학술논문
A study of distributed dielectric bragg reflectors for vertically emitting lasers of the near-IR range.
Document Type
Article
Author
Source
Subject
*DIELECTRIC materials
*BRAGG gratings
*NEAR infrared radiation
*MAGNETRON sputtering
*SURFACE emitting lasers
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Language
ISSN
1063-7850
Abstract
Studies aimed at optimization of the design of a dielectric distributed Bragg reflector (DBR) produced by the reactive magnetron sputtering method for applications in near-IR vertical-cavity surface-emitting lasers with intracavity contacts (ICC-VCSELs) are carried out. It is shown that the reflectivity of the dielectric DBRs based on SiO/TiO decreases due to the polycrystalline structure of the TiO layers, which causes diffusive scattering of light. In contrast, amorphous TaO layers is characterized by a low surface roughness and low fluctuation in the refractive index. Single-mode ICC-VCSELs in the 980-nm spectral range with dielectric DBR based on SiO/TaO with a threshold current less than 0.27 mA, electric resistance of less than 200 Ω, and differential efficiency of more than 0.8 W/A are demonstrated. [ABSTRACT FROM AUTHOR]