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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.<<ETX>>