单镜头8帧直接成像,有效帧率高达40 Tfps,二维空间带宽积超过65500。

IF 3.3 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2025-09-08 DOI:10.1364/OE.569272
Congying Wang, Rui Zhang, Xuanke Zeng, Yi Cai, Xiaowei Lu, Ran Ning, Hongmei Zhong, Kaipeng Wu, Shixiang Xu, Jingzhen Li, Dianyuan Fan
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引用次数: 0

摘要

与计算成像相比,直接成像能够提供更直观、更可靠的目标时空信息,仍然是一个值得关注的问题。本文提出了一种基于非共线光学参量放大(OPA)偏振空间编码的单镜头超快分幅直接成像方法,具有良好的成像种子和时空分辨率。本文设计了8个光参量放大器的2 × 4结构,通过偏振分裂得到8帧。这种结构有效地抑制了信号去极化和衍射效应,特别是减轻了泵浦传播过程中的非线性效应,从而提高了与1 × 8设计相比的成像质量。以激光诱导的空气等离子体为目标,我们的实验验证了单次成像系统可以在10 × 10 mm2的视场范围内以25 fs的时间分辨率、40万亿帧/秒(Tfps)的有效帧速率和超过25.6 lp/mm的空间分辨率进行8帧直接成像。实验结果还表明,在激发后的早期阶段(0 ~ 3.6 ps),捕获了更丰富的空气等离子体时空细节。通过改变帧间隔,可以灵活地扩展时间窗口。这项工作为准确理解飞秒到皮秒尺度的非重复或随机动态场景的动态过程提供了有力的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Single-shot 8-frame direct imaging with an effective frame rate up to 40 Tfps and a two-dimensional space-bandwidth-product beyond 65,500.

Compared with computational imaging, direct imaging is still a concern since it provides more intuitive and reliable spatiotemporal information of the target. The paper presents a single-shot ultrafast framing direct imaging based on polarization-spatial-encoding via non-collinear optical parametric amplification (OPA) with remarkable imaging seed and spatiotemporal resolutions. Here, a 2 × 4 architecture is designed for eight optical parametric amplifiers to get eight frames by polarization splitting. This architecture effectively suppresses signal depolarization and diffraction effects, particularly mitigating nonlinear effects during pump propagation, thus enhancing imaging quality compared with a 1 × 8 design. Targeted with laser-induced air plasma, our experiments verify that the single-shot imaging system has carried out 8-frame direct imaging by 25 fs temporal resolution, 40 trillion frames per second (Tfps) effective frame rate, and beyond 25.6 lp/mm spatial resolution over a 10 × 10 mm2 field-of-view. The experimental results also show the capture of richer spatiotemporal details of air plasma in the early stage (0∼3.6 ps) after excitation. The temporal window can be flexibly expanded by changing the frame interval. This work provides a powerful tool for accurately understanding dynamic processes on the femtosecond to picosecond scale for non-repeatable or random dynamic scenarios.

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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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