Research on Deterioration Mechanism of Dynamic Spatial Resolution of Picosecond Gated Image Intensifier

HU Shiyu; YANG Yang; GOU Yongsheng; XU Yan; FENG Penghui; YAO Jiahui; FENG Zhiyu; WANG Bo; LIU Baiyu; TIAN Jinshou

doi:10.3788/gzxb20265508.0823002

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Research on Deterioration Mechanism of Dynamic Spatial Resolution of Picosecond Gated Image Intensifier

更新时间：2026-07-15

- Research on Deterioration Mechanism of Dynamic Spatial Resolution of Picosecond Gated Image Intensifier
- Acta Photonica Sinica Pages: 1-12(2026)
- 作者机构：
  
  1.中国科学院西安光学精密机械研究所超快光科学与技术全国重点实验室，西安 710119
  2.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(12505246);National Key Research and Development Program of China(2024YFF0726202);West Light Foundation, Chinese Academy of Sciences(XAB2022YN12)
- DOI：10.3788/gzxb20265508.0823002
  CLC： O462
- CSTR：32255.14.gzxb20265508.0823002
- Received：07 April 2026，
  
  Revised：2026-04-17，
  
  Accepted：05 June 2026，
- 稿件说明：
移动端阅览
HU Shiyu, YANG Yang, GOU Yongsheng, et al. Research on Deterioration Mechanism of Dynamic Spatial Resolution of Picosecond Gated Image Intensifier[J/OL]. Acta Photonica Sinica, 2026, gz26-0151
DOI：

HU Shiyu, YANG Yang, GOU Yongsheng, et al. Research on Deterioration Mechanism of Dynamic Spatial Resolution of Picosecond Gated Image Intensifier[J/OL]. Acta Photonica Sinica, 2026, gz26-0151 DOI： 10.3788/gzxb20265508.0823002. CSTR： 32255.14.gzxb20265508.0823002.

摘要

像增强器在皮秒门控工作模式下空间分辨率的显著劣化，严重制约其在超快诊断中的成像效果。针对这一问题，研究了阴极有效电压对成像质量的影响。结合有限元电磁仿真与胞中粒子求解法，建立了门控脉冲传输模型及像管内部电子渡越模型。仿真表明，阴极面电阻引起的欧姆损耗与阻抗失配导致的反射畸变，会使第一近贴区阴极有效电压发生动态退化，进而放大光电子横向弥散，造成空间分辨能力劣化。利用飞秒激光搭建动态时空分辨测试平台进行实验验证，测得像增强器静态空间分辨率为32 lp/mm（对比传递函数为11.72%）；而在曝光时间315 ps的动态工作状态下，动态空间分辨率下降至16 lp/mm（对比传递函数为11.28%）。随着第一近贴区有效电压从-25 V降低至-5 V，动态空间分辨率进一步下降甚至无法分辨，曝光时间相应从315 ps缩短至263 ps，实验结果与仿真规律高度一致。本文阐明了皮秒门控下像增强器空间分辨劣化的核心物理机制，为优化其动态工作性能提供了关键理论支撑。

Abstract

Precisely capturing ultrafast transient processes is crucial in extreme physics experiments such as inertial confinement fusion and high-energy plasma diagnostics. Although temporal resolutions is the key performance metrics for proximity-focused image intensifiers， the dynamic spatial resolution under picosecond gating conditions suffers significant degradation. Current theoretical models often rely on first-order approximations， lacking accurate multidimensional descriptions of the nonlinear pulse distortions caused by impedance mismatch and photocathode sheet resistance. Therefore， this paper investigates the spatial variation of the effective voltage on the photocathode under picosecond gating and reveals its physical impact mechanism on dynamic spatial resolution. By establishing a physical model that can reflect the actual complex tube structure， this study clarifies how an insufficient effective driving voltage increases the spatial dispersion of electrons， providing critical theoretical support for optimizing ultrafast imaging devices.A comprehensive methodology organically combining 3D electromagnetic simulation， particle dynamics calculations， and high-precision optical experiments was employed. A microwave transmission model of the photocathode waveguide was built in CST software to simulate the radial propagation of a 200 ps FWHM negative Gaussian pulse， quantifying the severe temporal and spatial voltage attenuation induced by ohmic loss. Subsequently， an M-C method based PIC electron transit model utilizing the precise Furman secondary emission model was established to evaluate the mapping relationship between the effective voltage across the photocathode-MCP gap and the MTF. To verify the simulation model， an experimental platform featuring a 515 nm， 220 fs ultrafast femtosecond laser and was constructed. By actively varying the positive bias applied to the photocathode from 10 V to 30 V， the effective voltage equivalently reduced from -25 V to -5 V， the dynamic spatial resolution was experimentally and quantitatively tested using a standard USAF 1951 resolution target.Simulation results demonstrates that the limited conductivity of the photocathode sheet resistance induces severe RC delay and edge reflection effects， ultimately causing a drastic dynamic degradation of the effective electric field in the first proximity zone. Furthermore， the particle dynamics simulation reveals a piecewise modulation effect： in the high-contrast imaging range （MTF20%）， the spatial resolution strictly and monotonically decreases as the effective voltage drops， primarily due to the weakened suppression of initial transverse kinetic energy and intensified space charge effects. These experimental results are highly consistent with the simulated predictions. Under a static continuous-working state， the maximum spatial resolution of the intensifier reaches 32 lp/mm@CTF=11.72%. However， under dynamic picosecond gating at a -25 V effective voltage， the resolution noticeably degrades to 16 lp/mm@CTF=11.28% and the optical exposure time is 315 ps. As the positive bias progressively increases， effectively reducing the internal accelerating voltage， resulting in the image becoming more and more blurred and the line pairs are completely merged and indistinguishable.The intrinsic sheet resistance and the structural impedance mismatch of the photocathode are the primary impacts causing severe dynamic degradation of the effective electric field during the inward radial propagation of ultrafast gating pulses. This dynamically weakened accelerating field prolongs the electron transition time within the vacuum proximity gap and amplifies the transverse dispersion of photoelectrons representing the fundamental physical mechanism responsible for the drastic deterioration of dynamic spatial resolution in picosecond gated image intensifiers. To successfully maintain excellent spatial resolution capabilities in ultrafast gating regimes， future optimization and development of gated image intensifiers can focus heavily on improving the photocathode waveguide structure to minimize microwave transmission loss， employing advanced micro-nano manufacturing techniques to lower the intrinsic sheet resistance， or introducing electromagnetic compound focusing mechanisms. Utilizing pulsed strong magnetic fields to externally constrain the electron transit dispersion process will be absolutely critical to overcoming the current physical bottlenecks in picosecond gated high speed imaging systems.

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