Dr. Tianyu Zhang Profile

Dr. Tianyu Zhang

at Shanghai Institute of Optics & Fine Mechanics CAS

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Proceedings Article | 15 December 2022 Paper

Target synchronous measurement based on refractive index change imaging

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

Proceedings Volume 12478, 124784F (2022) https://doi.org/10.1117/12.2654953

KEYWORDS: Refractive index, Diagnostics, Ultrafast phenomena, Kerr effect, Charge-coupled devices, Time metrology, Signal detection, Plasma, Picosecond phenomena, Oscilloscopes

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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.

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