Active Q switching of a fiber laser with a microsphere resonator

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27 Scopus citations


We propose and demonstrate an active Q-switched fiber laser using a high-Q microsphere resonator as the Q-switching element. The laser cavity consists of an Er-doped fiber as the gain medium, a glass microsphere reflector (coupled through a fiber taper) at one end of the cavity, and a fiber Bragg grating reflector at the other end. The reflectivity of the microsphere is modulated by changing the gap between the microsphere and the fiber taper. Active Q switching is realized by oscillating the microsphere in and out of contact with the taper. Using this novel technique, we have obtained giant pulses (maximum peak power ∼102 W, duration ∼160ns) at a low pump-power threshold (∼3 mW).

Original languageEnglish (US)
Pages (from-to)3568-3570
Number of pages3
JournalOptics letters
Issue number24
StatePublished - Dec 15 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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