Mr. Zhou Qu Profile

Zhou Qu

at College of Optical And Electronical Information

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Proceedings Article | 12 December 2018 Paper

The key technology on high power fiber optic laser in laser weapon

Zhou Qu, Qiushi Li

Proceedings Volume 10844, 108440T (2018) https://doi.org/10.1117/12.2505490

KEYWORDS: Fiber lasers, Optical fibers, Fiber optics, Laser applications, Laser optics, Laser missile defense, Cladding, Weapons, Semiconductor lasers, Defense technologies

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The soft-killing laser weapon plays an important role in photoelectric defense technology. It can be used for photoelectric detection，search，blinding of photoelectric sensor and other devices on fire control and guidance devices, therefore it draws more and more attentions by many scholars. High power fiber-optic laser has many virtues such as small volume, simple structure, nimble handling, high efficiency, qualified light beam, easy thermal management, leading to blinding. Consequently, it may be used as the key device of soft-killing laser weapon. The present study introduced the development of high power fiber–optic laser and its main features. Meanwhile the key technology of large mode area(LMA) optical fiber design , the beam combination technology, double-clad fiber technology and pumping optical coupling technology was stated. The present study is aimed to design high doping LMA fiber, ensure single mode output by increasing core diameter and decrease NA. By means of reducing the spontaneous emission particle absorbed by fiber core and Increasing the power density in the optical fiber, the threshold power of nonlinear effect can increase, and the power of single fiber will be improved. Meantime, high power will be obtained by the beam combination technology. Application prospect of high power fiber laser in photoelectric defense technology was also set forth. Lastly, the present study explored the advantages of high power fiber laser in photoelectric defense technology.

Proceedings Article | 12 December 2018 Paper

Micro-CT evaluation of fit of CAD/CAM occlusal veneers with Er:YAG laser treatment on dentin

Qiushi Li, Zhou Qu, Xi Si, Meihua Li

Proceedings Volume 10844, 108440L (2018) https://doi.org/10.1117/12.2505193

KEYWORDS: Laser therapeutics, Teeth, Computer aided design, Er:YAG lasers, Computed tomography, Manufacturing, Ceramics, Statistical analysis, X-ray computed tomography

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This study was aimed to demonstrate whether laser treatment on dentin is effective to improve the marginal and internal fit of CAD/CAM occlusal veneers, which is a conservative restoration for severe tooth defect from abrasion. Sixteen extracted molars were divided into 4 groups according to adopting laser treatment on dentin and milling materials (n=4): Lava Ultimate CAD/CAM Restorative with no laser treatment on dentin (group LU-C), Lava Ultimate CAD/CAM Restorative with laser treatment on dentin(group LU-L), IPS Empress CAD with no laser treatment on dentin(group IE-C) and IPS Empress CAD with laser treatment on dentin(group IE-L). After the restoration adhesion, all of specimens were scanned by micro-computed tomography(micro CT) to evaluate the marginal and internal fit of each specimen by artificial setting measuring points from both bucco-palatal and mesio-distal direction. For marginal fit, there was no statistical difference with or without laser treatment on dentin for either milling material. For internal fit, the situation was identical. Laser treatment on dentin would not affect the marginal or internal fit of CAD/CAM occlusal veneers, therefore, it may not be necessary for improving the fit of restorations.

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