Yuhang Ma, Hao Wu, Zaijin Li, Jianwei Zhang, Xing Zhang, Chao Chen, Yongqiang Ning, Yi Qu, Hangyu Peng, Li Qin, Lijun Wang. An Ultra-Broad Tunable Mid-Infrared Laser Based on Beam Combination of Dual Gain Chips[J]. Acta Optica Sinica, 2023, 43(11): 1114003
- Acta Optica Sinica
- Vol. 43, Issue 11, 1114003 (2023)
Fig. 1. Energy band diagram of QCL
Fig. 2. Schematic of EC-QCL with Littrow structure
Fig. 3. Structure diagram of ultra-broad tunable external cavity mid-infrared laser (QCL chip 1 is a 4.0 μm waveband gain chip and QCL chip 2 is a 4.6 μm waveband gain chip)
Fig. 4. Diffraction efficiency of blazed grating (grating model is GR1325-30035, the size is 12.5 mm×25 mm×9.5 mm, the design wavelength is 3.5 μm, the grating constant is 300 lines/mm, and the blazed angle is 26.5°)
Fig. 5. 3-5 μm ultra-wide wavelength tuning spectra. The dotted line is the splitter transmittance curve and the solid lines are normalized intensity
Fig. 6. Side-mode suppression ratio of EC-QCL under different wave bands. (a) 4.0 μm; (b) 4.6 μm
Fig. 7. Power curves of two waveband lasers
Fig. 8. Curves of laser power changing with wavelength
Fig. 9. Spot shape obtained by spot analyzer at 20 cm
Fig. 10. Intensity characterization of spot shape in x and y directions (spot size at 1/e2 has been marked). (a) x direction; (b) y direction
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Table 1. Performance parameters of laser system under 300 lines/mm grating
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