A Global Optimization Approach to Laser Design

The objective of this work is to develop and validate the basis of a novel laser modeling and design methodology that incorporates a global optimization approach. Classical modeling techniques typically involve design evaluations that are conducted at the laser's threshold injection current. This is the point where the laser is just turning on, and the (standard practice) numerical challenge is minimal. The fundamental difference offered by the proposed new methodology is the possibility of developing laser designs directly at the injection current (power level) of interest.The effectiveness of the new methodology is verified by considering the computationally difficult problem of maximizing a laser's internal (cavity) field flatness over a range of above-threshold injection currents, while also considering the boundary condition error of the laser's internal field solution. Global optimization is then used to find an optimally flat field solution in terms of the laser's structural design parameters. The favorable comparison between our results and the results obtained by the extrapolation of threshold designs to the same injection current indicate the self-consistency and fundamental capabilities of the new methodology.