1. Phase Locking of a 2.7 THz Quantum Cascade Laser to a Microwave Reference
- Author
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Khosropanah, P, Baryshev, A, Zhang, W, Jellema, W, Hovenier, J. N, Gao, J. R, Klapwijk, T. M, Paveliev, D. G, Williams, B. S, Hu, Q, Reno, J. L, Klein, B, and Hesler, J. L
- Subjects
Optics - Abstract
We demonstrate the phase locking of a 2.7 THz metal-metal 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 (x 12) from a microwave synthesizer at approx. 15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. The spectral analysis of the beat signal confirms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
- Published
- 2009