Zhaolong Xu, Yan Xie, Yingxin Wang, Ziran Zhao, Weidong Chu, Dejun Feng. Self-Mixing Interferometry with Terahertz Quantum Cascade Lasers[J]. Acta Optica Sinica, 2020, 40(11): 1114003
- Acta Optica Sinica
- Vol. 40, Issue 11, 1114003 (2020)
Fig. 1. Schematic of self-mixing interference F-P cavity model
Fig. 2. Schematic of THz-QCL self-mixing interference spectral analysis system
Fig. 3. Self-mixing signal and spectrum of THz-QCL when I=0.645 A. (a) Self-mixing signal; (b) spectrogram
Fig. 4. Measured laser spectra under different ΔLtotal when I=0.645 A
Fig. 5. Laser spectra under different driving currents
Fig. 6. Self-mixing signal and spectrum of terminal voltage of THz-QCL when I=0.7 A. (a) Self-mixing signal; (b) spectrogram
Fig. 7. Comparison of self-mixing interference signals with theoretical simulations under different currents. (a) I=0.623 A; (b) I=0.645 A; (c) I=0.655 A
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Table 1. Calculated results of feedback optical coupling coefficients and linewidth enhancement factors under different driving currents
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