Fabrication of ridge waveguides in potassium titanyl phosphate (KTP) for nonlinear frequency conversion

Martin F. Volk; Christian E. Rüter; Detlef Kip

doi:10.1117/12.2290008

15 February 2018 Fabrication of ridge waveguides in potassium titanyl phosphate (KTP) for nonlinear frequency conversion

Martin F. Volk, Christian E. Rüter, Detlef Kip

Author Affiliations +

Proceedings Volume 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII; 105161A (2018) https://doi.org/10.1117/12.2290008
Event: SPIE LASE, 2018, San Francisco, California, United States

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.

Citation Download Citation

Martin F. Volk, Christian E. Rüter, and Detlef Kip "Fabrication of ridge waveguides in potassium titanyl phosphate (KTP) for nonlinear frequency conversion", Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105161A (15 February 2018); https://doi.org/10.1117/12.2290008

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