Second harmonic generation in precisely diced KTiOAsO4 ridge waveguides

We demonstrate KTiOAsO4 (KTA) ridge optical waveguides by precise diamond blade dicing of ion-irradiated planar waveguides. The guiding and spectroscopic properties of ridge waveguides have been investigated. The original properties of the z-cut KTA crystal have been well preserved in the ion-irradiation area. Under optical excitation of a 1064-nm pulsed laser, second harmonic generation (SHG) of green laser at 532 nm is generated from waveguide structures, demonstrating a maximum output power of 1.71 mW and a SHG conversion efficiency of 4.28%. The results in this work suggest promising applications of diamond blade diced KTA waveguides in integrated photonics and nonlinear optics.

Automated summary

In this study, KTA ridge optical waveguides were fabricated by precise diamond blade dicing of ion-irradiated planar waveguides, preserving the original properties of the crystal. Second harmonic generation of green laser was achieved with a maximum output power of 1.71 mW and a conversion efficiency of 4.28%, suggesting potential applications in integrated photonics and nonlinear optics.