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Elimination of pump-induced frequency jitter on fiber-laser frequency combs



John J. McFerran, William C. Swann, Brian R. Washburn, Nathan R. Newbury


Optical frequency combs generated by femtosecond fiber lasers typically exhibit significant frequency noise that causes broad optical linewidths, particularly in the comb wings and in the carrier-envelope offset frequency (fceo) signal. We show these broad linewidths are mainly a result of white amplitude noise on the pump diode laser that leads to a breathing-like motion of the comb about a central fixed frequency. By a combination of passive noise reduction and active feedback using phase-lead compensation, this noise source is eliminated, thereby reducing the fceo linewidth from 250 kHz to <1 Hz. The in-loop carrier-envelope offset phase jitter, integrated to 100kHz, is 1.3 rad.
Optics Letters


fiber lasers, frequency combs, optical metrology


McFerran, J. , Swann, W. , Washburn, B. and Newbury, N. (2006), Elimination of pump-induced frequency jitter on fiber-laser frequency combs, Optics Letters, [online], (Accessed May 22, 2024)


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Created June 30, 2006, Updated October 12, 2021