Title :
Phase-locking millimetre-wave klystrons for the measurement of submillimetre laser frequencies
Author_Institution :
National Physical Laboratory, Teddington, UK
Abstract :
A single-loop method of phase locking up to 100 GHz is described. Spectral broadening observed in harmonic mixing with an HCN laser at 891 GHz (with resolution 1 in 108) is attributed to phase noise and modulation on the base-reference quartz-crystal oscillator. Zero beats at 99 GHz between klystrons phase-locked to a common reference give frequency resolution of the order of 1 in 1013.
Keywords :
frequency measurement; gas lasers; klystrons; microwave devices; microwave measurement; 891 GHz; frequency synthesiser; klystrons; laser frequency measurement; mixer; noise; phase locking;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19710261
