| Autor: |
Fengqi Liu, Liu Shuman, Ke Yang, Liu Junqi, Lijun Wang, Jinchuan Zhang, Yu Ma, Ning Zhuo, Shenqiang Zhai, Wei-Jiang Li, Yuanyuan Li |
| Rok vydání: |
2021 |
| Předmět: |
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| DOI: |
10.21203/rs.3.rs-907795/v1 |
| Popis: |
We report a terahertz quantum cascade laser frequency comb (THz QCL FC) with low threshold current density, high power, and wide current dynamic range. The active region design with the semi-insulated surface plasma waveguide is beneficial to optimize the gain dispersion value and temperature stability. At 10K, the comb with 3-mm-long and 150-µm-wide is capable of emitting 22mW with the threshold current density Jth = 64.4 A·cm−2. The total spectral emission is of about 300 GHz centered around 4.6 THz. Without any extra dispersion compensation measures, the intermode beatnote map reveals stable frequency comb operating within a current dynamic range more than 97% and the narrowest beatnote linewidth is 7.2 kHz. The stable FC operation of a free-running THz QCL makes our device an ideal source for further development of dual-comb spectroscopy. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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