Ponnampalam, L;
Fice, MJ;
Renaud, C;
Seeds, AJ;
Freeman, JR;
Mohandas, RA;
Linfield, EH;
(2019)
Continuously Tunable Coherent THz Synthesizer, Referenced to Primary Frequency Standards.
In:
2019 International Topical Meeting on Microwave Photonics (MWP).
IEEE: Ottawa, ON, Canada.
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Abstract
We present a highly coherent tunable THz source based on an optical frequency comb generator with frequencies referenced to primary frequency standards. The THz synthesizer is continuously tunable from 122.5 GHz to greater than 2.7 THz, with a spectral resolution of 10’s of Hz and a frequency accuracy of 1 part in 10 12 . The composite noise has been measured up to a record frequency of 300 GHz, and is -75 dBc/Hz at an offset frequency of 10 kHz, limited by the scaled phase noise of the reference synthesizer. A 2 THz quantum cascade laser with an output power of $\sim 2$ mW has been injection locked to the absolute frequency referenced, high spectral purity THz synthesizer to realize a high power, narrow linewidth source suitable for high-resolution spectroscopy.
| Type: | Proceedings paper |
|---|---|
| Title: | Continuously Tunable Coherent THz Synthesizer, Referenced to Primary Frequency Standards |
| Event: | 2019 International Topical Meeting on Microwave Photonics (MWP) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/MWP.2019.8892129 |
| Publisher version: | https://doi.org/10.1109/MWP.2019.8892129 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | optical frequency comb, photonic THz generation, coherent, tunable, optical heterodyning, quantum cascade laser, phase noise, injection locking |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10087619 |
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