Spatial-filtered expanded-window lasers for high-power operation of single-stripe lasers

摘要

Abstract: We have investigated, via the beam propagation method, waveguide designs for wide window single-mode single-stripe lasers. The expanded window allows for higher power operation of the laser diode owing to the lower power density at the facets. Higher- order transverse mode suppression is achieved by incorporating a spatial filter in the waveguide that preferentially allows propagation of the fundamental mode. These devices can be fabricated using existing laser diode fabrication technologies such as reactive-ion-etching, native oxidation, or impurity- induced-disordering, and buried heterostructure processes. In our design and analysis of these devices we compare several expanding waveguides to determine the effects on mode selection. Additionally, the catastrophic optical damage power limit for these devices is expected to be significantly greater than for simple fundamental-mode single-stripe lasers. !12