%0 Conference Proceedings
%T Phase-locking on the beat signal of a two-mode 2.7  terahertz metal-metal quantum cascade laser
%A Hovenier J.N.
%A Adam A.J.L.
%A Kašalynas I.
%A Gao J.R.
%A Klaassen T.O.
%A Baryshev A.
%A Williams B.S.
%A Kumar S.
%A Hu Q.
%A Reno J.L.
%S Proc. Symp. IEEE/LEOS Benelux Chapter
%D 2006
%F HovenierJ.N._etal2006
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=968), last updated on Tue, 25 May 2021 14:48:25 -0500
%X We have studied the linewidth and phase-locking of a 2.7 THz quantum cascade laser by using a superconducting bolometer mixer. The 8 GHz beat signal is compared with a microwave reference with a feedback to the laser bias current. Phase locking has been demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz. Under frequency-stabilization conditions we find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggestthat this linewidthdoes not approach the Schawlow-Townes limit.
%P 125-128