| 摘要 |
Disclosed is an array for modifying a wavefront of an optical beam ( 3 ) having a beam axis ( 15 ). Said array comprises an influencing unit ( 1 ) which can be introduced into the beam path of the optical beam ( 3 ) and a heat source ( 12 ) that generates a thermal pattern and acts upon the influencing unit ( 1 ). The influencing unit ( 1 ) is provided with at least one planar cooling plate ( 7 a, 7 b) that extends transversal to the optical axis ( 15 ) of the incident beam ( 3 ) and a fluid layer or gel layer ( 9 ) which has a two-dimensional expansion, is disposed on the cooling plate with a basal surface, and absorbs the heat of the heat source. The two-dimensional expansion is large enough to receive approximately the entire cross section of the beam. The thickness of the fluid layer or gel layer ( 9 ) is embodied in such a small manner that only a minute amount of heat can flow perpendicular to the beam axis ( 15 ) while being thick enough for the wavefront of the incident beam ( 3 ) to be modified by the heat pattern resulting from thermal impingement of the fluid or gel ( 9 ). The wavefront of a beam can thus be influenced in an inexpensive-and tailor-made manner. Bearns that are influenced in such a way can preferably be used in high-power lasers for creating custom modes.
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