Phase locking of a 2.5 THz quantum cascade laser to a microwave reference using THz Schottky mixer

Abstract

The frequency of a 2.5 THz QCL are stabilized to sub-hertz accuracy by phase-locking to a stable 100 MHz microwave reference, using a 2.3-3.2 THz room temperature Schottky diode based harmonic mixer. The down-converted phase locked beat note is stable over a long term test.