期刊
APPLIED SCIENCES-BASEL
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/app11041416
关键词
terahertz lasers; quantum cascade lasers; intracavity difference frequency generation
类别
资金
- MIC/SCOPE [195006001]
- Qombs Project, EU-H2020-FET Flagship on Quantum Technologies [820419]
- EC-H2020 Laserlab-Europe grant [871124]
This article presents the ultra-broadband THz emission obtained by intra-cavity mixing of different wavelengths, as well as the characterization and measurement methods of this emission. The new device can operate at low temperatures without the need for expensive liquid helium cooling, offering high stability and frequency accuracy.
Terahertz quantum cascade laser sources based on intra-cavity difference frequency generation from mid-IR devices are an important asset for applications in rotational molecular spectroscopy and sensing, being the only electrically pumped device able to operate in the 0.6-6 THz range without the need of bulky and expensive liquid helium cooling. Here we present comb operation obtained by intra-cavity mixing of a distributed feedback laser at lambda = 6.5 mu m and a Fabry-Perot device at around lambda = 6.9 mu m. The resulting ultra-broadband THz emission extends from 1.8 to 3.3 THz, with a total output power of 8 mu W at 78 K. The THz emission has been characterized by multi-heterodyne detection with a primary frequency standard referenced THz comb, obtained by optical rectification of near infrared pulses. The down-converted beatnotes, simultaneously acquired, confirm an equally spaced THz emission down to 1 MHz accuracy. In the future, this setup can be used for Fourier transform based evaluation of the phase relation among the emitted THz modes, paving the way to room-temperature, compact, and field-deployable metrological grade THz frequency combs.
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