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Chin. Phys. B, 2020, Vol. 29(12): 127302    DOI: 10.1088/1674-1056/abc0da
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Electron dynamics of active mode-locking terahertz quantum cascade laser

Qiushi Hou(侯秋实)1, 2, Chang Wang(王长)1, 2,†, and Juncheng Cao(曹俊诚)1, 2,
1 Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; 2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  The pulse generation from active mode-locking terahertz quantum cascade laser is studied by Maxwell-Bloch equations. It is shown that longer dephasing time will lead to multiple pulses generation from the laser. The dependence of output field on modulation length and radio-frequency parameters is obtained. In order to achieve short pulse generation, the DC bias should close to threshold value and modulation length should be shorter than 0.256 mm. The output pulse is unstable and the envelope shows many oscillations in the presence of spatial hole burning, resulting destabilization of mode-locking.
Keywords:  terahertz (THz)      quantum cascade lasers (QCLs)      mode-locking      spatial hole burning (SHB)  
Received:  06 July 2020      Revised:  30 September 2020      Published:  26 November 2020
PACS:  73.43.Cd (Theory and modeling)  
  78.30.Fs (III-V and II-VI semiconductors)  
  42.60.Fc (Modulation, tuning, and mode locking)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFF0106302), the National Natural Science Foundation of China (Grant Nos. 61975225 and 61927813), and Shanghai International Cooperation Project, China (Grant No. 18590780100).
Corresponding Authors:  Corresponding author. E-mail: cwang@mail.sim.ac.cn Corresponding author. E-mail: jccao@mail.sim.ac.cn   

Cite this article: 

Qiushi Hou(侯秋实), Chang Wang(王长), and Juncheng Cao(曹俊诚) Electron dynamics of active mode-locking terahertz quantum cascade laser 2020 Chin. Phys. B 29 127302

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