Prof. Wei Zhao Profile

Prof. Wei Zhao

at XIOPM CAS

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Publications (2)

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Proceedings Article | 18 March 2024 Paper

Fabrication of large aspect ratio single crystal diamond microchannel by femtosecond laser

Ning Wang, Jingzhou Zhang, Hualong Zhao, Wei Zhao

Proceedings Volume 13104, 131040B (2024) https://doi.org/10.1117/12.3016198

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As heat dispersing materials, Diamond has high thermal conductivity, extremely low coefficient of thermal expansion, low coefficient of friction, and good chemical stability, which have broad application prospects in the field of high-power device heat dissipation. This study aims to address the inability of traditional laser processing methods to meet the processing requirements of high aspect ratio diamond heat dissipation microchannels. Based on a femtosecond laser fiveaxis machining system, a five-axis attitude alternating machining method is used to study the forming size, surface roughness, and aspect ratio of femtosecond laser surface microchannels, and to compare it with the direct machining method using a galvanometer. The experimental results show that using a super depth of field optical microscope for detection, the cross-sectional shape of diamond microchannels processed using a galvanometer direct machining method is triangular, with an edge unilateral taper of 62°. The cross-sectional shape of diamond microchannels processed using a five axis attitude alternating machining method is ladder shaped, with a maximum edge unilateral taper of 88°, approaching a vertical state of 90°. As the width of microchannels increases, the unilateral taper value increases. By using a confocal microscope, the roughness of diamond microchannels processed using a galvanometer direct machining method is Ra0.88, and the optimal roughness of diamond microchannels processed using a five axis attitude alternating machining method is Ra0.29. The use of five-axis attitude alternating machining method is superior to the use of galvanometer direct machining in terms of unilateral taper and roughness. Finally, diamond rectangular microchannels were prepared using a five axis attitude alternating machining method, with a maximum aspect ratio of 10.7:1 and a maximum depth of 1.072mm.

Proceedings Article | 25 April 2022 Paper

Research on precise synchronous high voltage pulse gating system of framing camera

ZhiKun Yang, YouSheng Gou, JinShou Tian, Wei Zhao, Yang Yang, PengHui Feng, Xv Wang, ShiDuo Wei, HanTao Xv, BaiYu Liu, Zhen Chen

Proceedings Volume 12244, 122440V (2022) https://doi.org/10.1117/12.2635206

KEYWORDS: Signal processing, Cameras, Imaging systems, Pulse generators, Oscilloscopes, System integration, Distortion, Digital electronics, Capacitance, Transistors

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In this paper, a special high-voltage pulse synchronization system is designed for the framing camera used in the Z-pinch experiment.The system adopts a system architecture that combines a programmable delay module and a high-voltage pulse generation module. The delay module uses a digital delay chip to achieve picosecond delay. The high-voltage pulse generation module uses a Marx pulse circuit combined in series and parallel to generate high-voltage narrow pulse.Technical parameters: pulse amplitude 2.5kv, pulse width 4.03ns, delay range 2s, delay accuracy 500Ps, pulse jitter less than 150ps. It avoids the line loss and waveform distortion caused by the long transmission line of the traditional delay line method, improves the system integration, reduces the volume and weight of the equipment, and is more convenient to deploy and use.

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