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Picosecond Laser Machining of deep holes in Silicon Infiltrated Silicon Carbide Ceramics

Journal of Wuhan University of Technology(Materials Science) 2015年第3期30卷 437-441页

作者：张青 WANG Chunhui LIU Yongsheng ZHANG Litong CHENG Guanghua Science and Technology on Thermostructure Composite Materials Laboratory Northwestern Polytechnical University State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences

Silicon infiltrated silicon carbide （Si-SiC） ceramics, as high hardness materials, are difficult to machine, especially drilling micro-holes. In this study, the interaction of picosecond laser pulses （1 ps at 1 030 nm） with Si-SiC ceramics was investigated. Variations of the diameter and depth of circular holes with the growth of the laser energy density were obtained. The results indicate that the increase of machining depth follows a nonlinear relation with the increasing of laser energy density, while the diameter has little change with that. Moreover, it is found that some debris and particles are deposited around and inside the holes and waviness is in the entrance and at walls of the holes after laser processing.

关键词： picosecond laser deep holes silicon infiltrated silicon carbide ceramic

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Construction and Weight Distributions of Binary Linear Codes Based on deep holes

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Applied Mathematics 2023年第10期14卷 684-695页

作者： Yong Yang Wenwei Qiu School of Mathematics and Information China West Normal University Nanchong China

deep holes are very important in the decoding of generalized RS codes, and deep holes of RS codes have been widely studied, but there are few works on constructing general linear codes based on deep holes. Therefore, we consider constructing binary linear codes by combining deep holes with binary BCH codes. In this article, we consider the 2-error-correcting binary primitive BCH codes and the extended codes to construct new binary linear codes by combining them with deep holes, respectively. Furthermore, three classes of binary linear codes are constructed, and then we determine the parameters and the weight distributions of these new binary linear codes.

关键词： Linear Codes MacWilliams Equations Weight Distribution Dual Codes deep holes Covering Radius

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