R. Muller et A. Klehr, POLARIZATION DYNAMICS OF STRAINED 1.3 MU-M INGAASP-INP LASERS - SPECTRAL PROPERTIES AND LATERAL NEAR-FIELD BEHAVIOR, Quantum and semiclassical optics, 10(1), 1998, pp. 37-50
Emission from a tensile-strained ridge-waveguide InGaAsP-InP laser, wh
ich exhibits a transition between TE and TM polarization when the DC i
njection current exceeds a certain value, was investigated by lime-and
polarization-resolved measurements. Under excitation with 100 ps curr
ent pulses the laser emits pairs of TE and TM pulses of about 50 ps du
ration. The longitudinal modes of the emission spectrum exhibit differ
ent spectral profiles depending on the mode wavelength, which can be e
xplained in terms of the mode competition and asymmetric gain dispersi
on. The near-field intensity distribution of the laser excited with a
1.4 ns current pulse shows periodic changes of its lateral width assoc
iated with 3 GHz relaxation oscillations alternating between TE and TM
polarization.