574–647  nm wavelength tuning by second-harmonic generation from diode-pumped PPKTP waveguides

Abstract

We present a compact, all-room-temperature continuous-wave laser source in the visible spectral region between 574 and 647 nm by frequency doubling of a broadly tunable InAs/GaAs quantum-dot external-cavity diode laser in a periodically poled potassium titanyl phosphate crystal containing three waveguides with different cross-sectional areas ($4\times 4$, $3\times 5$, and $2\mathrm{\mu m}\times 6\mathrm{\mu m}$). The influence of a waveguide’s design on tunability, output power, and mode distribution of second-harmonic generated light, as well as possibilities to increase the conversion efficiency via an optimization of a waveguide’s cross-sectional area, was systematically investigated. A maximum output power of 12.04 mW with a conversion efficiency of 10.29% at 605.6 nm was demonstrated in the wider waveguide with the cross-sectional area of $4\mathrm{\mu m}\times 4\mathrm{\mu m}$.

© 2015 Optical Society of America

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