Thermo-optical tuning of whispering-gallery modes in Er:Yb co-doped phosphate glass microspheres
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Ward, Jonathan M.
Nic Chormaic, Síle
We demonstrate an all-optical, thermally assisted technique for broad-range tuning of whispering gallery modes in microsphere resonators fabricated from an Er:Yb co-doped phosphate glass (IOG-2). The microspheres are pumped at 978 nm and the heat generated by absorption of the pump expands the cavity, thereby altering the cavity size and refractive index. We demonstrate a significant nonlinear tuning range of greater than 700 GHz of both C- and L-band cavity emissions via pumping through a tapered optical fibre. Finally, we show that large linear tuning up to ∼488 GHz is achievable if the microsphere is alternatively heated by coupling laser light into its support stem.
Microcavity and microdisk lasers , Mode locking , Whispering gallery modes
WARD, J. M. & NIC CHORMAIC, S. 2010. Thermo-optical tuning of whispering gallery modes in Er:Yb co-doped phosphate glass microspheres. Applied Physics B: Lasers and Optics, 100(4), 847-850. DOI: 10.1007/s00340-010-4153-0
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