Höfler, H.H.HöflerKulmus, K.K.KulmusMolnar, J.J.MolnarSchröder, C.C.Schröder2022-03-032022-03-031990https://publica.fraunhofer.de/handle/publica/178702Fluctuations of the refractive index of air causes nowadays the largest errors in high precise interferometric displacement measuring systems. We present in this paper a new method for compensating these influences by tuning the optical frequency of the laser. Variing laser temperature and current regulates the frequency (wavelength) of a GaAlAs-semiconductor laser in such a manner, that the wavelength in air is constant.deBrechzahleinflußcontrolling of wavelengthdistance measurementeigen frequency interferometerEigenfrequenzinterferometerinfluence by refractive indexinterferometersignal processingSignalverarbeitungtwo frequency interferometerWegmessungWellenlängenregelungZweifrequenzinterferometer621681journal article