Synthetic-wavelength interferometry improved with frequency calibration and unambiguity range extension Weimann, Claudius ; Fratz, Markus ; Wölfelschneider, Harald ; Freude, Wolfgang ; Höfler, Heinrich ; Koos, Christian Abstract Publication: Applied Optics Pub Date: July 2015 DOI: 10.1364/AO.54.006334 Bibcode: 2015ApOpt..54.6334W