Yuhang Ma, Hao Wu, Zaijin Li, Jianwei Zhang, Xing Zhang, Chao Chen, Yongqiang Ning, Yi Qu, Hangyu Peng, Li Qin, Lijun Wang. 4 μ m Waveband Widely Tunable External Cavity Quantum Cascade Laser[J]. Chinese Journal of Lasers, 2023, 50(11): 1101020
- Chinese Journal of Lasers
- Vol. 50, Issue 11, 1101020 (2023)
![Schematic of conduction band of QCL[12]](/richHtml/zgjg/2023/50/11/1101020/img_01.jpg)
Fig. 1. Schematic of conduction band of QCL[12]
Fig. 2. Schematic of EC-QCL with Littrow structure
Fig. 3. Structural diagrams of EC-QCL
Fig. 4. Relationship between diffraction efficiency of blazed grating and wavelength under different incident polarized electric-field directions. (a) Grating with groove spacing of 450 line/mm; (b) grating with groove spacing of 300 line/mm
Fig. 5. Tuning characteristics of EC-QCL under different gratings. (a) Grating with groove spacing of 450 line/mm; (b) grating with groove spacing of 300 line/mm
Fig. 6. SMSR of EC-QCL underdifferent gratings. (a) Grating with groove spacing of 450 line/mm; (b) grating with groove spacing of 300 line/mm
Fig. 7. Spot images captured at different working distances using different blazed gratings
Fig. 8. Power curves of lasers under different blazed gratings
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Table 1. Laser performance parameters under different blazed gratings
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