Láseres integrados en dobles tungstatos y niobato de litio basados en guías de onda ridge

Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física de Materiales. Fecha de lectura: 23-10-201

Ultrafast direct laser writing of cladding waveguides in the 0.8CaSiO3-0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

We report on tubular cladding optical waveguides fabricated in Neodymium doped Wollastonite-Tricalcium Phosphate glass in the eutectic composition. The glass samples were prepared by melting the eutectic powder mixture in a Pt-Rh crucible at 1600 °C and pouring it in a preheated brass mould. Afterwards, the glass was annealed to relieve the inner stresses. Cladding waveguides were fabricated by focusing beneath the sample surface using a pulsed Ti:sapphire laser with a pulsewidth of 120 fs working at 1 kHz. The optical properties of these waveguides have been assessed in terms of near-field intensity distribution and transmitted power, and these results have been compared to previously reported waveguides with double-line configuration. Optical properties have also been studied as function of the temperature. Heat treatments up to 700 °C were carried out to diminish colour centre losses where waveguide's modes and transmitted power were compared in order to establish the annealing temperature at which the optimal optical properties were reached. Laser experiments are in progress to evaluate the ability of the waveguides for 1064 nm laser light generation under 800 nm optical pumpingThis work has been partially supported by the projects MAT2013-48426-C2-1-R, DISFOTINT (MECC, TEC2010-21574-C02-01/02) and MICROSERES (Comunidad de Madrid, P2009/TIC-1476). Dr. Daniel Sola thanks the Bosch and Siemens Home Appliances Group, the 7th Framework Programme EU No 314630-UV Marking and MAT2013-41045-R for the financial support of his contrac

Self-frequency-doubling of ultrafast laser inscribed neodymium doped yttrium aluminum borate waveguides

Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters 98 (2011): 181103 and may be found at http://apl.aip.org

Fluorescence imaging of lattice re-distribution on step-index direct laser written Nd:YAG waveguide lasers

The laser performance and crystalline micro-structural properties of near-infrared step-index channel waveguides fabricated inside Neodymium doped YAG laser ceramics by means of three-dimensional sub-picosecond pulse laser direct writing are reported. Fluorescence micro-mapping of the waveguide cross-sections reveals that an essential crystal lattice re-distribution has been induced after short pulse irradiation. Such lattice re-distribution is evidenced at the waveguide core corresponding to the laser written refractive index increased volume. The waveguides core surroundings also present diverse changes including slight lattice disorder and bi-axial strain fields. The step-index waveguide laser performance is compared with previous laser fabricated waveguides with a stress-optic guiding mechanism in absence of laser induced lattice re-distributionThis work was supported by the Spanish Government under Project Nos. MAT2013-47395-C4-1-R, TEC2010- 21574-C02-01/02, MAT2013-47395-C4, and MAT2011- 29255-C02-02 and by the Generalitat de Catalunya under Project No. 2014SGR1358. A. Benayas thanks Fonds de recherche du Quebec-Nature et technologies (FRQNT) for the Postdoctoral Fellowship given to him through Programme de Bourses d’Excellence (Merit Scholarship Program for Foreign Students)