Watt-level second-harmonic generation at 589  nm with a PPMgO:LN ridge waveguide crystal pumped by a DBR tapered...

A DBR tapered diode laser in continuous wave operation was used to generate second-harmonic radiation at 589 nm in a PPMgO:LN ridge waveguide crystal. An optical output power of 0.86 W at an optical-to-optical and an electrical-to-optical efficiency of 42% and 11%, respectively, was achieved. The visible radiation was characterized by a spectral bandwidth Δν_FWHM of 230 MHz and a beam propagation parameter M1/e²2 better than 1.1. The integration of such a system into a housing of a small footprint will enable a portable and highly efficient module featuring a visible output power in the watt-level range.