Reflectivity minimization of semiconductor laser amplifiers with coated and angled facets considering two-dimensional beam profiles

The reflectivity minimization of semiconductor laser amplifiers and waveguides with straight and angle facets is considered. A formalism, taking two-dimensional waveguides effects into account, that allows the design of multilayer coatings on output facets with minimized reflectivities for either the transverse-electric (TE), transverse-magnetic (TM), or both polarizations is developed. A detailed study of residual modal reflectivities for two-dimensional rectangular laser profiles is presented. Reflectivities as low as 10/sup -4/-10/sup -5/ are achieved using angled output facets. The reflectivity of higher order modes and mode conversion are shown to limit the residual reflectivities of tilted laser outputs.<
>