Journal
OPTICS EXPRESS
Volume 29, Issue 18, Pages 29412-29422Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.433938
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Funding
- National Natural Science Foundation of China [61704181, 61991432, 62022084, 61875220, 62035005, 61927813]
- Ministry of Science and Technology of the People's Republic of China [2017YFF0106302]
- Chinese Academy of Sciences [YJKYYQ20200032, ZDBS-LY-JSC009]
- Science and Technology Commission of Shanghai Municipality [20XD1424700]
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This work presents an improved frequency comb and dual-comb operation of terahertz QCLs by utilizing a symmetric thermal dissipation scheme. It shows that the symmetric thermal dissipation results in more uniform thermal conduction and lower maximum temperature compared to the traditional asymmetric scheme. This approach could be widely adopted for applications such as spectroscopy, imaging, and near-field applications.
In the terahertz frequency range, the quantum cascade laser (QCL) is a suitable platform for the frequency comb and dual-comb operation. Improved comb performances have been always much in demand. In this work, by employing a symmetric thermal dissipation scheme, we report an improved frequency comb and dual-comb operation of terahertz QCLs. Two configurations of cold fingers, i.e., type A and B with asymmetric and symmetric thermal dissipation schemes, respectively, are investigated here. A finite-element thermal analysis is carried out to study the parametric effects on the thermal management of the terahertz QCL. The modeling reveals that the symmetric thermal dissipation (type B) results in a more uniform thermal conduction and lower maximum temperature in the active region of the laser, compared to the traditional asymmetric thermal dissipation scheme (type A). To verify the simulation, experiments are further performed by measuring laser performance and comb characteristics of terahertz QCLs emitting around 4.2 THz mounted on type A and type B cold fingers. The experimental results show that the symmetric thermal dissipation approach (type B) is effective for improving the comb and dual-comb operation of terahertz QCLs, which can be further widely adopted for spectroscopy, imaging, and near-field applications. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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