Beam quality of high-power broad-area visible diode lasers

摘要

We characterize the beam quality of visible-wavelength GRIN-SCH-SQW lasers in terms of geometry and driving current. A second-moment-based, free beam measurement ofM2yields values ranging from near unity on the plane parallel to the junction, to near 10 in the perpendicular plane. TheM2values exhibit a dependence on the shape of theL-Icharacteristic. Higher-order moments are uso quantitatively describe the changes in beam shape as a function of current, and a correlation between the kurtosis andM2is observed.