About the role of phase matching between a coated microsphere and a tapered fiber: experimental study

Davor Ristić, Alphonse Rasoloniaina, Andrea Chiappini, Patrice Féron, Stefano Pelli, Gualtiero Nunzi Conti, Mile Ivanda, Giancarlo C. Righini, Gilles Cibiel, Maurizio Ferrari
2013 Optics Express  
Coatings of spherical optical microresonators are widely employed for different applications. Here the effect of the thickness of a homogeneous coating layer on the coupling of light from a tapered fiber to a coated microsphere has been studied. Spherical silica microresonators were coated using a 70SiO 2 -30HfO 2 glass doped with 0.3 mol% Er 3+ ions. The coupling of a 1480 nm pump laser inside the sphere has been assessed using a tapered optical fiber and observing the 1530-1580 nm Er 3+
more » ... 1580 nm Er 3+ emission outcoupled to the same tapered fiber. The measurements were done for different coating thicknesses and compared with theoretical calculations to understand the relationship of the detected signal with the whispering gallery mode electric field profiles.
doi:10.1364/oe.21.020954 pmid:24103968 fatcat:py6khepnyndb3esdwqmugcmpve