Metal‐grating‐outcoupled, surface‐emitting distributed‐feedback diode lasers

Masoud Kasraian, Dan Botez
1996 Applied Physics Letters  
The theoretical analysis of antiphase, surface-emitting, complex-coupled, distributed feedback ͑SE-CC-DFB͒ lasers is presented. The specific configuration chosen for analysis is relatively simple: a metallic second order grating placed atop a diode-laser structure. This type of SE-CC-DFB structure can be fabricated by a lift-off and evaporation process; can operate in a single-lobed, orthonormal beam with a rather uniform near-field intensity pattern, and external differential quantum
more » ... l quantum efficiency, d , values in excess of 30%. The dependence of the gain threshold on grating duty cycle for both the symmetric and antisymmetric ͑longitudinal͒ modes is presented and discussed. The external differential quantum efficiency for the symmetric mode is found to steadily increase with grating length at the expense of the degree of near-field-pattern uniformity. © 1996 American Institute of Physics. ͓S0003-6951͑96͒00345-2͔ Complex-coupled, distributed-feedback ͑CC-DFB͒ edge-
doi:10.1063/1.116846 fatcat:cwfql23aezgi7ef3y3chg5hhca