| abstract |
Interferometric measuring systems are known. They contain a light source for generating coherent light and an interferometer structure consisting of at least one beam splitter and two reflectors and lenses for focusing the light beam.n n n According to the invention, such a measuring system is used to examine the light bundle (30) emitted by a laser light source (1) for frequency, modes, mode stability, mode distribution, and coherence length and coherence time, etc. The light bundle (30) is made parallel by a lens and then passes through the beam splitter (3) in two sub-bundles (31, 32) to the reflectors (4, 5). One of the two sub-bundles runs through a reference interference pattern (7). Both sub-bundles (31, 32) interfere with each other and are fed to a photo receiver (10) via an optical system to reduce the numerical aperture.n n n It is particularly advantageous if as many optical components as possible, in particular the lens (2), the beam splitter (3), the reflectors (4, 5) and the reference interference pattern (7) are monolithically integrated on a block (6). |