Citation: |
Pengchang Yang, Jinchuan Zhang, Zenghui Gu, Chuanwei Liu, Yue Zhao, Fengmin Cheng, Shenqiang Zhai, Ning Zhuo, Junqi Liu, Lijun Wang, Shuman Liu, Fengqi Liu. Coupled-ridge waveguide quantum cascade laser array lasing at λ ~ 5 µm[J]. Journal of Semiconductors, 2021, 42(9): 092901. doi: 10.1088/1674-4926/42/9/092901
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P C Yang, J C Zhang, Z H Gu, C W Liu, Y Zhao, F M Cheng, S Q Zhai, N Zhuo, J Q Liu, L J Wang, S M Liu, F Q Liu, Coupled-ridge waveguide quantum cascade laser array lasing at λ ~ 5 µm[J]. J. Semicond., 2021, 42(9): 092901. doi: 10.1088/1674-4926/42/9/092901.
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Coupled-ridge waveguide quantum cascade laser array lasing at λ ~ 5 µm
DOI: 10.1088/1674-4926/42/9/092901
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Abstract
In this work, we demonstrated high-power quantum cascade laser (QCL) arrays lasing at λ ~ 5 µm by employing an optimized coupled-ridge waveguide (CRW) structure. Five-element QCL arrays were simulated and fabricated through a two-step etching method to extend the CRW structure to a mid-wave infrared regime. A lateral far-field with the main peak near a diffraction-limited intensity curve of about 10° was observed by properly designing a geometric shape of the ridges and interspaces. By introducing a buried 2nd-order distributed feedback (DFB) grating, substrate emission with a radiation power above 1 W at 25 °C is achieved. Single longitudinal mode operation is obtained by changing the temperature of the heatsink with a good linear wavelength tuning coefficient of –0.2 cm–1/K. -
References
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