Reflective target (97) continuously tracked, and the laser tracker to determine the distance to the target (97) (90), and emits a measuring beam (96) and is reflected at the target (97) receiving at least a portion of the measurement beam (96) has, and a beam changing unit (95). Distance variation of the laser tracker (90) further includes measuring beam (96) is such that there a coherent longitudinal single-mode, which has a laser diode that forms the measurement beam (96), to the target (97) an interferometer to determine the, and an absolute distance measuring unit for obtaining the measured distance values for the distance to the target (97). Control and evaluation unit, the interferometer wavelength of the measurement beam (96) is configured to be determined by while changing the distance to the target (97) a predetermined sample measurement are performed. Sample measurement can be carried out in at least two different distances to the target (97), the measurement beam (96) is always oriented to the target (97), while also maintaining the interferometer wavelength in a stable state, Interferometer output quantity relating to at least two different distances each to the target (97) is obtained. Additionally, supplied by at least two measured distance values are absolute distance measuring unit for at least two different distances to the target (97), also interferometric wavelength of the measurement beam (96) at least, at least two measured distance values and It is determined on the basis of the interferometer output amount determined.
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