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Hashemi, S., Bengtsson, J., Gustavsson, J., Stattin, M., Cosendey, G., Grandjean, N. och Haglund, Å. (2014) *Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination*.

** BibTeX **

@article{

Hashemi2014,

author={Hashemi, Seyed Ehsan and Bengtsson, Jörgen and Gustavsson, Johan S. and Stattin, Martin and Cosendey, Gatien and Grandjean, Nicolas and Haglund, Åsa},

title={Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination},

journal={Optics Express},

issn={1094-4087},

volume={22},

issue={1},

pages={411-426},

abstract={Lateral loss causes optical energy to leave the laser cavity in the transverse, lateral, direction, and is sometimes neglected to simplify the numerical simulations. However, in contrast to outcoupling and absorption losses, we show that the lateral loss can change drastically with only nanometer-sized changes of the cavity structure, from being virtually zero to becoming the major source of cavity loss, since the cavity becomes antiguiding. This can be explained as the opening of a channel of efficient resonant lateral leakage of optical power at a certain oblique propagation angle. A number of different realizations of current apertures and top mirror designs in GaN-based VCSEL cavities, which have been suggested for realization of microcavity lasers emitting in the blue wavelength range, are simulated. Many of these are shown to lead to unintentional antiguiding, which can more than double the threshold gain for lasing. Notably, for strong enough antiguiding the resonant lateral leakage decreases so that the threshold gain values might again be tolerable. This regime has been suggested for robust single-mode operation since earlier predictions, building on analogies with slab waveguides, hinted at a very strong suppression of higher order modes. However, our simulations indicate that for the VCSEL cavities the derived formulas grossly overestimate the modal discrimination.},

year={2014},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 191636

A1 Hashemi, Seyed Ehsan

A1 Bengtsson, Jörgen

A1 Gustavsson, Johan S.

A1 Stattin, Martin

A1 Cosendey, Gatien

A1 Grandjean, Nicolas

A1 Haglund, Åsa

T1 Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination

YR 2014

JF Optics Express

SN 1094-4087

VO 22

IS 1

SP 411

OP 426

AB Lateral loss causes optical energy to leave the laser cavity in the transverse, lateral, direction, and is sometimes neglected to simplify the numerical simulations. However, in contrast to outcoupling and absorption losses, we show that the lateral loss can change drastically with only nanometer-sized changes of the cavity structure, from being virtually zero to becoming the major source of cavity loss, since the cavity becomes antiguiding. This can be explained as the opening of a channel of efficient resonant lateral leakage of optical power at a certain oblique propagation angle. A number of different realizations of current apertures and top mirror designs in GaN-based VCSEL cavities, which have been suggested for realization of microcavity lasers emitting in the blue wavelength range, are simulated. Many of these are shown to lead to unintentional antiguiding, which can more than double the threshold gain for lasing. Notably, for strong enough antiguiding the resonant lateral leakage decreases so that the threshold gain values might again be tolerable. This regime has been suggested for robust single-mode operation since earlier predictions, building on analogies with slab waveguides, hinted at a very strong suppression of higher order modes. However, our simulations indicate that for the VCSEL cavities the derived formulas grossly overestimate the modal discrimination.

LA eng

DO 10.1364/OE.22.000411

LK http://dx.doi.org/10.1364/OE.22.000411

LK http://publications.lib.chalmers.se/records/fulltext/191636/local_191636.pdf

OL 30