期刊
APPLIED PHYSICS LETTERS
卷 105, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4896846
关键词
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资金
- Spanish Ministry Economy and Competitiveness (MINECO) [TEC2011-22422, MAT2012-31959]
- JAE CSIC Program
- European Social Fund
- MINECO [CSD2009-00013]
Local compositional changes induced by high repetition rate fs-laser irradiation can be used to produce high performance optical waveguides in phosphate-based glasses. The waveguide refractive index contrast is determined by the local concentration of La, which can be changed by the action of the writing laser pulses. In this work, we have investigated the degree of control that can be exerted using this waveguide writing mechanism over the cross-section of the guiding region, and the local refractive index and compositional changes induced. These variables can be smoothly controlled via processing parameters using the slit shaping technique with moderate Numerical Aperture (NA 0.68) writing optics. The combined use of X-ray microanalysis and near field refractive index profilometry evidences a neat linear correlation between local La content and refractive index increase over a broad Delta n interval (>3 x 10(-2)). This result further confirms the feasibility of generating efficient, integrated optics elements via spatially selective modification of the glass composition. (C) 2014 AIP Publishing LLC.
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