In-junction-plane beam divergence stabilization by lateral periodic structure in wide-stripe laser diodes

Andrzej Maląg; Grzegorz Sobczak; Elżbieta Dąbrowska; Marian Teodorczyk; Andrzej Maląg; Grzegorz Sobczak; Elżbieta Dąbrowska; Marian Teodorczyk

doi:10.3934/ElectrEng.2019.4.370

AIMS Electronics and Electrical Engineering

2019, Volume 3, Issue 4: 370-381. doi: 10.3934/ElectrEng.2019.4.370

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Research article Topical Sections

In-junction-plane beam divergence stabilization by lateral periodic structure in wide-stripe laser diodes

1.
Łukasiewicz Research Network - Institute of Electronic Materials Technology, 133 Wólczyńska str., 01-919 Warszawa, Poland
2.
Łukasiewicz Research Network - Institute of Electron Technology, 32/46 Lotników av., 02-668 Warszawa, Poland

Received: 12 August 2019 Accepted: 06 November 2019 Published: 15 November 2019

This paper describes the way to stabilize in-junction-plane optical field distribution and emitted beam divergence in high-power 970-nm-band laser diodes (LDs). This is done by introducing a lateral periodic structure into the LD‟s wide-stripe-waveguide, designed to prefer and stabilize the selected (resonant) high-order lateral mode. According to modeling, in CW operation the gain equalization of lateral modes due to thermal index guiding leads to beam divergence stabilization by incorporating the modes up to the resonant one and cutting out higher ones. This was demonstrated experimentally in a wide drive current range. Such stability of a non-Gaussian laser beam profile with steep slopes can be interesting for many applications. Thanks to the drive current flow control by the periodic structure, the effects typical for conventional wide-stripe LDs, such as lateral current crowding, carrier accumulation at stripe edges and optical far-field blooming are not observed.

Keywords:

Citation: Andrzej Maląg, Grzegorz Sobczak, Elżbieta Dąbrowska, Marian Teodorczyk. In-junction-plane beam divergence stabilization by lateral periodic structure in wide-stripe laser diodes[J]. AIMS Electronics and Electrical Engineering, 2019, 3(4): 370-381. doi: 10.3934/ElectrEng.2019.4.370

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Abstract

Dear Editorial Board Members,

It is my pleasure to share with you the year-end report for AIMS Environmental Science. The journal continues to improve its quality as indicated by steady increases in the number of manuscripts received and the number of articles published over the past three years (Figure 1). We have received 69 submissions with 28 published online. The most downloaded and cited papers are listed in Tables 1 and 2. The top read article received more than 11390 downloads.

Figure 1. Manuscript statistics.

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Table 1. The top 10 articles with most pdf download: (By December 31th 2019).

Title	Usages
Quantifying the local-scale ecosystem services provided by urban treed streetscapes in Bolzano, Italy	11390
Feasibility study of a solar photovoltaic water pumping system for rural Ethiopia	2021
Biophilic architecture: a review of the rationale and outcomes	2016
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Table 2. The top 10 articles with most cited: (By December 31th 2019).

Title	Number
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I would like to thank all the board members for serving on the Editorial Board and their dedication and contribution to the journal, especially to the editors for two special issues: Impacts of Microplastics in the Urban Environment Conference and Green built environment. The goal in 2020 is to solicit more manuscripts and increase paper citations. We will try our best to reduce the processing time and supply with a better experience for publication. To recognize the contribution of the Editorial Board members and authors during the years, we will continue to offer that (1) for authors invited, the article processing charge (APC) is automatically waived; (2) each editorial board member is entitled for some waivers. I am looking forward to continuing working with you to make the AIMS Environmental Science a sustainable and impactful journal. Please don’t hesitate to send me e-mails if you have new ideas and suggestions to help us to achieve this goal.

Yifeng Wang, Ph.D.

Editor in Chief, AIMS Environmental Science

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