Chirped photonic crystal for spatially filtered optical feedback to abroad-area laser
2018
We derive and analyze an efficient model for reinjection of spatially
filtered optical feedback from an external resonator to a broad area, edge
emitting semiconductor laser diode. Spatial filtering is achieved by a
chirped photonic crystal, with variable periodicity along the optical axis
and negligible resonant backscattering. The optimal chirp is obtained from a
genetic algorithm, which yields solutions that are robust against
perturbations. Extensive numerical simulations of the composite system with
our optoelectronic solver indicate that spatially filtered reinjection
enhances lower-order transversal optical modes in the laser diode and,
consequently, improves the spatial beam quality.
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