PDF] A simple heterodyne laser interferometer without periodic errors | Semantic Scholar
A portable miniaturized laser heterodyne radiometer (mini-LHR) for remote measurements of column CH4 and CO2 | SpringerLink
Heterodyne laser system used to characterize laser stability | Download Scientific Diagram
Two-color heterodyne laser interferometry for long-distance stage measurement with correction of uncertainties in measured optical distances | Scientific Reports
Self-heterodyne linewidth measurement, explained by RP Photonics Encyclopedia; interferometer, single-frequency laser