measured beat frequencies. The entire measurement process, except the frequency stabilization of the laser combs and the optimization of the beat signal-to-noise ratio, is controlled by a computer running a semi-automatic optical frequency counter.
authors.affiliation: Center for Measurement Standards, Industrial Technology Research Institute, 321, Sec.2, Kuang Fu Rd. Hsinchu,Taiwan 300, Republic of China. liutzean@itri.org.tw
authors.forename: Tze-An
authors.initials: TA
authors.lastname: Liu
authors.forename: Ren-Huei
authors.initials: RH
authors.lastname: Shu
authors.forename: Jin-Long
authors.initials: JL
authors.lastname: Peng
mesh_terms: D000465:Algorithms; D001331:Automation; D003201:Computers; D004867:Equipment Design; D004871:Erbium / Q000737:chemistry; D007455:Iodine; D007834:Lasers; D008027:Light; D015233:Models, Statistical; D055095:Optics and Photonics; D013997:Time Factors; D014887:Weather
chemical_list: D004871:Erbium; D007455:Iodine