Target synchronous measurement based on refractive index change imaging

Tianyu Zhang; Yingming Xu; Mingying Sun; Wei Fan; Jianqiang Zhu

doi:10.1117/12.2654953

15 December 2022 Target synchronous measurement based on refractive index change imaging

Tianyu Zhang, Yingming Xu, Mingying Sun, Wei Fan, Jianqiang Zhu

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 124784F (2022) https://doi.org/10.1117/12.2654953
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

Laser inertial confinement fusion (ICF) experiment puts forward high requirements on the energy, power balance and waveform consistency of the multiple pulses reaching the target. The uniform drive of the target surface requires precise beam synchronization to achieve accurate power balance, so the synchronization test and adjustment technology for multiple lasers is particularly important. In order to realize the time synchronization measurement of multiple beams directly at the target point, a target point synchronization measurement scheme based on optical Kerr medium refractive index change imaging was proposed. The optical Kerr effect occurs when ultrashort pulses with high power density pass through the optical Kerr medium, and a refractive index change occurs inside the optical Kerr medium. Since the refractive index of the area where the focused laser passes is different from the surrounding refractive index, if the diagnostic light can pass through the area where the refractive index changes within the time when the optical Kerr effect occurs, the image of the refractive index change can be displayed on the CCD. Pulse synchronization measurements can be achieved by monitoring the state of refractive index changes. The delay between the diagnostic light and the focused laser is determined by the presence or absence of refractive index changes on the CCD.The final experimental result showed that the synchronization accuracy was better than 2.5ps. In addition, the energy analysis of the pump light was carried out.

Citation Download Citation

Tianyu Zhang, Yingming Xu, Mingying Sun, Wei Fan, and Jianqiang Zhu "Target synchronous measurement based on refractive index change imaging", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 124784F (15 December 2022); https://doi.org/10.1117/12.2654953

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KEYWORDS

Refractive index

Diagnostics

Kerr effect

Ultrafast phenomena

Charge-coupled devices

Oscilloscopes

Picosecond phenomena

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