Setup for High-Speed Synchrotron X-Ray Imaging of Laser Drilling at the DESY

It is used to capture X-ray imaging sequences of a laser drilling process with an ultrafast Yb:YAG laser with an output wavelength of 1030 nm. The polarization could be adjusted by two λ/4 and λ/2 waveplates which were placed between the laser source and the focusing f-theta lens.

A sample of thickness t is transmitted by the X-ray beam of diameter about 2 mm in y-direction. At a distance of about 3.5 m behind the sample, a scintillator converts the X-ray beam into visible light, which is captured by a high-speed camera at a frame rate of 1000 fps and a spatial resolution of 856 pixels/mm. In addition, the measurement beam of an optical coherence tomography (OCT) is aligned coaxially with the processing laser beam using a dichroitic mirror.