Abstract

A fiber laser is stabilized by introducing a calcium fluoride (CaF2) whispering-gallery-mode resonator as a filtering element in a ring cavity. It is set up using a semiconductor optical amplifier as a gain medium. The resonator is critically coupled through prisms, and used as a filtering element to suppress the laser linewidth. A three- cornered-hat method is used and shows a stability of 1011 after 10μs. Using the self-heterodyne beat technique, the linewidth is determined to be 13kHz. This implies an enhancement factor of 103 with respect to the passive cavity linewidth.

© 2010 Optical Society of America

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