Transverse modes in oxide confined VCSELs: Influence of pump profile, spatial hole burning, and thermal effects | Zendy

Christian L. Degen | Zendy; W. Elsäβer | Zendy; Ingo Fischer | Zendy

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Transverse modes in oxide confined VCSELs: Influence of pump profile, spatial hole burning, and thermal effects

Author(s) -

Christian L. Degen,

W. Elsäβer,

Ingo Fischer

Publication year - 1999

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.5.000038

Subject(s) - lasing threshold , optics , materials science , transverse plane , laser , thermal , amplified spontaneous emission , aperture (computer memory) , transverse mode , spontaneous emission , optoelectronics , physics , structural engineering , meteorology , acoustics , engineering

We present experimental studies on the transverse mode emission behaviour of oxide-confined Vertical Cavity Surface Emitting Lasers (VCSELs). VCSELs with aperture diameters of 6um and 11um exhibit a wide variety of emission patterns from low order Hermite- Gaussian modes to high order Laguerre-Gaussian modes. We obtain detailed information about the spatial gain distribution by recording spontaneous emission intensity profiles during lasing operation. We conclude from these profiles, that the spatial carrier distribution is primarily governed by the in uence of pump induced current spreading and is only secondarily in uenced by further effects such as spatial hole burning, and thermal gradients in the laser. The combination of these mechanisms causes a strong tendency towards the emission of high order transverse modes.

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