Dynamics of longitudinal and transverse modes along the junction plane in GaAlAs stripe lasers

Abstract

[6] T. L. Paoli and P. A. Barnes, "Saturation of the junction voltage in stripe-geometry (A1Ga)As double-heterostructure junction lasers," Appl. Phys. Lett.,vol. 28, pp. 714-716, June 1976. [7] Further support for this conclusion has also been obtained with unaged window lasers of a design similar to that used in [ 8 ] . In those devices which also exhibited intensity pulsations, no regions of reduced spontaneous emission were found. S . -I. Gonda and S . Mukai, "Degradation and intensity fluctuations in CW AlGaAs double-heterostructure junction lasers," IEEE J. Quantum Electron., vol. QE-11, pp. 545-550, July 1975. Correspondence Dynamics of Longitudinal and Transverse Modes Along the Junction Plane in GaAlAs Stripe LasersF. MENGEL AND V. OSTOICH Abstract-Observations of the transient excitation of higher order transverse modes dong the junction plane in DH GaAlAs stripe lasers during subnanosecond pulse modulation is reported. These modes are strongly excited at the onset of the light pulse, they decay during 200 ps, and reappear after 400-600 ps. The width of the longitudinal mode spectrum decays from 40 to 10 A during 0.5-1 ns.

Direct Modulation of Semiconductor Lasers

“…Hence, biasing the laser close to threshold also has the effect of eliminating the relatively slowly decaying tail of photons that are spontaneously emitted while the laser current is below the threshold level. Transient multimode excitation produces a broadening of the output spectrum of a pulsed laser at the onset of the current pulse [37]. The effect is particularly important at high bit rates because such transient excitation of multiple modes can affect coupling into an optical fiber, producing pulse shape distortion.…”