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Spatial Modulation of Linear and Quadratic Susceptibilities in Lithium Niobate Crystals by Using Femtosecond Laser Pulses

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In this work we present the spatial control of the linear susceptibility ( 1 ) in Lithium Niobate crystals by means of infrared (800 nm) femtosecond interaction. Diffraction gratings have been performed on the surface (relief) and inside (phase) of these samples by femtosecond laser writing. Also we have performed a spatial control of the quadratic susceptibility ( 2 ) by direct writing of a pattern of ferroelectric domains on the surface of z cut substrates by using the second harmonic femtosecond pulses (400 nm). Finally, efficient photonic devices for second harmonic generation via quasi phase matching could be obtained following the experimental procedure presented in this work.
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Keywords: Lithium niobate; diffraction gratings; femtosecond laser writing; ferroelectric domains; quasi phase matching

Document Type: Research Article

Affiliations: 1: Centro de Investigaciones Ópticas (CIC-Conicet), C.C. 124, La Plata, 1900, Argentina 2: Optics Group—Applied Physics Department, Universidad de Salamanca, Plaza de la Merced s/n 37008, Salamanca, Spain

Publication date: 01 January 2006

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