Direct laser written waveguide coupler with an optically tunable splitting ratio

M. Ams; R. J. Williams; M. J. Withford

doi:10.1117/12.875959

11 February 2011 Direct laser written waveguide coupler with an optically tunable splitting ratio

M. Ams, R. J. Williams, M. J. Withford

Proceedings Volume 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI; 79250K (2011) https://doi.org/10.1117/12.875959
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

M. Ams, R. J. Williams, and M. J. Withford "Direct laser written waveguide coupler with an optically tunable splitting ratio", Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79250K (11 February 2011); https://doi.org/10.1117/12.875959

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