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Direct Writing of Type-II Waveguides in Lithium Niobate using Ultrafast Fibre Laser

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Abstract

We report direct writing of depressed cladding waveguides in X-cut Y propagating LiNbO3 using 270 fs, 1030 nm Ytterbium doped fiber laser. Transverse writing technique is used to inscribe multiple parallel lines forming cylindrical waveguide geometry of varying diameters. The waveguide upper edge was written 250 μm below the sample surface. We report on characterization of such waveguides for propagation loss and mode confinement dependence at 1550 nm on waveguide diameter and number of lines used in creating type-II waveguide region.

© 2014 Optical Society of America

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