期刊
APPLIED PHYSICS LETTERS
卷 100, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3679620
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资金
- CAS-KNAW
- AMSTAR+ project of RadioNet
- NWO
- CAS [KJXC2-EW-T05]
- National Natural Science Foundation of China [10621303]
- CAS Key Laboratory of Radio Astronomy
- NASA
- NSF
We report frequency locking of two 3.5-THz third-order distributed feedback (DFB) quantum cascade lasers (QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the electrical and temperature tuning coefficients. For both lasers, the frequency locking induces a similar linewidth reduction factor, whereby the narrowest locked linewidth is below 18 kHz with a Gaussian-like shape. The linewidth reduction factor and the ultimate linewidth correspond to the measured frequency noise power spectral density. (C) 2012 American Institute of Physics. [doi:10.1063/1.3679620]
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