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

被引:31
作者
Hashemi, Ehsan [1 ]
Bengtsson, Jorgen [1 ]
Gustavsson, Johan [1 ]
Stattin, Martin [1 ]
Cosendey, Gatien [2 ]
Grandjean, Nicolas [2 ]
Haglund, Asa [1 ]
机构
[1] Chalmers, Dept Microtechnol & Nanosci, Photon Lab, SE-41296 Gothenburg, Sweden
[2] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, Lab Adv Semicond Photon & Elect, CH-1015 Lausanne, Switzerland
来源
OPTICS EXPRESS | 2014年 / 22卷 / 01期
基金
瑞典研究理事会;
关键词
SURFACE-EMITTING LASERS; MODEL;
D O I
10.1364/OE.22.000411
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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 themodal discrimination. (C) 2014 Optical Society of America
引用
收藏
页码:411 / 426
页数:16
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