VOGLER, KLAUS,KITTELMANN, OLAF,BUETTNER, EDLEF,POPIEN, JAN
申请号：
CA3048972
公开号：
CA3048972A1
申请日:
2018.03.05
申请国别(地区):
CA
年份:
2018
代理人:
摘要：
A laser device (10) for material processing, in particular for laser processing of a human eye (12), comprises a source (14) of a pulsed laser beam (16), a detector system for the photodetection of a plurality of partial beams (16', 16'') generated from the laser beam by radiation outcoupling and provision of corresponding detection signals, and a control unit (24) linked to the detector system for evaluating the detection signals. A first detection signal is provided by a first detection element (32) of the detector system, which signal is based on single-photon absorption. A second detection signal is provided by a second detection element (34) of the detector system, which signal is based on two-photon absorption. In certain embodiments, the control unit puts the measured signal strengths of the two detection signals into a ratio to one another. Assuming a uniform pulse repetition rate of the laser beam (16) and an unchanged average power of the laser device, variations in the resulting ratio value can then be traced back to variations in the pulse duration or/and wave front of the laser beam 16. The beam quality of the laser beam can be maintained during the emission operation of the laser device in that the control unit initiates suitable countermeasures.
