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Titanium-doped sputter-deposited AlN infrared whispering gallery mode microlaser on optical fibers

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Abstract

Optical fibers of 12μm diameter were coated with a sputter-deposited layer (4μm thick) of titanium (1 at. %)-doped amorphous aluminum nitride. When optically pumped by an Nd:YAG green laser at 532nm, laser action was observed in whispering gallery modes around the fiber (in a ring shape) at 780.5nm with a quality factor Q>1500. Other modes were also observed between 775 and 800nm. The primary and secondary modes give a mode separation of 4.6nm. No waveguide modes were observed in the cavity.

© 2010 Optical Society of America

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