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Stress-induced buried waveguides in the 0.8CaSiO3-0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions

AutorSola, D.; Martínez de Mendívil, J.; Vázquez de Aldana, J. R.; Lifante, G.; Balda, Rolindes ; Aza Moya, Antonio H. de; Pena, Pilar; Fernández, Joaquín
Fecha de publicación2012
CitaciónE-MRS 2012 Spring - Symposium V (2012)
ResumenIn this work the formation of buried optical waveguides by femtosecond laser inscription in the 0.8CaSiO3-0.2Ca3(PO4)2 eutectic glass doped with Nd3+ ions is reported. The glass samples were prepared by melting the eutectic powder mixture in a Pt-Rh crucible at 1600 ºC and pouring it in a preheated brass mould. Afterwards, the glass was annealed to relieve the inner stresses. The buried waveguides were fabricated by focusing under the surface a pulsed Ti:sapphire laser with a pulsewidth of 120 fs working at 1 kHz. Two adjacent filaments were written to define a region where an increase in the refractive index occurs. The effects produced by the variation of the laser pulse energy as well as the distance between tracks, scanning speed and focusing distance were studied. After the laser processing the near-field intensity distribution of the waveguide's modes at 635 nm was studied. In order to diminish the losses by colour centres absorption a heat treatment was carry out in the samples. The waveguide's modes were compared with those of the samples without heat treatment. The spectroscopic properties of the neodymium ions have been characterized to evaluate if their optical properties have been modified by the waveguide fabrication. Laser experiments are in progress to evaluate the ability of the waveguides for 1064 nm laser light generation under 800 nm optical pumping.
DescripciónTrabajo presentado al: "E-MRS 2012 Spring - Symposium V: Laser materials processing for micro and nano applications" celebrado en Strasbourg (Francia) en Abril de 2012.
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