Picosecond laser-driven ultrafast X-ray dynamic imaging method

Abstract

The invention provides a picosecond laser-driven ultrafast X-ray dynamic imaging method which comprises the following steps: generating kilojoules picosecond laser pulses by using a chirped pulse technology, and splitting the laser pulses into 10 beams; after each beam of light passes through a delay light path, the beams of light reach the corresponding gas targets in sequence within 10ps; each beam of light reaches the X-ray radiation generated by the corresponding gas target to be directionally emitted and passes through the excited ultrafast event in the sample; and ten IP boards are usedfor receiving images so that ten backlight imaging pictures of the ultrafast event with the time interval of 1 ps are obtained, and the change process of the ultrafast event within 10 ps is reflected.According to the picosecond laser-driven ultrafast X-ray dynamic imaging method, the time resolution of X-ray backlight imaging is improved, and dynamic imaging of ps-level ultrafast events is realized.

Description

technical field [0001] The invention provides a picosecond laser-driven ultrafast X-ray dynamic imaging method, which belongs to the technical field of dynamic imaging. Background technique [0002] The most common method for probing the transient structure and ultrafast dynamics of matter is X-ray backlight imaging using X-rays generated by ultrafast and ultraintense lasers. The Betatron radiation source based on laser plasma acceleration has great advantages in this respect, because the broad-band X-ray beam it produces has a small divergence angle and a high number of photons, which is very suitable for backlight imaging of transient sample substances. Betatron X-ray radiation has been used in the fields of biology and medicine, such as X-ray phase-contrast imaging of insects and hard X-ray photography of bones, all of which utilize its spatial coherence and can perform ultra-fine resolution of substances. It is also ultrafast, making it ideal for dynamic studies of high...

AI Technical Summary

Problems solved by technology

[0004] However, the existing X-ray radiography technology cannot dynamically image the ultrafast process (time scale of ps order)

For example, if you want to observe a non-repeatable ultrafast event with a duration of 10 ps and image it every 1 ps, using the existing single-pulse imaging technology, the corresponding laser targeting frequency should reach 10 9 h Z , the existing technical conditions are far from meeting this requirement

Images