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In situ assessment and minimization of nonlinear propagation effects for femtosecond-laser waveguide writing in dielectrics

AuthorsFerrer, Andrés; Ruiz de la Cruz, A.; Puerto, D. ; Gawelda, W.; Vallés, J. A.; Rebolledo, M. A.; Berdejo, V.; Siegel, Jan ; Solís Céspedes, Javier
Issue Date2010
PublisherOptical Society of America
CitationJournal of the Optical Society of America B: Optical Physics 27: 1688-1692 (2010)
AbstractThe effect of nonlinear propagation on the shape of the focal volume has been assessed by in situ plasma emission imaging during the subsurface processing of a commercial phosphate glass. The sample was processed with an elliptically shaped femtosecond-laser beam at 1 kHz repetition rate and scanned transversely with respect to the writing beam axis. As a consequence, optimal conditions for minimizing undesirable nonlinear propagation effects during the production of optical waveguides by direct laser writing have been determined. Under these conditions, it is possible to induce structural transformations and still preserve the focal volume shape associated with the linear propagation regime. While at low pulse energy a single scan laser-written structure does not support a guided mode, the use of multiple scans with minimized nonlinear propagation effects enables the production of optical waveguides. The latter show a significantly improved performance in terms of the refractive index change and propagation losses when compared to single scan waveguides. © 2010 Optical Society of America.
Identifiersdoi: 10.1364/JOSAB.27.001688
issn: 0740-3224
Appears in Collections:(CFMAC-IO) Artículos
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