Spontaneous emission spectra of optically pumped vertical-cavity surface-emitting lasers
| Autor: | K.H. Gulden, R.F.M. Hendriks, M. P. van Exter, L. Weegels, J. P. Woerdman, M. B. Willemsen, M. Moser |
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| Rok vydání: | 1998 |
| Předmět: |
Amplified spontaneous emission
Materials science Active laser medium business.industry Physics::Optics Laser Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials law.invention Semiconductor laser theory Optical pumping Nonlinear Sciences::Adaptation and Self-Organizing Systems Optics law Optoelectronics Spontaneous emission Electrical and Electronic Engineering Physical and Theoretical Chemistry business Quantum well |
| Zdroj: | Optics Communications. 149:50-54 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/s0030-4018(97)00719-0 |
| Popis: | We study the spontaneous emission spectra of optically pumped vertical-cavity surface-emitting lasers (VCSELs) operating below threshold. By spatial and angular filtering of the spontaneous emission spectra we can relate the observed asymmetrical shape of these spectra to the subthreshold guiding properties of the VCSELs. We find a substantial difference between VCSELs with a thin gain medium, consisting of quantum wells, and VCSELs with a thick gain medium, consisting of bulk GaAs; this difference is explained by analyzing the relative weights of thermal index guiding and carrier-induced index anti-guiding. |
| Databáze: | OpenAIRE |
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