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      Tunable single-mode slot waveguide quantum cascade lasers

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      Tunable single-mode slot waveguide quantum cascade lasers.pdf (2.555Mb)
      Author
      Meng, Bo
      Tao, Jin
      Li, Xiao Hui
      Zeng, Yong Quan
      Wu, Sheng
      Wang, Qi Jie
      Date of Issue
      2014
      School
      School of Electrical and Electronic Engineering
      Research Centre
      Research Techno Plaza
      Version
      Published version
      Abstract
      We report experimental demonstration of tunable, monolithic, single-mode quantum cascade lasers (QCLs) at ∼10 μm with a two-section etched slot structure. A single-mode tuning range of 77 cm−1 (785 nm), corresponding to ∼7.8% of the relative tuning range, was realized with a ∼20 dB side mode suppression ratio within the whole tuning range. Compared with integrated distributed feedback QCLs, our devices have the advantages of easy fabrication and a broader tuning range. Further theoretical analyses and numerical simulations show that it is possible to achieve a broad continuous tuning range by optimizing the slot structures. The proposed slot-waveguide design could provide an alternative but simple approach to the existing tuning schemes for realizing broadly continuous tunable single-mode QCLs.
      Subject
      DRNTU::Engineering::Electrical and electronic engineering
      Type
      Journal Article
      Series/Journal Title
      Applied physics letters
      Rights
      © 2014 AIP Publishing LLC. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of AIP Publishing LLC. The paper can be found at the following official DOI: http://dx.doi.org/10.1063/1.4875711.  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
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      http://dx.doi.org/10.1063/1.4875711
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