Published April 2009
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Phase-locking of a 2.7-THz quantum cascade laser to a mode-locked erbium-doped fibre laser
Abstract
We demonstrate phase-locking of a 2.7-THz metalmetal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier-chain (x2x3x2) from a microwave synthesizer at 15 GHz. Both laser and reference radiations are coupled into a hot electron bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. Spectral analysis of the beat signal (see fig. 1) confirms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
Additional Information
© 2009 Associated Universities, Inc. The authors acknowledge NASA-JPL for the use of a W-band power amplifier chain used for spectral tests of Herschel-HIFI.Attached Files
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- Eprint ID
- 65323
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- CaltechAUTHORS:20160311-153127878
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2016-03-12Created from EPrint's datestamp field
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Keck Institute for Space Studies