Spectral and picosecond temporal properties of flared guide Y‐coupled phase‐locked laser arrays

Spatio‐spectral and spatio‐temporal properties of flared waveguide ‘‘Y’’‐coupled laser arrays are investigated in both cw and pulsed operation. In each case, regular sustained self‐pulsations are exhibited. Destabilization of phase locking, caused by amplitude phase coupling, is thought to be the origin of the pulsations.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70525/2/APPLAB-53-24-2380-1.pd

Temporal behavior of resonant‐optical‐waveguide phase‐locked diode laser arrays

Measurements of the temporal and spatial behavior of resonant optical waveguide (ROW) laser arrays with significant interelement loss reveal the presence of sustained self‐pulsations in the output intensity of the laser. The mechanism responsible for pulsations is believed to be saturable absorption arising from the presence of absorbers in the interelement regions. This is experimentally confirmed in that reduction or elimination of the interelement loss suppresses the pulsations. Quiescent behavior is obtained to at least 0.45 W continuous wave power and 3.4 times threshold in near‐diffraction‐limited beams from devices with negligible interelement loss.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70212/2/APPLAB-64-7-827-1.pd

Modulation of twin-emitter semiconductor lasers beyond the frequency of relaxation oscillations

Self-modulation above the relaxation oscillation frequency has been previously observed in a phased-array semiconductor lasers. Rate equations for a twin-emitter phased-array semiconductor laser are used to show that active optical modulation above the relaxation oscillation frequency can be achieved by introducing a 180[deg] relative phase shift in the emitter current modulation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/29377/1/0000447.pd