The advantages of asymmetric large optical cavity(LOC) structure to raise the output ooptical power of GaAlAs/GaAs laser are analysed.The parameters of A-LOC
which are used to get the maximum output optical power and fundamental transverse mode
are calculated
We fabricated the A-LOC GaAlAs/GaAs laser based on the above analysis.The output optical power(cw) without coating is above 85mW.This resultis agrees with the theoretical calculation.