Patent ID: 8908729
Filing Date: 2014-12-09
Classification: H01L,H01S

Abstract:
1. A high power semiconductor laser diode including a semiconductor body having an active region with two end sections and front and back facets terminating said end sections, a first injector over at least part of said semiconductor body for injecting electrons into said active region, a second injector located opposite said first injector over at least part of said semiconductor body for injecting holes into said active region, at least one of said injectors comprising a metallization layer and an electrical connection to said metallization layer, said electrical connection configured as a plurality of point contacts, or a ribbon contact, a distance of the electrical connection to said at least one of the end sections being at least half of an estimated effective penetration depth α eff of current spreading in said active region, and the metallization layer being sufficiently thin such that the degree of carrier injection in the active region decreases continuously throughout at least one of said end sections so as to provide reduced carrier density at at least one of said end sections compared to a section of the active region adjacent the at least one of said end sections, wherein the semiconductor laser diode is a junction-side-down mounted broad area single emitter (BASE) laser diode in which a relatively thick substrate material is sandwiched between the metallization layer of the first injector and the active layer; and wherein said effective penetration depth is based on an approximate analytic expression derived for the junction-side-down mounted BASE laser diode, the analytic expression being shown in the following equation: where: σ σ