MICHLER, P., VEHSE, M., GUTOWSKI, J., BEHRINGER, M., HOMMEL, D., PEREIRA, Mauro and HENNEBERGER, K. (1998). Optical gain characteristics and excitonic nonlinearities in II–VI laser diodes. Journal of Crystal Growth, 184-18, 575-579.Full text not available from this repository.
Gain characteristics and lasing of (Zn, Cd)Se/Zn(S, Se)/(Zn, Mg)(S, Se) separate confinement heterostructures are investigated by optical-gain spectroscopy and by high-excitation spectroscopy under quasi-stationary conditions. The optical gain is measured by means of the stripe-length method whereas excitonic bleaching under lasing conditions is analyzed through two-beam photoluminescence excitation (PLE) spectroscopy. At low lattice temperature, we find a rather low threshold density of 15–20 kW/cm2 for both laser structures and the excitonic enhancement is still preserved at the onset of lasing. The red shift of the gain maximum with respect to the low-density PLE exciton peak increases with temperature. The results indicate a considerable influence of Coulomb correlations even at the high densities necessary for stimulated emission and are more adequately explained by a strongly correlated electron-hole plasma model that goes beyond the simple “excitonic lasing” concept.
|Research Institute, Centre or Group:||Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group|
|Depositing User:||Helen Garner|
|Date Deposited:||18 Nov 2014 16:06|
|Last Modified:||18 Nov 2014 16:06|
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