Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 357, Issue 11-13, Pages 2387-2391Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2010.11.082
Keywords
Fused silica; Waveguide; Refractive index; Femtosecond laser; Repetition rate
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A new domain of optical waveguide writing with record high refractive index contrast (0.022) is reported in fused silica by strong focusing of a 522 nm wavelength, 500 kHz repetition rate femtosecond laser with oil-immersion optics. The strongly confining waveguide supports a mode of only 7 mu m mode field diameter at 1550 nm wavelength, opening the door for higher density integration in photonic circuits formed by femtosecond lasers. It is found that green and fundamental wavelengths have similar absorption in femtosecond laser waveguide writing in fused silica and that the advantage of the second harmonic is simply from an increased fluence through a smaller focal volume. (C) 2010 Elsevier B.V. All rights reserved.
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