共查询到19条相似文献,搜索用时 78 毫秒
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总结了飞秒脉冲激光烧蚀金属的研究进展,经过烧蚀后的表面形成了几种结构,包括随机分布的微纳米结构、激光诱导的周期表面结构、激光扫描的周期结构和孔阵列结构,阐述了金属表面结构化后独特的光谱吸收增强特性,最后展望了其潜在应用. 相似文献
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采用1kHz飞秒激光(脉宽148fs,中心波长775nm)对石英衬底的金膜的烧蚀过程进行了研究.单脉冲与多脉冲的烧蚀阈值可以通过烧蚀点的直径平方与所用的激光能流的关系曲线获得.通过累积能流和烧蚀脉冲数的关系,可以得到金膜的脉冲累积因子.采用飞秒激光加工材料的一些特点可以合理解释单脉冲阈值附近获得的一些实验现象. 相似文献
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双光子吸收几率与光强度的平方成正比,因此,双光子吸收引发光致聚合局限在紧密聚焦的焦点区域,通过控制焦点的扫描运动可实现高精度三维加工。基于该原理,提出了一种利用飞秒激光进行微细加工的技术。根据此技术,建立了飞秒激光三维微细加工系统,该系统包括光源系统、显微镜系统、实时监测系统和精密移动系统等。研究发现,该系统加工的直线线宽最小可达500nm;加工线宽与加工速度成反比;激光功率为2mW时,最大和最小临界加工速度分别为80μm/s和1μm/s;制备出线宽1μm,宽度5μm的“CHINA”复杂结构,以及杆间距、层间距均为5μm的三维木堆型光子晶体结构。实验证实,该技术是一种非常灵活的微细加工技术。 相似文献
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飞秒激光空间选择性诱导玻璃微结构及应用 总被引:1,自引:0,他引:1
利用飞秒激光与玻璃的非线性相互作用,可以对玻璃进行空间选择性微观改性与修饰,赋予新的光功能.本文介绍飞秒激光的持点及其对玻璃微结构的改性,以及近年来利用飞秒激光进行玻璃的缺陷控制、光活性离子(稀土、过渡和重金属离子)价态操作、微晶析出与折射率调控及其在光开关、波分复用、波导型有源器件、光子晶体等微光学器件的制备及光学集成领域应用的进展. 相似文献
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强光致磷酸盐激光玻璃的色心及其ESR研究 总被引:1,自引:0,他引:1
研究了磷酸盐激光玻璃在120fs,800nm,1kHz脉冲激光照射下的光致暗化现象并测出了它们的光致暗化阈值。由ESR分析得出,磷酸盐玻璃的光致暗化来源于飞秒激光照射处玻璃因激光照射时的多光子吸收 生的色心。分析了Nd^3 对磷酸盐玻璃的光致暗化的影响并讨论了色心的类型。 相似文献
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Yasuko Motoyashiki Angelika Brückner-Foit Lars Englert Lars Haag Matthias Wollenhaupt Thomas Baumert 《International Journal of Fracture》2006,139(3-4):561-568
Since small crack propagation behavior is strongly affected by microstructure, very small artificial notches with a length
in the submillimeter range are needed for a systematic study of microcrack behavior. Laser processing technique with ultrashort
pulses is a micromachining tool which will not cause any serious mechanical damage in metallic materials. Small artificial
starter notches were manufactured in medium carbon steels with this technique and some fatigue tests were carried out. Laser
affected zones could be observed at the notch boundary but cracks were initiated from the notch tips and propagated steadily.
The crack paths were very tortuous like natural small cracks. The experimental results showed that the femtosecond laser processing
technique is useful to introduce a small notch and allows systematic investigation of microcrack behavior. 相似文献
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使用振荡器产生的飞秒激光在透明有机材料PMMA表面进行了刻划微结构光栅的研究.通过理论分析得到了飞秒激光参数和平台移动速度对线宽的影响,进行了系统的加工实验,加工结果与理论分析基本吻合.在透明有机材料PMMA表面进行了多种光栅的刻划,并对刻划的光栅进行了衍射和色散测试,调整光栅的尺寸和排列方式,得到了形状各异的衍射图案。 相似文献
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飞秒激光烧蚀材料表面产生纳米波纹结构的实验 总被引:2,自引:1,他引:1
利用飞秒脉冲激光烧蚀可以获得远小于激光中心波长(775nm)量级的周期条纹.通过多脉冲飞秒激光烧蚀Ni、Al、Cu、Ti和Si等材料表面的实验,得到材料表面产生光栅的周期均小于飞秒激光中心波长;采用对比实验,改变入射光的偏振特性,发现波纹周期方向随入射光偏振方向的改变而改变;不改变激光偏振态、脉冲能量为4.2J/cm^2时,沿波纹周期走向,发现平台移动速度为0.1mm/s时,可获得清晰的551nm的金属周期结构;最后应用上述实验结果,在铜片表面制备了长为几十微米、周期为551nm的微纳光栅结构。 相似文献
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Zhenkai Zhu Peichao Wu Saulius Juodkazis Ji Wang Songbai Yao Jianhua Yao Wenwu Zhang 《Advanced Engineering Materials》2023,25(20):2300575
Glass fiber-reinforced polymer (GFRP) is formed with glass fiber as the reinforcing material and resin as the matrix. It is widely used in wind turbine blades because of its lightweight, high strength, and corrosion resistance properties. Herein, a method to prepare superhydrophobic GFRP surfaces by femtosecond laser direct writing combined with fluoroalkylsilane modification is demonstrated. The prepared GFRP surface has excellent superhydrophobicity with contact angle of 163.9° and sliding angle of 3.8°. In the ice resistance tests, the icing delay time is extended from 33 to 273 s at −5 °C. The ice adhesion strength is reduced from 217.4 to 40.3 kPa. The surface still has superhydrophobicity and ice adhesion strength of less than 100 kPa after ten cycles of the test. The laser exposure conditions are optimized for water/ice repelling and are at high intensity of 4 TW cm−2 pulse−1 and 2.5 m s−1 beam travel speed, which make the presented approach efficient for fabrication over industrially large areas. 相似文献