Evolution from modal to spatially incoherent emission of a broad-area VCSEL

Shyam K. Mandre, Wolfgang Elsäßer, Ingo Fischer, Michael Peeters, Guy Verschaffelt

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24 Citations (Scopus)


Broad-area vertical-cavity surface-emitting lasers (BA-VCSELs) can exhibit a state of spatially incoherent emission, as we recently reported in [M. Peeters et al., Opt. Express, 13, 9337 (2005)]. Here, we experimentally study the evolution of a BA-VCSEL under pulsed operation from well-defined modal emission with a multitude of transverse cavity modes to such spatially incoherent emission. The transition is studied using a high-speed intensified CCD camera and differential image analysis with which single-shot measurements of the imaged nearfield, farfield, spatial coherence, and spectral emission properties are acquired. This combination of experimental characterization tools allows for a detailed description of the BA-VCSEL's emission behavior, which is necessary for an in-depth understanding of the processes involved. We find the interplay between the thermal chirp and the build-up of a spatially distributed thermal lens to be decisive for the break-up of the global cavity modes. © 2008 Optical Society of America.

Original languageEnglish
Pages (from-to)4452-4464
Number of pages13
JournalOptics Express
Issue number7
Publication statusPublished - 31 Mar 2008


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