PT Journal
AU Khosropanah P.
   Baryshev A.
   Zhang W.
   Jellema W.
   Hovenier J.N.
   Gao G.R.
   Klapwijk T.M
   Paveliev D.G.
   Williams B.S.
   Kumar S.
   Hu Q.
   Reno J.L.
   Klein B.
   Hesler J.L.
TI Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference
SO Optics Letters
PY 2009
BP 2958
EP 2960
VL 34
AB 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 amicrowave synthesizer at ~ 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 con-firms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
ER