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  • Received: Mar. 30, 2016

    Accepted: Nov. 18, 2016

    Posted: Jan. 28, 2019

    Published Online: Jul. 26, 2018

    The Author Email: Hua Li (hua.li@mail.sim.ac.cn)

    DOI: 10.3788/COL201715.011404

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    Yonghao Zhu, Hua Li, Wenjian Wan, Li Gu, Tao Zhou, Stefano Barbieri, Juncheng Cao. Beat note analysis and spectral modulation of terahertz quantum cascade lasers with radio frequency injection[J]. Chinese Optics Letters, 2017, 15(1): 011404

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Chinese Optics Letters, Vol. 15, Issue 1, 011404 (2017)

Beat note analysis and spectral modulation of terahertz quantum cascade lasers with radio frequency injection

Yonghao Zhu1, Hua Li1,*, Wenjian Wan1, Li Gu1, Tao Zhou1, Stefano Barbieri2, and Juncheng Cao1,3

Author Affiliations

  • 1Key Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 2Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot and CNRS, UMR 7162, 10 rue A. Domont et L. Duquet, Paris 75205, France
  • 3e-mail: jccao@mail.sim.ac.cn

Abstract

We demonstrate the electrical beat note analysis and radio frequency (RF) injection locking of a continuous wave (cw) terahertz quantum cascade laser (QCL) emitting around 3 THz (100 μm). In free running the beat note frequency of the QCL shows a shift of 180 MHz with increasing drive current. The beat note, modulation response, injection pulling, and terahertz emission spectral characteristics in the different current regimes I, II, and III are investigated. The results show that in the current regime I close to the laser threshold we obtain a narrower beat note and flat response to the RF modulation at the cavity round trip frequency. The pulling effect and spectral modulation measurements verify that in the current regime I the RF injection locking is more efficient and a robust tool to modulate the mode number and mode frequency of terahertz QCLs.