Control of waveguide properties by tuning femtosecond laser induced compositional changes



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Hoyo Muñoz, Jesús del and Martínez Vázquez, Rebeca and Sotillo Buzarra, Belén and Teddy Fernández, Toney and Siegel, Jan and Fernández Sánchez, Paloma and Osellame, Roberto and Solís Céspedes, Francisco Javier (2014) Control of waveguide properties by tuning femtosecond laser induced compositional changes. Applied physics letters, 105 (13). 131101/1-131101/4. ISSN 0003-6951

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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 Δn 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.

Item Type:Article
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© 2014 AIP Publishing LLC. This work was partially supported by the Spanish Ministry Economy and Competitiveness (MINECO, TEC2011-22422, MAT2012-31959), J.H. and T.T.F. acknowledge funding from the JAE CSIC Program (pre- and post-doctoral fellowships, respectively, co-funded by the European Social Fund). B. Sotillo acknowledges her funding in the frame of CSD2009-00013 (MINECO).

Uncontrolled Keywords:Compositional changes; Waveguide properties
Subjects:Sciences > Physics > Materials
ID Code:29362
Deposited On:26 Mar 2015 14:45
Last Modified:07 Apr 2015 08:31

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