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3 October 2022 PicoSwitch: active X-Ray optics for hard X-Ray pulse shortening (Conference Presentation)
Mathias Sander, Daniel Schmidt, Peter Gaal
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Proceedings Volume PC12240, Advances in X-Ray/EUV Optics and Components XVII; PC1224008 (2022) https://doi.org/10.1117/12.2633542
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
We report on recent developments of solid state based Active X-ray Optics, namely a device that functions as a photoacoustic hard x-ray switch. This so-called PicoSwitch requires a femtosecond laser pulse to trigger the propagation of coherent sound waves to alter the lattice parameter of a specifically designed switching layer in the device heterostructure. The PicoSwitch employs the subsequent angular shift of the diffraction efficiency to slice an impinging synchrotron x-ray pulse to less than 10 ps duration. A major part of the development was carried out at the time-resolved endstation (ID09) of the European Synchrotron Radiation Facility where it is available upon user request. In our contribution we discuss the main operation parameters such as efficiency and on-off switching contrast as well as strategies for improving the device performance even further. In short, the PicoSwitch delivers hard x-ray pulses with a duration of 5-10 ps which are inherently synchronized with the excitation laser. Despite the relatively low efficiency (≈10-3) the device can deliver up to 109 photons/sec when utilized at high repetition rates. In our presentation will discuss benchmark experiments performed at various beamlines, e.g., the investigation of ultrafast lattice dynamics in thin films and superlattices.
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Mathias Sander, Daniel Schmidt, and Peter Gaal "PicoSwitch: active X-Ray optics for hard X-Ray pulse shortening (Conference Presentation)", Proc. SPIE PC12240, Advances in X-Ray/EUV Optics and Components XVII, PC1224008 (3 October 2022); https://doi.org/10.1117/12.2633542
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KEYWORDS
Hard x-rays
X-ray optics
Photoacoustic spectroscopy
Picosecond phenomena
Solid state physics
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