共查询到19条相似文献,搜索用时 93 毫秒
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石英晶体的色散方程及折射率温度系数 总被引:5,自引:3,他引:2
研究了石英晶体在不同温度下折射率随波长的变化规律.通过对Sellmeier方程严格求解,得出了其系数表达式,计算出了不同波长对应的折射率,经验证与实验值符合得很好.通过曲线拟合求解出了折射率温度系数表达式,由此式可计算出不同波长折射率温度系数;进一步求解出了Sellmeier方程常量随温度变化地数值,得到求解不同温度任意波长的石英晶体主折射率的一种方法. 相似文献
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1310nm波段石英晶体旋光性的温度效应测试研究 总被引:1,自引:0,他引:1
为了测试温度对1310nm波段石英晶体旋光性的影响,采用高低温试验箱作为温控器,设计了双光路检测系统对石英晶体在1310nm波段旋光性的温度效应进行测试研究。实验结果表明,在-10~20℃温度范围内,对于确定波长的光,随温度的升高,石英晶体的旋光率增大;在25~50℃温度范围内,随温度的升高旋光率减小;对于同一温度,波长越长旋光率越小。根据测试结果求解Sellmeier方程得出了Sellmeier方程的常数与温度的关系式,从而可以得出任意温度下不同波长对应的石英晶体的旋光率。 相似文献
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高掺镁铌酸钾晶体的主折射率及其温度系数的测量 总被引:1,自引:0,他引:1
本文报道掺5mol%MgO的铌酸锂(liNbO_3)晶体的主折射率n_o、n_o及其温度系数.用自准直法在0.5398μm、0.6328μm、1.0795μm和1.3414μm波长上,并在20℃~160℃温度范周内,测量了该晶体的主折射率,并获得在这些波长上的折射率温度系数.修正的Sellmeier方程的常数也在20℃~160℃温度内推算出.用此结果计算室温的二次谐波I类临界相位匹配角与实验值符合得很好,又计算二次谐波的非临界相位匹配温度,其结果也与实验值较符合. 相似文献
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高掺镁LiNbO3晶体折射率温度系数的表示式 总被引:2,自引:0,他引:2
推导了掺5mol%MgO的LiNbO3晶体折射率温度系数的表示式。利用这些表示式可以计算293~428K温度和0.5398μm~1.3414μm波长范围内的折射率温度系度,结果表明:计算值和实验值的最大相对偏差是12%,用具有最大相对偏差的折射率温度系数的计算值,计算1.0795μm波长的非临界相位匹配温度,其值为382.4K,它与实验值仅差6K。因此,本文得到的表示式,对于采用这种晶体,设计在上 相似文献
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《光学学报》2015,(9)
为了了解有色冰洲石晶体经热处理退色后光学性能的变化,实验探索了黄色及紫色晶体的退色条件。采取同一块有色晶体分为两个部分,再将退色与未退色的两部分一起抛光制作样品,设计实验对样品的透射比、消光比和主折射率进行了测试。结果表明:黄色与紫色冰洲石晶体的退色温度分别为405℃和485℃(恒温4 h)。退色后,晶体的消光比与主折射率没有变化,深黄色、轻黄色和紫色冰洲石晶体的透射光谱向紫外都有较大的拓展,尤其是深黄色晶体,不但透射范围向紫外延伸了约130 nm,而且400~600 nm波段内透射比有了较大的提高。由此可见,退色后有色冰洲石晶体达到了光学级晶体的光学性能。将有色冰洲石晶体进行退色利用,对于有效利用冰洲石晶体天然资源具有重要意义。 相似文献
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Shuang Zhao Fuquan Wu Haifeng Wang Weigang Zhong Xiuzhen Li Hengjing Tang Meng Shi Hongyan Deng 《中国光学快报(英文版)》2007,5(4)
The main refractive indices of calcite crystal are measured by the means of auto-collimation, and the thermo-optical coefficients are calculated. The coefficient expression of Sellmeier equation is obtained by solving Sellmeier equation strictly and the refractive indices of different wavelengths are calculated, which accord with experimental esultsery well. The measured main refractive indices of calcite at 488-nm wavelength are identical with the values obtained by Sellmeier equation. 相似文献
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采用德国Trioptics公司生产的新一代全自动高精度折射率测量仪,测量了磷酸二氢钾(KDP)晶体不同部位的样品位于近紫外到近红外波段(0.253—1.530μm)内12个不同波长处的折射率,测量精度达到10-6量级.结果表明,大尺寸KDP晶体不同部位样品的折射率存在不均一性,靠近晶体恢复区的样品折射率小于晶体锥头区的样品折射率,偏差在10-5—10-4量级.研究发现,这种折射率不均一性与晶体不同部位的结晶质量存在差异有关.另外,将测量数据与其他文献中的数据进行对比.结果显示,所测试的样品数、波段宽度、测量点数量以及数据的精度均超过其他文献,结合测试条件分析了不同文献数据存在差异的原因.最后,使用最小二乘法拟合得到了KDP晶体较为可靠的Sellmeier方程. 相似文献
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通过求解严格的耦合模理论建立的三包层结构长周期光纤光栅特征方程,研究了三包层长周期光纤光栅谐振波长与第二包层(薄膜)的折射率和厚度之间的关系。结果发现,随着膜厚及折射率的增大,谐振波长偏移的变化分成三个区域,这与Nicholas D R的实验结果相符。利用HE/EH模的判据数,对三个区域的模特性进行了分析,给出了区域划分的衡量标准。给出了在不同薄膜参数时的长周期光纤光栅透射谱,发现一阶低次HE模式的耦合强度要远大于一阶低次EH模式。 相似文献
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Starting from the concept of rapidity considered as generalization of the group velocity, we establish a generalized mathematical expression for the refractive group index of a material medium with little refraction at sufficiently small wavelengths, this index becoming approximately the refractive index at the geometric-optics limit and the phase velocity being approximately equal to the group velocity at the above limit. As main result, we derive an approximate relationship for the refractive index of a medium of small refraction at the geometric-optics limit. This medium is found to be left-handed at sufficiently small wavelengths. 相似文献
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Stefan Kedenburg Andy Steinmann Robin Hegenbarth Tobias Steinle Harald Giessen 《Applied physics. B, Lasers and optics》2014,117(3):803-816
We use liquid-filled capillary fibers with different core diameters to precisely characterize the nonlinear refractive index of the highly nonlinear liquids carbon disulfide, nitrobenzene, and toluene. We present measurements with two different femtosecond pump sources at wavelengths of 1032 and 1560 nm. The large nonlinearity of the liquids results from the retarded nonlinear optical response of the liquid molecules which includes a strong non-instantaneous contribution due to molecular reorientation. The nonlinear refractive index of the liquids is determined by fitting numerical simulations based on solving the generalized nonlinear Schrödinger equation including retarded response to the measured broadened output spectra. Our work is important for the novel field of near- and mid-IR supercontinuum generation in liquid-core optical fibers. 相似文献
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We present a temperature-dependent Sellmeier equation for the refractive index of stoichiometric LiTaO3. The extraordinary refractive index, for the range 0.39-4.1 microm and for temperatures of 30-200 degrees C, are based on previously published data [Jpn. J. Appl. Phys. 41, 465 (2002)] and on measured data derived from quasi-phase-matched (QPM) resonances. We used the new Sellmeier coefficients that we obtained to calculate the QPM wavelengths for an optical parametric oscillator (OPO) based on periodically poled stoichiometric LiTaO3 pumped at 1064 nm. The measured wavelengths of the OPO were in good agreement with our predictions. 相似文献
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This recent study shed demonstration on how the structural parameters changes due exposure to UV radiation and different wavelengths. So this article throws light on the changes of the optical properties and some structural properties due exposure to UV radiation and different wavelengths on irregular rayon acetate fibers. Pluta polarizing interference microscope is used to study the changes for refractive indices and birefringence with different exposure times at three different intensities on irregular rayon acetate fibers. As the principal optical parameters determined, these give an indication of the isotropic refractive index, stress optical coefficient, stress due to UV radiation, optical configuration parameter, segment anisotropy, the number of molecules per unit volume and polarizability of a monomer unit can be obtained. Also by using different wavelengths are given the spectral dispersions, Cauchy's dispersion constants, the resonant wavelength, the oscillation energy, the dispersion energy, the dielectric constant and the dielectric susceptibility for rayon acetate fibers with different wavelengths at room temperatures. Illustrations are given using graphs and microinterferograms. 相似文献
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We derived a temperature-dependent Sellmeier equation for Al(x)Ga(1-x)As material by measuring the refractive index of GaAs and AlAs with temperature dependence in a resonant cavity enhanced structure. The equation is applicable in the range of 1460-1580 nm and 26-86 degrees C and can be extrapolated to the other wavelengths and temperature ranges as well. 相似文献