共查询到19条相似文献,搜索用时 78 毫秒
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应力作用下光纤光栅Bragg波长调谐特性的研究 总被引:10,自引:3,他引:7
本文对1550nm光纤光栅在纵向拉伸应力和侧向拉伸应力作用下Bragg波长的偏移特性进行了实验研究。当纵向拉伸应力加至3.60N(367.60g)时,得到了5.02nm的调谐范围。这可能是在相同应力作用下,目前所报道的最好结果。此外,还对光纤光栅弯曲所导致的其Bragg波长的迁移特性进行了实验研究,并比较了对光纤光栅段添加涂覆层前后的调谐情况,得到了最大为3.02nm的皮长调谐范围。 相似文献
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建立了两个不同波长激光同时辐照薄膜的损伤阈值测试装置,实验研究和对比1064 nm激光,532 nm激光,1064 nm和532 nm激光共同作用3种不同方式辐照1064 nm和532 nm增透膜(ARF)的损伤阈值及其损伤形貌.结果表明,1064 nm和532 nm激光共同作用损伤形貌和532 nm激光单独作用下的形貌相似,532 nm激光在诱发薄膜损伤因素中起主导作用.1064 nm激光单独辐照薄膜的损伤阈值高于532 nm激光,而1064 nm和532 nm激光共同作用下薄膜的阈值介于这两者之间. 相似文献
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LD端泵浦1 319 nm 3.11 W-CW Nd:YAG激光器 总被引:1,自引:0,他引:1
报道了LD端面泵浦Nd:YAG晶体实现1319nm单波长连续输出的研究。通过对输出镜镀选择性介质膜,抑制了1064和1338nm光波在腔内的振荡。在功率为26.03W的808nmLD泵浦下,得到1319nm单波长最大输出3.11W。对1319nm单波长运转条件进行了理论分析,得到1319nm单波长运转区域图,描述了1319nm单波长运转时输出镜对1319nm和1338nm光波透过率应满足的关系,为实现1319nm单波长运转提供了理论指导。实验结果与理论分析结果相互吻合。 相似文献
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为系统研究不同波长激光与多晶硅材料的相互作用,采用1 064 nm、532 nm、355 nm波长单脉冲激光对多晶硅进行辐照实验,研究多晶硅在这三种波长激光下的损伤形态。实验结果表明:在其他参数不变的情况下,损伤阈值随激光波长的减小而变小,且与波长呈线性关系;在低能量密度水平下,355 nm激光与物质作用主要是以光化学模型为主的光化学-光热共同作用方式,其他波长为光热模型;在激光能量密度处于低水平时,辐照区域出现相互连接的规则六边形微结构,并且六边形中心呈现圆形凸起状态,其产生是由液体横向流动的波动本质造成的,并与多晶硅表面的粗糙度有关。 相似文献
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双波长光纤光栅外腔半导体激光器中波长转换 总被引:2,自引:0,他引:2
提出了基于双波长光纤光栅外腔半导体激光器增益饱和效应的全光波长转换方案,特点是可将输入信号同时转换到激光器的2个波长上。在静态波长转换实验中,观察到了1554.8nm输入信号对激光器1531.5nm与1549.4nm波长输出功率的增益饱和作用。表明可实现输入信号到激光器的两个波长的同时转换。 相似文献
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The shift mechanism of Bragg wavelength with stress variation for a fiber grating is investigated in detail.The influence of strain change on reflection and bandpass is theoretically analyzed.By applying stress, the dynamic single/dual-channel filter with tunable fiber Bragg gratings is achieved. 相似文献
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The corrosion of steel bar embedded in concrete can be detected from the Bragg wavelength shift of the fiber Bragg gratings (FBGs) winding around the steel bar. Previously, when the steel bar in concrete is surrounded by the FBG, the corrosion, which is proportional to the expansion of the bar cross-section, was predicted simply from the well known relationship of the Bragg wavelength shift and the only axial strain of the FBG. However, as the FBG is embedded in the concrete, stresses from all directions will apply to it. In this case, the Bragg wavelength change will attribute to stresses coming from the axial strain as well as the lateral strain. Therefore, the relation between the Bragg wavelength shift and the axial strain of FBG should be modified. We use a cylindrical and elastic model to analyze the strain distribution of a steel bar embedded in the concrete, and obtained a new relation between the Bragg wavelength shift of the FBG wrapped around the steel bar and the axial strain of the fiber. With this modified coefficient the corrosion of the steel bar embedded in the concrete can be predicted more accurately. 相似文献
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光纤布拉格光栅横向应变特性的研究 总被引:9,自引:6,他引:3
根据耦合模理论,对光纤布拉格光栅(FBG)的横向应变特性进行了深入研究,并采用数值分析方法对光纤布拉格光栅在平面应变和应力情况下进行了模拟分析:对于平面应变情况,一个谐振峰向波长增大的方向移动,而另一个谐振峰向波长减小的方向轻微移动;对于平面应力情况,两个谐振峰都向波长增大的方向移动。设计了相应的实验进行验证,实验结果与理论分析相符;该实验结果表明光纤布拉格光栅的横向应变情况介于平面应力和平面应变之间,而且更接近平面应力情况。根据理论分析,横向应变与纵向应变对波长漂移的贡献不一样,从而使三维应变测量成为可能。 相似文献
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Kumazaki H. Yamada Y. Nakamura H. Inaba S. Hane K. 《Photonics Technology Letters, IEEE》2001,13(11):1206-1208
We studied a tunable wavelength filter using a single-mode fiber Bragg grating with a cladding thinned by reactive plasma etching. Reflection wavelength shifts were demonstrated by controlling the effective refractive index or the period of the grating. When liquid paraffin was used for additional cladding on a thinned grating fiber of 19-μm diameter, the shift rate of 0.055 nm/°C was obtained. In the case of applying the tension to the grating region, the shift rate was 3.4 nm/100 V for the fiber of 41-μm diameter 相似文献