Single-mode operation of electrically pumped edge-emitting lasers through cavity coupling of high order modes

Date
2022-03-04
Advisor
Instructor
Source Title
International Society for Optical Engineering. Proceedings
Print ISSN
0277-786X
Electronic ISSN
Publisher
SPIE
Volume
11983
Issue
Pages
1 - 8
Language
English
Type
Conference Paper
Journal Title
Journal ISSN
Volume Title
Abstract

The output power of a typical single-mode semiconductor laser is limited by its narrow waveguide width required to cut off high-order spatial modes. Conventional techniques rely on engineering the waveguide without introducing higherorder modes. In contrast, this work utilizes the concept of coupled-cavity (CC) structures. A single-mode lasing is achieved by employing a multi-mode and a neighboring single-mode waveguide. The CC approach is based on the resonant coupling of the high-order mode in the wide waveguide to the fundamental mode of a narrower lossy waveguide. First, geometrical dispersion of the CC lasers, such as their width, spacing, and their sensitivity to the resonance, was investigated. After optimizing the design, edge-emitting-lasers were fabricated using high-efficiency GaAs-based structures. Optical mode control and single-mode operation of the design are demonstrated through fundamental optical characterization measurements. The output power curves for the single and CC designs show similar slope efficiencies suggesting the proposed method as a promising approach towards high-power single lateral mode operation of edge-emitting lasers.

Course
Other identifiers
Book Title
Keywords
Semiconductor lasers, Single-mode, Waveguide coupling, Mode filtering, Coupled-cavity
Citation
Published Version (Please cite this version)