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Proceedings Paper

Fabrication of ridge waveguides in potassium titanyl phosphate (KTP) for nonlinear frequency conversion
Author(s): Martin F. Volk; Christian E. Rüter; Detlef Kip
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Paper Abstract

We discuss results on a novel fabrication scheme for optical ridge waveguides in KTP by combination of ridge definition using a diamond blade dicing saw and Rb/Ba ion exchange. In contrast to conventional waveguides in KTP, our samples were prepared in substrates that have their z-axis lying in the surface plane, perpendicular to the waveguide. The ridge waveguides were ion-exchanged through their cut flanks followed by further annealing treatment in air. This results in a homogeneous refractive index increase across the rectangular waveguide cross section. Since Rb ions are only mobile along the z-axis, they cannot diffuse into the depth. Therefore, the fabricated waveguides can withstand elevated temperatures. We determined propagation losses to be only 0.3dB/cm (0.4dB/cm) for TE (TM) polarization at ∼1060nm. These novel waveguides can allow for improved mode overlap in frequency conversion processes and better coupling of light from a fiber to the waveguide.

Paper Details

Date Published: 15 February 2018
PDF: 7 pages
Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105161A (15 February 2018); doi: 10.1117/12.2290008
Show Author Affiliations
Martin F. Volk, Helmut-Schmidt Univ. (Germany)
Christian E. Rüter, Helmut-Schmidt Univ. (Germany)
Detlef Kip, Helmut-Schmidt Univ. (Germany)

Published in SPIE Proceedings Vol. 10516:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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