Compression ultrafast imaging type arbitrary reflecting surface speed interferometer

Abstract

The invention discloses a compression ultrafast imaging type arbitrary reflecting surface speed interferometer, which is composed of a light source and target system, an etalon interference system, acompression ultrafast imaging system, a sequential control system and a data processing system. According to the invention, the compression ultrafast imaging system is adopted to replace an imaging device in a traditional imaging type arbitrary reflecting surface speed interferometer, a Compression Ultrafast Imaging (CUP) technology is introduced in an imaging process, multi-frame images, namely two-dimensional space and one-dimensional time three-dimensional imaging, can be reconstructed through CUP-VISAR two-dimensional ultrafast dynamic image imaging and single measurement, and the completedynamic process of a two-dimensional interference fringe image is restored, so that shock wave space-time evolution information is effectively obtained; and the imaging performance of an imaging typearbitrary reflecting surface speed interferometer is improved in dimension, and the target which cannot be achieved before is achieved.

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...

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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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