共查询到19条相似文献,搜索用时 125 毫秒
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全息激光防护薄膜的研制 总被引:2,自引:0,他引:2
介绍了全息激光防护薄膜基本理论和设计方法。研制成功的全息激光防护薄膜,其光学性能测试表明:0.53μm波长激光的光密度D达4.11,防护角达15°,具有良好的可见光透过率,且抗激光破坏能力强,可用于人眼和光电探测系统的激光防护。 相似文献
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卫星激光防护技术研究 总被引:7,自引:0,他引:7
从3个方面探讨了卫星的激光防护技术。介绍了材料与光电传感器的抗激光攻击能力的试验评价方法;给出了卫星光电传感器的抗激光致盲薄膜的设计原理;阐述了结构材料的激光损伤机理并说明了结构材料的激光防护技术。 相似文献
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轻量化合金材料的耐高温、抗烧蚀性能较差,采用激光熔覆技术制作涂层的方法可提升其热防护性能。本文从热防护的机理出发,结合激光熔覆工艺对熔覆材料性能的要求,从现有的热防护材料和激光熔覆材料中筛选出几种可实现短时间、无冷却情况下基体热防护的熔覆材料,并对基于激光熔覆工艺的热防护材料的未来发展趋势进行了展望。 相似文献
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单晶硅材料的1064nm Nd:YAG脉冲激光损伤特性研究 总被引:2,自引:0,他引:2
作为微电子和光电子系统中普遍使用的一种结构材料,单晶硅一直是人们研究的焦点.长期以来,人们对其电学性质进行了非常深入细致的研究,却疏于对其抗击强激光辐照特性的研究.随着激光通讯和光电对抗技术的发展,对光学材料的激光破坏特性和加固技术进行研究的需求也显得越来越迫切.本文主要对单晶硅的抗激光损伤特性进行研究,研究了单晶硅材料在1064nm Nd:YAG激光自由脉冲输出模式和单脉冲输出模式作用下的损伤特性,通过对两种激光作用下单晶硅损伤形貌的分析,在热效应与热力耦合模型的基础上,对单晶硅的激光损伤机制进行了探索. 相似文献
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《中国材料进展》2017,(2)
激光器因其自身的特点得到了长足的发展和广泛的应用,相应的,随着激光的军事化应用所产生的激光威胁必须得到妥善解决,为了保护装备及其基体不受激光损伤和破坏,激光防护必不可少。而现阶段,对于大功率连续激光而言,其对材料的破坏形式主要是热破坏,表现为被辐照材料温度达到一定临界点后,以氧化、熔融、气化的形式发生不可逆的损耗,所以为了保证装备及其基体不发生上述破坏,采用一定的方式消耗入射激光能量,进而减小激光热量转化和沉积使得温度降低到材料损伤阈值以下,是可行的方式之一。因此,基于上述机制选用了一种常见的焓变涂料CaCO_3作为研究对象,探究了其激光烧蚀行为和防护能力。研究结果表明,CaCO_3涂层明显降低了基体材料在激光辐照下的温度,实现了入射激光能量的有效耗散。并经初步计算,单位面积(1 cm~2)涂层可耗散0.473 kJ的能量,可降低45钢基体温度约53℃。 相似文献
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通过对目前激光防护技术实现手段的分析,针对目前1064nm激光防护材料中存在的问题,阐述了研制新型1064nm激光防护染料的重要性和紧迫性。在此基础上,综述了克酮酸菁近红外吸收染料的研究进展,着重强调了作为1064nm激光防护染料必须具备的技术特征。结合国内外研究现状,指出宜采用克酮酸和相对稳定的生色团作为构筑1064nm激光防护染料的基本骨架单元,并通过对分子结构的优化设计和理论计算分析,积极开展1064nm新型近红外激光防护染料的合成、结构与性能等应用基础研究。 相似文献
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HfO2/SiO2 and Al2O3/SiO2 multilayers to be employed as high reflectance end mirrors in Cerium-doped fluoride solid-state lasers were produced by radio frequency sputtering. The components were designed to have high transmittance at the pumping wavelength and high reflectance in a wavelength band corresponding to the active medium emission. A photoacoustic beam deflection technique and inspection of the irradiated area under a microscope were used to measure the laser induced damage threshold of the mirrors at the pumping wavelength. These coatings were tested in a laser cavity. 相似文献
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采用紫外激光对触摸屏产品中不可视区域进行刻蚀分析,探究了紫外激光刻蚀原理,讨论了银浆薄膜激光刻蚀与传统印刷工艺异同点,并在此基础上完成一套紫外激光刻蚀系统方案的设计和建造。实验结果表明,选用波长为355nm的紫外激光器,当激光器功率为10W,重复频率100kHz,刻蚀速度为1500mm/s,刻蚀次数1次时,薄膜被完全刻蚀,最终获得功能良好的银浆线路。经测试后发现,所刻蚀后银浆线条平直而光滑,边缘热影响区域较小,最小刻蚀线宽可以达到10μm,基板未受到损伤;与传统印刷工艺相比较,简化了工艺步骤,产品良品率得到提升,是一种无排放的绿色环保先进的刻蚀工艺。 相似文献
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This paper addresses chemical alteration of titanium using pulsed Ytterbium fiber laser irradiation. For this study, Hydrogen Peroxide (HP) is used as the medium to study its effect on increasing anatase-titania composition in titanium substrates for samples irradiated by the laser. The variation of anatasei-rutile transformation generated in HP is compared with those generated in air. X-Ray diffraction (XRD) analysis suggests that three titanium dioxide structures - brookite, anatiase, and rutile - are present in the substrates irradiated by the laser beam. Additional peaks appeared in XRD results of HP immersed samples indicating that anatase and a rare titanium oxide structure, Hongquiite, are also produced, whereas these oxides are not detected in the samples generated in air. Energy-dispersive X-ray spectroscopy (EDAX) analysis reveals an increase of the oxide layer on the surface of HP-treated samples. 相似文献
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Ocaña JL García-Beltrán A Laguarta F Armengol J Lupón N Vega F 《Applied optics》1999,38(21):4570-4576
An analysis is given of how nonuniformities in the laser beam intensity translate into variations on the induced temperature distribution on an irradiated sample. The study involves materials with different thermal conductivities. By use of a reshaped irradiating beam obtained with a multifaceted integrating mirror, a three-dimensional numerical calculation allows us to establish both surface and in-depth temperature distributions. The results show that in the case of materials such as glass (i.e., with low thermal conductivity) large thermal gradients occur both on the surface and in depth during irradiation. However, the lateral heat flow is high enough to strongly reduce the surface gradients as soon as the laser irradiation ends. Conversely, in good thermal conductors such as nickel, the laser intensity nonuniformities induce a thermal peaking of the surface with lateral thermal gradients that are by no means negligible. Experimental evidence during laser glass polishing that confirms the numerical assessments are also provided. 相似文献
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《Thin solid films》1986,138(2):157-162
Conventionally cleaned fused silica substrates were irradiated immediately before the coating process with a CO2 laser. We then used electron beam technology to produce SiO, SiO2, ZrO2 and Ta2O5 single-layer and multilayer films. The damage threshold was determined with an Nd:YAG laser (λ=1.06 μm). We observed an increase in the laser damage threshold by a factor of up to 10. 相似文献