A Squeezed Ultrafast Velocity Interferometer for Imaging Arbitrary Reflecting Surfaces

Abstract

The invention discloses a compressed ultrafast imaging type arbitrary reflective surface velocity interferometer, which is composed of a light source and a target target system, an etalon interference system, a compressed ultrafast imaging system, a timing control system and a data processing system; A compressed ultrafast imaging system is used to replace the imaging device in the traditional imaging type arbitrary reflecting surface velocity interferometer, and the compressed ultrafast imaging technology (Compressed Ultrafast Photography, CUP) is introduced in the imaging process. , through a single measurement, multiple frames of images can be reconstructed, that is, the three-dimensional imaging of two-dimensional space and one-dimensional time, the complete dynamic process of the two-dimensional interference fringe image can be restored, and the temporal and spatial evolution information of the shock wave can be effectively obtained. The imaging performance of the reflective surface velocity interferometer has been improved dimensionally, reaching the goal that could not be achieved before.

Description

technical field [0001] The invention relates to the technical field of optical recording velocity interferometers, in particular to a compressive ultrafast imaging type arbitrary reflective surface velocity interferometer. Background technique [0002] In the research of laser inertial confinement fusion (ICF), the techniques for diagnosing shock wave velocity mainly include passive shock wave diagnosis technology and active shock wave diagnosis technology. Among them, the passive shock wave diagnosis technology detects the fluorescence generated when the shock wave breaks through the sample interface, and obtains the average speed of transition between steps through the step target design. It is a simple and direct diagnosis technology with limited application occasions. The active shock wave diagnosis technology actively inputs a beam of probe light, and obtains the velocity history of the surface to be tested based on the principle of Doppler frequency shift through the b...

AI Technical Summary

Problems solved by technology

However, this method still has certain limitations. It can only detect the shape of the shock wave velocity field at a certain time point, that is, to obtain a single frame of image, and it cannot be observed in real time, resulting in a large amount of information loss, and it is difficult to restore the complete dynamic process of the interference fringes. , which cannot satisfy the detection of laser ICF

[0004] Because the traditional imaging-type arbitrary reflective surface velocity interferometer is affected by the imaging device, when the receiving device is an area array CCD, only one frame of two-dimensional images can be formed in a single measurement; or the receiving device is a streak camera, and only one frame can be formed in a single measurement. Multi-frame one-dimensional images, but target shooting is a transient change process, the time is very short, it can only be measured once, and repeated measurements cannot be repeated

Therefore, no matter whether one frame of two-dimensional image or multiple frames of one-dimensional image is obtained, due to the limited information obtained, it is impossible to deduce the entire change process of the transient process when laser inertial confinement fusion implodes under the action of strong laser light. It is not conducive to the corresponding pulse shaping of the strong laser used for targeting, which restricts the improvement of targeting efficiency

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