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Open AccessArticle

Operating Characteristics of High-Order Distributed Feedback Polymer Lasers

1
Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
2
Department of Electrical Engineering and Computer Science, Samueli School of Engineering, University of California Irvine, Irvine, CA 92697, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Polymers 2019, 11(2), 258; https://doi.org/10.3390/polym11020258
Received: 13 January 2019 / Revised: 31 January 2019 / Accepted: 1 February 2019 / Published: 3 February 2019
(This article belongs to the Special Issue Laser processing in polymer research)
In this study, high-order distributed-feedback (DFB) polymer lasers were comparatively investigated. Their performance relies on multiple lasing directions and their advantages include their high manufacturing tolerances due to the large grating periods. Nine laser cavities were fabricated by spin-coating the gain polymer films onto a grating structure, which was manufactured via interference lithography that operated at the 2nd, 3rd, and 4th DFB orders. Low threshold lasing and high slope efficiency were achieved in high-order DFB polymer lasers due to the large grating groove depth and the large gain layer thickness. A high-order DFB configuration shows possible advantages, including the ability to control the lasing direction and to achieve multiple-wavelength lasers. Furthermore, our investigation demonstrates that the increase in threshold and decrease in slope efficiency with an increase in the feedback order can be limited by controlling the structural parameters. View Full-Text
Keywords: polymer lasers; high-order; laser threshold; slope efficiency polymer lasers; high-order; laser threshold; slope efficiency
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MDPI and ACS Style

Zhou, P.; Niu, L.; Hayat, A.; Cao, F.; Zhai, T.; Zhang, X. Operating Characteristics of High-Order Distributed Feedback Polymer Lasers. Polymers 2019, 11, 258.

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