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Experimental determination of the temperature distribution in trench-confined oxide vertical-cavity surface-emitting lasers

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4 Author(s)
Dabbicco, M. ; Dipt. Interuniversitario di Fisica, Univ. e Politecnico di Bari, Italy ; Spagnolo, Vincenzo ; Ferrara, M. ; Scamarcio, Gaetano

We measured the temperature profile of operating vertical-cavity surface-emitting lasers by means of a contactless optical micro-probe technique, based on the analysis of spectral features in the spontaneous electroluminescence escaping the top Bragg mirror. Increasing the injected current above threshold in the range of 4-10 mA leads to a progressively nonuniform and bell-shaped distribution of temperatures with the laser center ∼40% warmer than the edges. These results validate previous numerical calculations and show the usefulness of the proposed technique compared with the laser wavelength shift method.

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Quantum Electronics, IEEE Journal of  (Volume:39 ,  Issue: 6 )