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

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Abstract

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 250kHz to <1Hz. The in-loop carrier-envelope offset phase jitter, integrated to 100kHz, is 1.3rad.

© 2006 U.S. Government

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