VARIABLE ACOUSTO-OPTICAL FILTER ELEMENT

摘要

The invention relates to an acousto-optical filter element (114), which comprises an acousto-optical crystal (118) having an acousto-optical signal generator (120) for creating acoustic signals in the acousto-optical crystal (118). The acousto-optical crystal (118) is configured to selectively spatially deflect light having a target wavelength from an input light beam (116) entering the acousto-optical crystal (118), corresponding to a high frequency applied to the acoustic signal generator (120), and to create a target light beam (126) having the target wavelength. According to the invention, the acousto-optical filter element (114) comprises a spatial filter element (132) arranged in the target light beam (126), said filter element being configured to selectively suppress the intensity of the target light beam (126) in a plane vertical to the propagation direction of the target light beam (126).