Mode-locked coupled-stripe quantum well laser operation (λ∼7350 Å) in a tunable (Δℏω∼37 meV>k T) external grating cavity

Abstract
The performance of an actively mode‐locked coupledstripe AlxGa1−xAs‐AlxGa1−xAs quantum well laser in a tunable external cavity is described. Pulses as short as 50 ps are measured and a tuning range of Δℏω∼37 meV>kT, which is not the limit, is demonstrated. The existence of the transverse modes of coupled‐stripe lasers increases significantly the spectral density of available lasing modes (for mode locking) compared with a single‐stripe laser.