Abstract
We demonstrate the insertion of a micromirror into the core of a hollow
core photonic crystal fiber (HC-PCF). The micromirror is formed from a single
mode fiber that has been tapered to fit into the hollow core and fixed in
place using a fusion splicer. A large range of reflectivities higher than
4% was also achieved by silver-coating the silica tapered-fiber end-face using
thermal evaporation. The current micromirror provides two key advantages over
using a full-sized fiber splice to create a reflective interface. First, the
tapered fiber tip can be coated to increase the reflectivity without degradation
due to heating during the splicing process. Second, increased efficiency of
input and output coupling is possible because of improved mode-field overlap
with the fundamental mode of the HC-PCF. We show potential applications of
micromirrors for the formation of microcavities in hollow-core fibers and
for gas saturated absorption spectroscopy.
© 2011 IEEE
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