Journal of Infrared and Millimeter Waves, Volume. 42, Issue 6, 762(2023)

Progress in the study of nonlinear dynamic characteristics based on quantum cascade lasers

Wei FENG1, Yu MAO1, Yue MENG1, Tian-Liang RENG1, Chang WANG2,3、*, and Jun-Cheng CAO2,3、**
Author Affiliations
  • 1School of Physics and Electronic Engineering,Jiangsu University,Zhenjiang 212013,China
  • 2National Key Laboratory of Materials for Integrated Circuits,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China
  • 3Center of Material Science and Optoelectronic Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
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    Figures & Tables(6)
    (a) Optical spectra vs. pumping ratio (j/jth) above threshold obtained in cw at 300 K with a 3-μm-wide buried heterostructure laser emitting at 8.47 μm. For 1<j/jth<1.2 the spectra are identical to j/jth=1.2,(b) spectral splitting and twice the Rabi frequency ΩRabi2π vs. square root of output power collected from a single laser facet. The dashed line is a least-square linear fit of the data[19]
    (a) Experimental time traces of the QCL under the optical feedback at 77 K. The polarizer allows achieving the value of feedback ratio f between 0 and 0.089,a) f = 0,b) f = 0.000 3,c) f = 0.000 8,d) f = 0.004 6,e) f = 0.014 1,f) f = 0.021 3,g) f = 0.029 8,h) f = 0.039 3,i) f = 0.089,(b) simulation of the upper state lifetime evolution with temperature for the QCL under study[30]
    Time series of extreme pulses[14,31]
    Fix one of the external cavities with the length 0.75 m and the feedback strength 0.22,(a) another external cavity with the length 0.45 m and the feedback strength 0.022,(b) Fourier spectrum corresponding to (a),(c) another external cavity with the length 0.6 m and the feedback strength 0.022,(d) Fourier spectrum corresponding to (c)
    Local bifurcation diagram of an injection-locked QC laser for linewidth enhancement factor (LEF) values of 0,0.5,1.0,and 2.5. The solid line is the saddle node (SN) bifurcation and the dashed line is the Hopf bifurcation. The supercritical bifurcation is denoted by the thick lines while the subcritical bifurcation by the thin lines. The stable locking regime is bounded by the supercritical bifurcations. The investigated laser is operating in the stable locked region of the bifurcation diagram with an LEF of 0.5,where the vertical dotted line indicates an injection ratio of 5.0[40]
    (a) Time series under sine wave signal modulation,(b) RF spectrum under sine wave signal modulation,(c) time series under square wave signal modulation,(d) RF spectrum under square wave signal modulation. I: continuous pump current,A: peak-to-peak amplitude of the modulation,F: frequency of the modulation[48]
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    Wei FENG, Yu MAO, Yue MENG, Tian-Liang RENG, Chang WANG, Jun-Cheng CAO. Progress in the study of nonlinear dynamic characteristics based on quantum cascade lasers[J]. Journal of Infrared and Millimeter Waves, 2023, 42(6): 762

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    Paper Information

    Category: Research Articles

    Received: Feb. 21, 2023

    Accepted: --

    Published Online: Dec. 26, 2023

    The Author Email: Chang WANG (cwang@mail.sim.ac.cn), Jun-Cheng CAO (jccao@mail.sim.ac.cn)

    DOI:10.11972/j.issn.1001-9014.2023.06.009

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