Directional ultrafast X-ray separation imaging device driven by femtosecond laser and application

Abstract

The invention provides a directional ultrafast X-ray separation imaging device driven by femtosecond laser and an application of the device. The device comprises a high-power Ti sapphire femtosecond laser, a pumping bunch, an ultrafast event sample, n X-ray probe bunches and an X-ray imaging plate. Time serialized femtosecond laser pulse and a gas target interact to produce an ultrashort X-ray sequence with the same time sequence, the X-ray sequence sequentially irradiates ultrafast events and reads transient image signals of ultrafast events, and unrepeatable ultrafast process requiring subpicosecond time resolution can be imaged and recorded once. The device uses a design scheme of circumferential symmetric non-coaxial separation imaging and reduces view angle difference of non-coaxial image to the greatest extent.

Description

technical field [0001] The invention relates to the field of ultrafast X-ray imaging, in particular to a femtosecond laser-driven directional ultrafast X-ray framing imaging device and its application. Background technique [0002] In the research of physics, chemistry, and biology, it is often necessary to perform precise imaging of a process at very short time intervals to reveal the dynamic laws of these processes and then control them. Different ultrafast processes have different time characteristics, so the requirements for time resolution are also different. For example, fracture and collision processes require sub-millisecond time resolution, and excitation processes such as explosions and shock waves require sub-microsecond time resolution. Nanosecond time resolution is required for the protein folding process, and picosecond time resolution is required for the decay and migration of phonons in solids, phase solution time in liquids, and molecular vibrational relaxat...

AI Technical Summary

Problems solved by technology

For single, non-repeatable events, only ultra-fast framing imaging can be used. At present, ultra-fast framing imaging in the X-ray band is limited. The main limitations come from two aspects: one is the lack of time-serialized Ultra-fast X-ray light source, on the other hand, for the framing image of coaxial transmission, the response speed of imaging equipment limits the framing frequency. At present, X-ray imaging equipment basically operates in single-frame mode

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