期刊
APPLIED PHYSICS LETTERS
卷 101, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4751247
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资金
- CAS-KNAW Joint PhD Training Programme
- AMSTAR+ project of RadioNet under FP7
- NWO
- NATO SFP
- National Natural Science Foundation of China [11127903, 10933005]
- CAS program [KJXC2-EW-T05]
- CAS Key Laboratory of Radio Astronomy
- NASA
- NSF
We demonstrate an experimental scheme to simultaneously stabilize the frequency and amplitude of a 3.5 THz third-order distributed feedback quantum cascade laser as a local oscillator. The frequency stabilization has been realized using a methanol absorption line, a power detector, and a proportional-integral-derivative (PID) loop. The amplitude stabilization of the incident power has been achieved using a swing-arm voice coil actuator as a fast optical attenuator, using the direct detection output of a superconducting mixer in combination with a 2nd PID loop. Improved Allan variance times of the entire receiver, as well as the heterodyne molecular spectra, are demonstrated. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4751247]
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