optical iris in for lasertechnische applications

摘要

The reflection layer is selectively effective for specified wavelengths. The laser apparatus generates two colinear, superimposed laser beams of different wavelengths. It contains a focussing objective and the perforated screen. Between the laser and the objective is mounted an intermediate lens for prefocussing of the laser beam. The perforated screen is mounted at the point of the intermediate prefocus, or it can be adjusted to this point. Together with the intermediate lens the screen is slidable relative to the objective in the optical axis direvtion. Thus the prefocus can be adjusted to the intermediate image plane of the objective corresponding to the respective object distance.