Wang, K, Bai, H, Yu, C et al. (13 more authors) (2022) Independent Control of Mode Selection and Power Extraction in Terahertz Semiconductor Lasers. ACS Photonics, 9 (6). pp. 1973-1983. ISSN 2330-4022
Abstract
Mode selection and power extraction are the core of single-mode semiconductor lasers, but generally, they restrict each other. A large gain area with high radiation efficiency is necessary for high output power but will induce more competitive modes and increase the threshold gain of the desired mode. Here, we demonstrate a novel laser cavity─an active distributed Bragg reflector (ADBR) and a grating coupler (GC) are monolithically integrated into a laser ridge─enabling independent control of mode selection and power extraction. The ADBR features a reflection peak with an extremely narrow bandwidth that releases the constraint on the cavity length, while the GC provides a controllable high radiation efficiency. The concept is implemented onto terahertz quantum cascade lasers, exhibiting robust single-mode emission with high output power and high operating temperature. Given the universality of the ADBR and GC, our concept can be utilized in different material systems at different wavelengths.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 American Chemical Society. This is an author produced version of an article published in ACS Photonics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | quantum cascade laser, terahertz, active distributed Bragg reflector, grating, single mode, photonic crystals, monolithic integration |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/P021859/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Jul 2022 12:57 |
Last Modified: | 27 May 2023 00:13 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsphotonics.2c00011 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188570 |