Laser arrangement and method for increasing the service life of optical elements in a laser arrangement

摘要

Laser arrangement with • a first optical element (3) which is provided and configured to convert a first laser beam (1) with a first frequency into a second laser beam (2) with a second frequency, the second frequency being greater than the first Frequency, the first optical element (3) being a nonlinear crystal which has an entry surface and an exit surface which are arranged plane-parallel to one another, the first optical element (3) being arranged such that the first laser beam (1) in an angle of incidence on the first optical element (3) that corresponds to the Brewster angle, • a second optical element (5) that is transparent to the first laser beam (1) and reflective to the second laser beam (2), and that is provided and set up to reflect the second laser beam (2) in a reflection direction (R), the second optical element (5) being a dichroic mirror , which has an entry surface and an exit surface which are arranged plane-parallel to one another, characterized in that the first optical element (3) and the second optical element (5) are arranged parallel to one another such that the second optical element (5) is arranged in such a way is that the first laser beam (1) and / or the second laser beam (2) strike the second optical element (5) at an angle of incidence that corresponds to the Brewster angle, that the first optical element (3) and the second optical Element (5) are arranged on a common movement device which enables the first optical element (3) and the second optical element (5) to move together, so that the first optical element (3) and the second optical element (5) are relative can be moved to a direction of light propagation of the second laser beam (2) and that the second optical element (5) along an entry surface for the first laser beam (1) and / or which can move the second laser beam (2) so that the second laser beam (2) reflected by the second optical element (5) does not travel, but is always reflected out of the laser arrangement at the same position.