Microscopic nonequilibrium dynamics of gain coupled mode-locked dual cavity VECSELs

Mode-locked shared gain coupled VECSEL cavities exhibit novel lasing properties with dual cavities supporting independently running mode-locked fs pulse trains. Using an extended Maxwell – Semiconductor Bloch microscopic model, we show that initial simulations support experimentally observed independent mode-locking at separated wavelengths with little evidence for gain competition. Our extended SBE model expands the microscopic carrier populations and polarizations in a nonparaxial grating basis to capture large angle incident beams on the gain chip. Preliminary simulations support uncoupled mode-locking showing pulses simultaneously incident on the gain chip and we identify a novel independent mechanism for the wavelength selectivity.