Precise measurements in millimeter and submillimeter-wave range based on phase-locked primary radiation sources

Exclusive kind of microwave radiation generators continuously covering whole millimeter and submillimeter wave range are backward wave oscillator (BWO) tubes. Series of such tubes was developed by Golant with coauthors in sixties and now are commercially available from "Istok" (Fryazino, Moscow region). The report is devoted to a new developments of phase lock loop (PLL) kind of frequency stabilization systems for these sources in the range up to beyond Terahertz as well as application of these systems for scientific and technical measurements.