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Low-loss waveguides fabricated in BK7 glass by high repetition rate femtosecond fiber laser

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Abstract

For the first time femtosecond-laser writing has inscribed low-loss optical waveguides in Schott BK7 glass, a commercially important type of borosilicate widely used in optical applications. The use of a variable repetition rate laser enabled the identification of a narrow processing window at 1MHz repetition rate with optimal waveguides exhibiting propagation losses of 0.3dB/cm and efficient mode matching to standard optical fibers at a 1550nm wavelength. The waveguides were characterized by complementary phase contrast and optical transmission microscopy, identifying a micrometer-sized guiding region within a larger complex structure of both positive and negative refractive index variations.

© 2008 Optical Society of America

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