Patent ID: 8711367

Claim:
A position-measuring device for ascertaining a position of two objects which are disposed in a manner allowing movement relative to each other in at least one measuring direction, comprising: a light source; a splitter device, by which a light beam, provided by the light source, is split into at least two partial beams of rays; at least two partial-beam paths traversed by the partial beams of rays; and a plurality of opto-electronic detector elements arranged to receive interfering partial beams of rays from the partial-beam paths, displacement-dependent position signals ascertainable via the detector elements; wherein the light source includes a semiconductor laser having fiber-grating a feedback device to operate the light source in pulsed manner; and wherein the semiconductor laser and the fiber-grating feedback device are coupled at least partially to a temperature-setting device adapted to operate the semiconductor laser and the fiber-grating feedback device at temperatures at which a phase jitter of the displacement-dependent position signals is minimized.