Patent ID: 7675019

Claim:
Method for adjusting of at least one light beam in an optical system defining a beam path, the method comprising the following steps: coupling-in a light beam of the optical system at a coupling-in point into a device for adjusting the light beam and thereby generating a coupled in light beam in the device, the device defining an optical axis; directing the coupled in light beam to at least two photo detectors wherein each of the photo detectors is mounted on a housing part of the device and disposed apart from the beam path at different distances from the coupling-in point of the coupled in light beam; determining the deviation of the coupled in light beam from a nominal position by means of the electrical signals of at least two photo detectors; and adjusting at least one optical element of the optical system to bring the coupled in light beam into the nominal position, therefore adjusting the light beam to propagate along the beam path in the optical system,