Applied Physics B

, Volume 100, Issue 4, pp 847–850 | Cite as

Thermo-optical tuning of whispering gallery modes in Er:Yb co-doped phosphate glass microspheres

  • J. M. WardEmail author
  • S. N. Chormaic


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.


Pump Power Fibre Bragg Grating Tuning Range Phosphate Glass Whisper Gallery Mode 
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© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Applied Physics and InstrumentationCork Institute of TechnologyBishopstownIreland
  2. 2.Photonics CentreTyndall National InstituteLee MaltingsIreland
  3. 3.Physics DepartmentUniversity College CorkCorkIreland

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