Protective Coating For GaAs Laser
Original Publication Date: 1979-Mar-01
Included in the Prior Art Database: 2005-Feb-20
Facet damage at the surface of a GaAs laser can be prevented by coating the cleaved faces with a thin film of amorphous Si(1) C(x) made by the glow discharge deposition process. The refractive index of the coating can be made to closely approximate that of the laser by choosing x to be in the range of 0.3. Consequently, the coating can be of arbitrary thickness without affecting the efficiency or power output of the laser. This permits the coating to be nonuniform, which in turn, allows the laser to be mounted in its header during the coating operation. It also enables a thick coating to be used, which makes it a more effective heat sink.