Patent ID: 7420740

Claim:
Method for the combination of beam paths of a first, substantially nonpolarized light beam of a first wavelength interval of a first light source, of a second, substantially nonpolarized light beam of a second wavelength interval of a second light source and of a third, substantially nonpolarized light beam of a third wavelength interval of a third light source, the first wavelength interval being located between the second and the third wavelength interval and the method comprising the steps of: combining the beam paths of the second light beam and of the third light beam to a first combined beam path, such that substantially the degree of polarization of the particular light beams is not affected; and combining the beam path of the first light beam with the first combined beam path, such that the degree of polarization of the particular light beams is not substantially affected; wherein, for the combination of the beam paths of the second and of the third light beam, the light sources are oriented such that the beam paths of the second and of the third light beam intersect and in the region of the intersection an interference filter is placed, which transmits the second light beam and reflects the third light beam.