Ying Liu, Tao Jiang, Qi Yang, Xuemin Wang, Zhiqiang Zhan, Ruijiao Zou, Jiawen Luo, Long Fan, Fengwei Chen, Weidong Wu. Study on grating feedback characteristics of distributed feedback quantum cascade laser[J]. High Power Laser and Particle Beams, 2022, 34(11): 111005
- High Power Laser and Particle Beams
- Vol. 34, Issue 11, 111005 (2022)
Fig. 1. Schematic diagram of grating
Fig. 2. Diagram of grating structures
Fig. 3. Reflection spectra at different grating positions
Fig. 4. Transverse mode distribution in two structures
Fig. 5. Angle of side wall of grating and the relationship between dip angle, wavelength and reflectivity of grating
Fig. 6. Influence of grating angle on cavity loss
Fig. 7. Grating coupling coefficient varies with duty ratio and etching depth
Fig. 8. Relationship between etching depth of grating and coupling coefficient
Fig. 9. Relationship between etching depth, wavelength and reflectivity of the period
Fig. 10. Influence of etching depth of grating on loss
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Table 1. Epitaxial layer structure
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