Patent ID: 7688873

Claim:
A laser chip comprising: a substrate; a Distributed Bragg Reflector (DBR) layer on the substrate; an active layer on the DBR layer, the active layer having a plurality of quantum wells configured to generate light if excited by a pump beam; a heat spreader in contact with a layer of the laser chip, the layer of the laser chip not including the active layer, the heat spreader being thermally conductive and optically transmissive; and an upper coating layer on the active layer, the upper coating layer including, at least one first layer having a first refractive index and a thickness of about one-fourth of a wavelength of the light generated by the active layer, and at least one second layer having a second refractive index and a thickness of about one-fourth of a wavelength of the light generated by the active layer, the at least one second layer being alternately stacked with the at least one first layer.