Ultra-high power RWG laser diodes with lateral absorber region

Experimental and theoretical analysis of the dominant lateral waveguiding mechanism in 975 nm high power broad area diode lasers

“…If lossy regions were introduced into the edges of the device, this would potentially allow higher order modes to be preferentially suppressed. Similar techniques have long been used successfully in ridge waveguide lasers, for example by use of carefully tailored trench profiles [36] through the introduction of absorber elements along the ridges [37], or by the use of corrugations in the sides of the ridge [38], amongst other techniques. However, the higher order lateral modes present in ridge waveguide lasers show much larger differences in near field than those seen here for broad area lasers, enabling more efficient modal discrimination.…”