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Proceedings Paper

Direct laser written waveguide coupler with an optically tunable splitting ratio
Author(s): M. Ams; R. J. Williams; M. J. Withford
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Paper Abstract

The femtosecond laser direct-write technique was used to create a 2x2 single-mode waveguide coupler in Yb-doped borosilicate glass. Initial modelling demonstrates that a reversible change in splitting ratio at 800 nm of more than 20% is possible (i.e. 50:50 to 30:70) if a shift in refractive index of the order of 1×10-4 can be induced. Such a shift is expected to be achieved through resonant optical excitation at 976 nm of the ytterbium ions, which increases the refractive index through heating and the direct pumping of a saturable optical absorption.

Paper Details

Date Published: 11 February 2011
PDF: 5 pages
Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79250K (11 February 2011); doi: 10.1117/12.875959
Show Author Affiliations
M. Ams, Macquarie Univ. (Australia)
R. J. Williams, Macquarie Univ. (Australia)
M. J. Withford, Macquarie Univ. (Australia)


Published in SPIE Proceedings Vol. 7925:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI
Alexander Heisterkamp; Joseph Neev; Stefan Nolte, Editor(s)

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