共查询到20条相似文献,搜索用时 15 毫秒
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斜入射法检测平面反射镜的面形误差 总被引:1,自引:0,他引:1
为实现用小口径面形干涉仪完成对大口径光学镜面面形的检测,发展了斜入射检测方法,增大投射到待测镜上光斑的尺寸,从而增大干涉仪检测的镜面口径范围。推导了斜入射法检测平面反射镜面形的公式,并考虑了此方法可能引入的误差。对尺寸为124 mm×42 mm的平面反射镜分别在垂直和不同斜入射角条件下进行了测量,垂直入射时测得镜子工作表面面形起伏高度均方根(RMS)和峰谷(PV)值分别为16.3 nm和67.8 nm,斜入射时测得镜子工作表面的面形起伏高度RMS和PV值分别为16.8 nm和68.7 nm,相对误差分别为3%和0.9%,可以满足第三代同步辐射光束线的要求。 相似文献
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对液晶空间光调制器(LC-SLM)在读出光斜入射下的理论进行了推导,建立了读出光斜入射时液晶空间光调制器的理论模型,并进行了模拟计算。以正入射时液晶空间光调制器的电压—输出光强的关系,推导出液晶空间光调制器在不同调制电压下液晶分子的转角,从而进一步计算相位差。结果表明,随着入射角的增加,液晶层的相位调制深度逐渐减小;随着分子倾角的减小,相位调制深度逐渐升高,即随着写入光的增强,加到液晶层两端的电压增加;随着入射角的增加,读出光强的初相位逐渐减小,但该初相位值并不大,即使在入射角10°下达到最大,也仅为0.21π。计算结果与实验数据相吻合。 相似文献
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Ömer Kavaklıoğlu Baruch Schneider 《Journal of Infrared, Millimeter and Terahertz Waves》2008,29(4):329-352
A rigorous analytical representation for the multiple scattering coefficients of the fields radiated by an infinite grating of dielectric circular cylinders excited by an obliquely incident plane electromagnetic wave is derived in terms of the “well-known scattering coefficients of an isolated dielectric cylinder at oblique incidence” and “Schlömilch series”. In addition, a generalized sum-integral grating equation is acquired for the multiple scattered amplitude of a cylinder at oblique incidence in the grating in terms of the scattering coefficients of the insulating dielectric circular cylinder at oblique incidence. 相似文献
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The scattering of dielectric periodic structures by a plane wave incident in the direction oblique to the periodic grooves is analyzed by a method which combines the multimode network theory with the rigorous mode matching method. Combining the TE and TM characteristic mode functions determined in the corresponding 2-D scattering problem resulting from a TE or TM wave incident along the principal-plane of the same structure, and using a simple mathematical transformation, the 3-D scattering problem by an oblique incidence is rigorously solved. 相似文献
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本文应用叠加原理分析了在非线性介质(Kerr介质)与真空界面反射波的量子统计。发现尽管非线性作用只发生在介质和透射波之间,反射波并不进入非线性介质,但透射波将影响反射波,反射波不再为相干态。 相似文献
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基于多光束干涉原理,推导了非平行角度调谐薄膜滤光片在斜入射时的高斯光束反射光强表达式。在此基础上研究了高斯光束的入射角以及非平行滤光片两端面间所存在楔角对反射光强分布的影响。计算和实验结果都表明,滤光片的反射光强分布不仅与入射角有关,而且非平行滤光片两端面间楔角的大小和正负特性还会在一定程度上影响斜入射时滤光片的光场分布、反射率和隔离度。要保证滤光片在斜入射时反射率和隔离度的稳定,既可以在切片时提高滤光片的平行度,也可以通过在斜入射时保证楔角为负来实现。 相似文献
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基于掠入射X射线反射谱的Mo/Si多层膜扩散系数测量 总被引:3,自引:0,他引:3
测量了Mo/Si多层膜在250℃下经历不同时间退火后的掠入射X射线反射谱,从中提取出特定级次衍射峰在退火过程中的相对移位,通过布拉格公式拟合,得到了Mo/Si多层膜周期厚度皮米级别的相对变化。采用扩散控制模型来描述Mo/Si多层膜界面扩散,界面厚度的平方随时间线性增加,由此拟合得到Mo和Si间的扩散系数为0.33×10-22 cm2/s。采用四层模型,对掠入射X射线反射谱进行全谱拟合,得到了Mo,Si和扩散层MoSi2的密度分别为9.3,2.5和5.4g/cm3,据此对Mo和Si间扩散系数进行修正,最终得到在250℃下,Mo/Si多层膜中Mo和Si间的扩散系数为1.88×10-22 cm2/s,从而为研究Mo/Si多层膜的热稳定性提供了定量依据。 相似文献
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斜角入射沉积TiO_2薄膜的光学特性和表面粗糙度 总被引:3,自引:0,他引:3
采用电子束热蒸发技术在K9玻璃基底上以不同的沉积入射角沉积了单层TiO2薄膜,研究了不同入射沉积角沉积的TiO2薄膜的光学特性、填充密度和表面粗糙度,并比较了不同膜层厚度下薄膜表面粗糙度与入射沉积角之间的关系。研究结果表明,随着入射沉积角的增加,TiO2薄膜的透射率增加,透射峰值向短波移动,薄膜的填充密度从入射沉积角0°时的0.801降低到入射沉积角为75°时的0.341;薄膜的表面粗糙度随着入射沉积角的增加而增加,当入射沉积角为75°时,薄膜的表面粗糙度略高于基底的表面粗糙度。在沉积入射角不变时,随着膜层厚度的增加,膜层的表面粗糙度降低。 相似文献
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《Microwave Theory and Techniques》1975,23(1):134-141
The reflection of a locally plane wave from a curved interface between two nonabsorbing dielectric media is investigated. Our analysis is applicable to an interface of general shape, defined at each point by the two principal radii of curvature. When the wave is incident from the denser medium at angles greater than the critical angle it is only partially reflected, due to a form of electromagnetic tunneling. Generalized Fresnel transmission coefficients and an extension of Snell's law are derived to account for this transmission into the less dense medium. Ray tracing can then be applied to determine such phenomena as the bending losses in optical slab waveguides, and the curvature loss of skew rays within straight optical waveguides of circular cross section. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1978,66(12):1653-1654
Recently, Censor presented an incorrect analysis of the reflection of light from a corner reflector moving at a high velocity. A correct analysis is now presented and experiments suggested by Censor are shown to be impracticable. 相似文献
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《Microwave Theory and Techniques》1960,8(4):440-445
The scattered field is given as a series of cylinder functions. If the ferrite cylinder is magnetized along its axis the scattering pattern becomes asymmetrical about the direction of incidence. Approximation formulas for the thin cylinder and the far field zone are given. It is shown that in the first approximation the amplitude is an even function and the phase angle of the field is an odd function of the scattering angle. Exact numerical results have been obtained with a Univac digital computer. By a suitable arrangement of the ferrite cylinders, a unidirectional pattern can be obtained which is controlled by the applied magnetic dc field. 相似文献
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A simple calculation is made for the power spectral density (psd) of a sinusoid phase modulated by a filtered Gaussian process. The premodulation filter has a Gaussian-shaped frequency response. Design curves are presented for the out-of-band interference, the in-band power, and the psd in terms of the premodulation filter's bandwidth and the rms modulation index. 相似文献