Nonlinear Dynamics in Semiconductor Lasers 2023 - Abstract
Malica, Tushar
A time-delay-differential equation theoretical model will be presented as a paradigm for multi-sectional and free-space elements with flexible cavity configuration used to analyze the dynamics of mutually-coupled Vertical-cavity surface-emitting lasers (VCSELs). Herein, two single-longitudinal mode VCSELs placed facing each other and optimized for fundamental mode-locking (FML) over a wide range of parameters are simulated. The biased VCSEL chip is made to act as the gain, while the second VCSEL chip is unbiased and hence functions as an absorber. This setup is shown as a promising alternative to the popularly used conventional SESAM mode-locked VECSEL to produce mode-locked pulses. The rate-equation model calculates the carrier density and electric fields using the 4th-order Runge-Kutta method. Parameter space for the work is defined by laser facet reflectivities and bias current and used to show general trends in the exhibited nonlinear dynamics and pulsed solutions. The presented model is argued to be a more global and inclusive model than the current alternatives, which accurately, but in isolation, either solve for nonlinear dynamics for FML regime.