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Single Mode Channel Waveguides and Y Junctions at 3.39 mm using Ti Diffusion in Lithium Niobate
Olga Caballero-Calero, Axelle Nolot, Guillermo Martin1 and Nadège Courjal

We present recent developments on single mode mid-infrared Ti diffusion waveguides achieved in Lithium Niobate. The set of samples studied consist on planar, channel waveguides and Y junctions. We show the FTS spectra of the channels, allowing to study the modal cut-off, the propagation losses on the waveguides and the observation of the interference fringes obtained from the Y junctions. These results are encouraging for the development of integrated interferometers and spectrometers in the mid-infrared using materials that present electro-optic behaviour, and can therefore be useful in active beam combiners, Mach-Zehnder interferometers and couplers.

Keywords: Single mode mid-infrared waveguides, integrated interferometers, beam combiners, lithium niobate, modal filtering, Titanium diffusion

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