Far field dynamics of strongly coupled narrow stripe ridge-waveguide laser arrays (1060 nm)

The temporal behavior of an optical power at different moments of pulse in the far field is studied for a laser array $(\lambda=1060\ \text{nm})$ based on InGaAs/AlGaAs/GaAs. An array of narrow-stripe laser diodes with a straight ridge of $6.5-\mu\mathrm{m}$ width and a $13.5\ \mu\mathrm{m}$ -wide pitch without distributed feedback elements demonstrates that despite the strong optical coupling between adjacent array elements the lateral far fields only slightly differ from each other in width at half maximum (FWHM) (by $\pm 0.5^{\circ}$ ) at different moments of the pulse (130 ns/1 kHz) at a pump current amplitude of 5 A.