Comparison of Long-Time Delay in Lasing in Homo- and Heteroepitaxially Grown II-VI Laser Diodes |
| A. Isemann, M. Behringer, H. Wenisch, M. Fehrer, K. Ohkawa and D. Hommel Institute of Solid State Physics, University of Bremen, P.O. Box 330 440, 28334 Bremen, Germany |
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| Gain guided laser diodes exhibit unexpected low threshold current densities. Under these conditions, lasing only occurs under a current dependent long-time delay, which is three orders of magnitude larger than the time needed to reach population inversion. This effect is attributed to a thermally induced index guiding. The change in temperature of the quantum well region can be estimated using the shift in the wavelength of emission to be up to 70 K. As a further consequence, the threshold current density can be reduced by a factor of 4 simply by changing the pulse width of the applied current. |
| DOI: 10.12693/APhysPolA.94.355 PACS numbers: 42.55.Px |