Hydrogenated amorphous silicon (a\|Si∶H) with an optical bandgap of 1.74eV, deposited by electron beam reactive evaporation in H\-2 atmosphere has been used in combination with Al\-2O\-3 film as the facet reflector for high power 808nm quantum well laser. In comparison with usual film stack of a\|Si and Al\-2O\-3 shown strong optical absorption at wavelength of 808nm, the optical absorption coefficient of the new film system has been significantly lowered from 2×10\+3/cm to a negligible level. The optoelect...