Optical facet coatings for high-performance LWIR quantum cascade lasers at λ ∼ 8.5 &#181;m

Yuan MA; Yu-Zhe LIN; Chen-Yang WAN; Zi-Xian WANG; Xu-Yan ZHOU; Jin-Chuan ZHANG; Feng-Qi LIU; Wan-Hua ZHENG

doi:10.11972/j.issn.1001-9014.2024.04.009

Journals >Journal of Infrared and Millimeter Waves >Volume 43 >Issue 4 >Page 497 > Article

Journal of Infrared and Millimeter Waves
Vol. 43, Issue 4, 497 (2024)

Optical facet coatings for high-performance LWIR quantum cascade lasers at λ ∼ 8.5 µm

Yuan MA^1,2, Yu-Zhe LIN^1,*, Chen-Yang WAN^1,2, Zi-Xian WANG^1,2..., Xu-Yan ZHOU^1,3, Jin-Chuan ZHANG¹, Feng-Qi LIU¹ and Wan-Hua ZHENG^1,2,**|Show fewer author(s)

Author Affiliations

¹Laboratory of Solid-State Optoelectronics Information Technology，Institute of Semiconductors，Chinese Academy of Sciences，Beijing 100083，China

²Center of Materials Science and Optoelectronics Engineering，University of Chinese Academy of Sciences，Beijing 100049，China

³Weifang Academy of Advanced Opto-Electronic Circuits，Weifang 261021，China

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DOI: 10.11972/j.issn.1001-9014.2024.04.009 Cite this Article

Yuan MA, Yu-Zhe LIN, Chen-Yang WAN, Zi-Xian WANG, Xu-Yan ZHOU, Jin-Chuan ZHANG, Feng-Qi LIU, Wan-Hua ZHENG. Optical facet coatings for high-performance LWIR quantum cascade lasers at λ ∼ 8.5 µm[J]. Journal of Infrared and Millimeter Waves, 2024, 43(4): 497 Copy Citation Text

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Schematic diagram of the LWIR QCLs：（a） schematic diagram of the LWIR QCLs with AR and HR coatings applied to the front and back facets； scanning electron microscopy （SEM） images of coatings on （b） front and （c） back facet

Fig. 1. Schematic diagram of the LWIR QCLs：（a） schematic diagram of the LWIR QCLs with AR and HR coatings applied to the front and back facets； scanning electron microscopy （SEM） images of coatings on （b） front and （c） back facet

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Reflectivity curves：experimental and theoretically simulated reflectivity curves of （a） Al2O3 and （b） Y2O3 AR coatings，the inset shows the lasing spectrum of the LWIR QCL at 298 K

Fig. 2. Reflectivity curves：experimental and theoretically simulated reflectivity curves of （a） Al₂O₃ and （b） Y₂O₃ AR coatings，the inset shows the lasing spectrum of the LWIR QCL at 298 K

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Fig. 3. L-I-V and WPE curves of the QCLs at 298 K, (a) CW operation of uncoated and HR-AR (Al₂O₃ coating); (b) pulsed and (c) CW operation of uncoated, HR-only and HR-AR (Y₂O₃ coating); (d) measured lateral far-field profiles

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Fig. 4. SEM image of the front facet of the laser coated with (a) Al₂O₃ and (b) Y₂O₃ AR coating after testing

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Fig. 5. Predicted WPE and AR coating thickness as a function of front facet AR reflectivity，inset：the reflectivity curves for different Y₂O₃ AR coating thicknesses

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Fig. 6. L-I-V and WPE curves of the QCL with optimized front facet Y₂O₃ AR coating reflectivity under (a) pulsed and (b) CW operation at 298 K

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