A diagnostic system toward high-resolution measurement of wavefront profile

Yang, Yuehong; Li, Yulong; Guan, Zanyang; Yang, Chengshuai; Zhang, Shian; Wang, Feng; Li, Tingshuai

doi:10.1016/j.optcom.2019.124554

Cited by 9 publications

(1 citation statement)

References 18 publications

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“…Among them, the compressed ultrafast photography (CUP) [15] system that combines CS and ultrafast photography can capture the ultrafast dynamical scene. Considering its great advantages in ultrafast two-dimensional photography, we have designed a brand new 2D-VISAR by combining the current line-VISAR with the CUP system, called the CUP-VISAR [16]. Utilizing this technology, we can obtain the two-dimensional velocity field of shockwave front evolution with time so as to establish the quasi-continuous diagnosis ability of two-dimensional wavefront, which provides a solution for the study of the generation and growth mechanism of hydrodynamic instability seeds in ICF process.…”

Section: Introductionmentioning

confidence: 99%

Study on the length of diagnostic time window of CUP-VISAR

Guan¹,

Li²,

Wang³

et al. 2021

Meas. Sci. Technol.

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One-dimensional line velocity interferometer system for any reflectors (VISARs) acts as a significant diagnostic device in the process of the inertial confinement fusion, which can be used to measure the free surface velocity and the history of shockwave velocity in transparent media over time. But the lack of spatial information makes it impossible to measure the flatness of wavefront. The compressed ultrafast photography (CUP) system developed in recent years can realize two-dimensional ultrafast photography. We have designed a new two-dimensional VISAR diagnosis system by combining the CUP with line-VISAR, called the CUP-VISAR, which will be of great significance in two-dimensional shockwave front measurement. In this paper, a data simulation method of CUP-VISAR is proposed to study the length of diagnostic time window of the device. A series of original VIASR images are firstly generated and then the compressed images are simulated after image encoding and compression. Finally, two-step iterative shrinkage thresholding algorithm is used to reconstruct the compressed images, which results in corresponding reconstructed images. In order to verify the restoration effect of the algorithm, we calculate the velocity error and image correlation coefficient value. Finally the relationship between the image reconstruction quality and the number of images is preliminarily obtained, which provides reference for the actual experiment.

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Section: Introductionmentioning

confidence: 99%

Study on the length of diagnostic time window of CUP-VISAR

Guan¹,

Li²,

Wang³

et al. 2021

Meas. Sci. Technol.

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A compact flexible sub-nanosecond framing photographic system

Li,

Yuan,

et al. 2023

Review of Scientific Instruments

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A novel high-speed multi-frame photographic system is presented in this paper. The system demonstrates exceptional compactness and flexibility, requiring only the introduction of a cavity comprising multiple beam-splitters in the optical path to enable multi-frame imaging of sub-nanosecond events. The number and temporal delay of frames can be easily adjusted by adjusting the distance and angle between beam-splitters. These capabilities are demonstrated by observing the laser ablation process, highlighting the great potential for application in capturing ultrafast time-evolving events such as optical breakdown, the evolution of laser-produced plasmas, and the propagation of shock waves.

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Tutorial on compressed ultrafast photography

Lai,

Marquez,

Liang

2024

J. Biomed. Opt.

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. Significance Compressed ultrafast photography (CUP) is currently the world’s fastest single-shot imaging technique. Through the integration of compressed sensing and streak imaging, CUP can capture a transient event in a single camera exposure with imaging speeds from thousands to trillions of frames per second, at micrometer-level spatial resolutions, and in broad sensing spectral ranges. Aim This tutorial aims to provide a comprehensive review of CUP in its fundamental methods, system implementations, biomedical applications, and prospect. Approach A step-by-step guideline to CUP’s forward model and representative image reconstruction algorithms is presented with sample codes and illustrations in Matlab and Python. Then, CUP’s hardware implementation is described with a focus on the representative techniques, advantages, and limitations of the three key components—the spatial encoder, the temporal shearing unit, and the two-dimensional sensor. Furthermore, four representative biomedical applications enabled by CUP are discussed, followed by the prospect of CUP’s technical advancement. Conclusions CUP has emerged as a state-of-the-art ultrafast imaging technology. Its advanced imaging ability and versatility contribute to unprecedented observations and new applications in biomedicine. CUP holds great promise in improving technical specifications and facilitating the investigation of biomedical processes.

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A diagnostic system toward high-resolution measurement of wavefront profile

Cited by 9 publications

References 18 publications

Study on the length of diagnostic time window of CUP-VISAR

Study on the length of diagnostic time window of CUP-VISAR

A compact flexible sub-nanosecond framing photographic system

Tutorial on compressed ultrafast photography

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