The P-waveguide and P-cladding layers′ thickness which affects the output power is optimized for quantum well diode lasers.The optical mode is shifted from symmetric distribution to asymmetric distribution.which further reduces the optical confinement factor in the quantum well and the power density on the facet.So the catastrophic optical damage(COD)doesn′t appear.On the other hand,the power conversion efficiency(PCE) is improved and the thermal resistance is reduced,which can effectively restr...