Large-Scale Proton-Implant-Defined VCSEL Arrays with Narrow Beamwidth
Journal article, 2018

In-phase coherently coupled proton-implant-defined vertical cavity surface emitting laser (VCSEL) arrays face difficulties in current spreading, resulting in small array scale, low output power, and broad beamwidth. Although patterned metal grids can improve the current spreading, the undesirable out-of-phase mode tends to be dominant in the array. In this letter, by means of engineering the implantation and array parameters, in-phase mode is obtained in large-scale proton-implant-defined arrays with metal grids. Experimental results show that these arrays are operating in in-phase mode with a nominal interelement spacing of 8 μm and an implantation depth of 2.22 μm. By using these parameters, a 5 × 5 in-phase array with a narrow beamwidth (far-field full width at half maximum) of 1.61° is realized. Besides, a 10 × 10 in-phase array with a beamwidth of 1.89° and an output power of 10.25 mW for the in-phase mode is achieved. The calculation of far fields is performed to confirm the in-phase operation measured results. Such a simple and low-cost technology provides a promising method for preparing large-scale in-phase coherently coupled VCSEL arrays.

VCSEL array

in-phase

narrow beamwidth

proton implantation

Author

G. Z. Pan

Beijing University of Technology

Y. Xie

Beijing University of Technology

Chen Xu

Beijing University of Technology

M. Xun

Beijing University of Technology

Y. B. Dong

Beijing University of Technology

Jun Deng

Beijing University of Technology

Jie Sun

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Beijing University of Technology

IEEE Electron Device Letters

0741-3106 (ISSN)

Vol. 39 3 390-393

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/LED.2018.2796183

More information

Latest update

5/8/2018 9