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We report on the high-temperature performance of high-power GalnNAs broad area laser diodes with different waveguide designs emitting in the 1220-1240-nm wavelength range. Large optical cavity laser structures enable a maximum continuous-wave output power of >8.9 W at T = 20degC with emission at 1220 nm and are characterized by low internal losses of 0.5 cm-1 compared to 2.9 cm-1 for the conventional waveguide structures. High-power operation up to temperatures of 120deg C is observed with output powers of >4 W at T = 90degC. This laser diode showed characteristic temperatures of To = 112 K and T1 = 378 K.