共查询到17条相似文献,搜索用时 156 毫秒
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本文叙述了用于耦合紫金山天文台60cm反射望远镜卡焦点及位于观测层下面试验室内的棱镜摄谱仪的天文光纤耦合器。单根熔石英光纤的长度为25m,芯径50μm,数值孔径0.2,多模梯度折射率型。在光纤的两端采用了直径1mm 的GRIN 棒透镜作变焦透镜。用这种耦合器进行了观测试验,首次拍下了aLy~r 星的光谱。 相似文献
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锗酸盐系统玻璃具有一系列优越的物理化学性质。玻璃折射率高,在1-6μ波段具有良好的红外透过率,是很好的红外光学材料。但是,由于GeO2原料的价格较贵,玻璃成本高,使锗酸盐玻璃的应用受到限制。本工作探讨了铝钙玻璃的形成规律,系统地研究了将Al2O3、CaO两种氧化物引入到锗酸盐系统玻璃中,对玻璃析晶、化性、透射光谱、密度、硬度、折射率、色散、热膨胀系数、光吸收系数、软化温度等十项物理化学性质的影响。 相似文献
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玻璃在加压状态下退火后,它的物理性质,例如折射率、密度等,与非加压状态下退火的玻璃比较,变化很大.这种现象被称为玻璃的“热应力效应”.本工作使用在弯曲加压下退火的矩形棒状玻璃样品,利用干涉法研究了五种光学玻璃的折射率热应力效应.在光学玻璃的退火过程中,当冷却经过玻璃的退火温度范围时,在玻璃毛坯中产生了热应力;由于热应力效应引起了玻璃折射率的不均匀分布.本工作进行了有关热应力对退火玻璃光学均匀性的影响的实验,并根据实验结果估算了这一影响的大小. 相似文献
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氧化镁晶体在太赫兹波段的性质得到了广泛的关注。基于太赫兹时域光谱系统,在0.2~2.6THz对氧化镁晶体的光学特性进行分析。从测得的透过率和相移提取晶体的折射率和吸收谱。通过数据分析处理,实验得到该波段氧化镁晶体的折射率在2.76~2.78之间,且随着太赫兹频率的增加其透过率逐渐减小。进一步分析表明,氧化镁晶体在太赫兹波段无明显反常色散和吸收峰。 相似文献
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提出了基于曲线拟合的光纤透镜聚焦常数的测试方法,用于超小自聚焦光纤探头研制过程中聚焦常数的直接测试。基于自聚焦光纤透镜模型及其折射率分布特征,研究了测量自聚焦光纤透镜聚焦常数的二次多项式拟合和线性化拟合算法。论述了聚焦常数对超小自聚焦光纤探针传光性能的影响。利用光纤端面折射率测试仪测试自聚焦光纤的折射率分布轮廓曲线,根据二次多项式拟合和线性化拟合算法分别求得聚焦常数和中心折射率。实验结果显示,利用二次多项式拟合算法和线性拟合算法求出的聚焦常数分别为5.587mm-1和5.513mm-1,与厂家的标称值5.5mm-1基本吻合,表明曲线拟合算法适用于对自聚焦光纤透镜聚焦常数的测量与分析。 相似文献
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In this paper, a simple nondestructive method is described to obtain the refractive index profile of a gradient refractive index rod lens by means of optical coherence tomography. The approach exploits the fact that optical coherence tomography provides a direct measurement of the optical path of the light traveled through a gradient refractive index rod lens. The refractive index profile for a gradient refractive index rod lens is retrieved by iterative fitting of the optical path calculated by the ray tracing method with that experimentally measured using optical coherence tomography. The measured refractive index profile is in good agreement with theory. 相似文献
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1Introduction Inhomogeneouscoatingswithawell defined continuousrefractiveindexprofilealonganaxis thatisperpendiculartothefilmsurface,suchas so calledgradientindexlayersandrugatefilters representnewandprospectivethinfilmdesigns.Particularly,thelowopticalscatterlevelandthe wideaccessibleangularrangemakethemsuperi ortotraditionalstackswithrespecttoselected applicationssuchasnotchfilteroromnidirec tionaldevices[1].Manufacturingsuchsystemsin practicerequiresnewsynthesis,adapteddeposi tionprocessesa… 相似文献
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《Measurement》2016
The curve-fitting algorithm is adopted to measure the focusing constant of a gradient-index (GRIN) fiber lens, which is used to further design ultra-small GRIN fiber probes. Firstly, the refractive index profile of a GRIN fiber lens is acquired by using the Optical Fiber Refractive Index Profile tester. And the focusing constant of the GRIN fiber lens is obtained by means of the curve-fitting algorithm of quadratic polynomial. Secondly, the measured focusing constant is used to design ultra-small GRIN fiber probes with different focusing properties. Thirdly, according to the designed optical probe models, GRIN fiber probe samples have been fabricated and tested. Finally, comparative analysis is conducted between the theoretical focusing performance parameters and the experimentally measured values. The results show that, in the given condition, the fitted value of the focusing constant of GRIN fiber lens and the theoretical focusing performance parameters of GRIN fiber probes, respectively agree well with the nominal value provided by the manufacturer and the experimentally measured data. Therefore, the proposed methods of measuring the focusing constant of GRIN fiber lens and its application in designing GRIN fiber probes are validated and feasible to further developing ultra-small GRIN fiber probes requiring specific optical focusing performance. 相似文献
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摘要: 准确测量光学玻璃的折射率已成为了保证光学系统成像质量非常重要的环节。本文介绍了光学玻璃折射率测试方法和国内外发展现状。提出了一种利用测量棱镜三个顶角所对应的三个最小偏向角的折射率测量新方法,该方法的特点是测量精度随被测光学玻璃的折射率增大而提高。在精度0.5²的测角仪上,折射率测量精度高于1x10-6。文中推导出了新方法的计算公式,并对精度做了理论分析。该方法由于测量精度高,有较好的应用前景。 相似文献