Using InGaAsP lattice matched to GaAs, InGaAs/GaAs/InGaAsP/InGaP 0.98-mu-m GRINSCH SL-SQW lasers were fabricated for the first time. A high characteristic temperature of 215 K was measured at 10-70-degrees-C. A CW light output power of over 300 mW was achieved on 3-mu-m-wide ridge waveguide lasers with current-blocked regions near cavity facets.