574-647 nm wavelength tuning by second-harmonic generation from diode-pumped PPKTP waveguides.
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 (4×4, 3×5, and 2  μm×6  μm). 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  μm×4  μm.
K A
KA
Fedorova
G S
GS
Sokolovskii
P R
PR
Battle
D A
DA
Livshits
E U
EU
Rafailov
D001152:Arsenicals; D005708:Gallium; D007204:Indium; D054023:Lasers, Semiconductor; D010710:Phosphates; D045663:Quantum Dots; D014025:Titanium
D001152:Arsenicals; D010710:Phosphates; D007204:Indium; C064806:potassium titanylphosphate; C043055:gallium arsenide; D005708:Gallium; D014025:Titanium; C076773:indium arsenide