By reducing the Al concentration in waveguide layer and optical confinement layer,stabilizing the epi-growth condition and combining with standard broad-area-laser processing technology,we obtain a continuous output power of 823 mW when working at 15 ℃,the peak wavelengh is 1.96 μm with 0.5 A injection current.In pulsed condition of 1000 Hz and 5% duty cycle, the maximum output power of about 1.86 W is gotten.