共查询到20条相似文献,搜索用时 140 毫秒
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理想自聚焦棒透镜和Maxwell鱼眼微球透镜对有限远物点成像及球差 总被引:2,自引:0,他引:2
本文用变折射率介质中的光线理论研究了具有双曲正割折射率分布的理想自聚焦棒透镜对有限远物点成像的像距及其纵、横向球差的计算公式。并将它与Maxwell鱼眼微球透镜对有限远物点的成像作对比。严格的数值计算结果表明:两类透镜的纵、横向球差都随折射率梯度的增强而减小。弱梯度时棒透镜比球镜的球差小;但强梯度短物距时球透镜可达到比棒透镜的球差小一、两个数量级。 相似文献
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麦克斯韦鱼眼微球透镜的研究 总被引:10,自引:0,他引:10
自麦克斯韦鱼眼透镜理论模型提出后,长期以来学术界一定以为它只是一种色对光学仪器,在实践中并没有应用的可能。但通过对麦克斯韦鱼眼微球透镜的理论研究表明,在一定条件下,它具有良好的成像性能和耦合效率。采用复合结构及多阶段离子交换工艺可制备出优质的麦克斯韦鱼眼球透镜,在微小光学和集成光学具有诱人的应用前景。 相似文献
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本文报导一种球面梯度透镜,它是用离子交换方法制得的。文章从菲克定律出发求得了折射率分布函数。并推导了在梯度球中光线的轨迹方程,列举了几种折射率分布的计算结果。文中还附有所拍摄干涉条纹的相片。 相似文献
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近年来人们对变折射率分布中的球对称分布的研究日渐重视。本文进一步深入分析了球对称折射率分布,证明球对称分布中光线的倾斜度核心值即为其积分不变量;一个令人惊异的结果是,麦克斯韦透镜中任意共轭点之间的光程都相等,并可用分布参数表为π/2n0a。 相似文献
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CRIN球透镜的光线轨迹方程式的研究 总被引:1,自引:0,他引:1
由于GRIN球透镜的光线轨迹为通过对称中心的平面曲线,所以本文研究了折射率呈二次抛物线型的GRIN球透镜在极坐标下的光线轨迹方程式。 相似文献
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通过统计线性化研究梯度折射率棒状透镜的离散分布参数对光线追迹的影响,介绍了获得平均值和方差的一种方法。根据所研究的例子,发现光线轨迹明显地受到离散参数的影响。 相似文献
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变折射率介质是折射率按一定规律变化的介质,又称为非均匀介质、梯度折射率介质或渐变折射率介质.这种介质在自然界普遍存在.早在公元100年,就有人研究大气层(非均匀介质)的折射现象.在光学系统中,麦克斯韦在1854年首先设计了折射率对某点呈球对称的“鱼眼”透镜.1905年,伍德设计了一个折射率和径向距离有关的伍德透镜.但由于制作工艺没有解决,因而变折射率透镜发展十分缓慢. 1968年,日本北野一郎等人[1]首先采用离子交换工艺制成变折射率透镜,称为自聚焦透镜.此后,人们对这领域的理论、制作工艺、测试、光学设计、加工、器件等方面作了较深… 相似文献
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Fabrication of gradient refractive index ball lenses 总被引:1,自引:0,他引:1
Hao Lv Bangren Shi Jijiang Wu Lijun Guo Aimei Liu 《Optics and Lasers in Engineering》2008,46(3):252-256
The theoretical model of the Maxwell fish eye sphere lens has long been regarded as an absolute optical instrument without practical application since it was proposed. But the study on the theory of Maxwell fish eye micro-spherical lens shows that at certain condition it has fine image formation ability and coupling efficiency. Based on the Fick's diffusion equations, the distribution function of refractive index of gradient refractive index (GRIN) ball lenses is derived. Lithium-containing silicate glass is fabricated and GRIN ball lenses whose diameters are from 0.3 to 3.0 mm are made by ion exchange and the sagging method in sodium nitrate. Radial refractive index profiles of these GRIN ball lens are measured by interferometer. Results show that the distribution of the index of refraction is a parabolic curve and in concordance with the computational consequence and its Δn is 0.0002. 相似文献
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Based on the Fick’s diffusion equations, the distribution function of refractive index of a gradient refractive index ball lens (GRIN ball lens/GBL) is derived. Lithium containing silicate glass is fabricated and GRIN ball lenses (GBLs) which diameters are from 0.3 mm to 3.0 mm are made by the method of combination of Ion exchanging and sagging in sodium nitrate. Refractive index profiles of these GBLs are measured by interferometer, and the performances such as effective focal length (EFL), back focal length (BFL) and numerical aperture (NA) between GBLs and homogeneous ball lenses (HBLs) are compared. Results show that the distribution of the index of refraction is parabolic curve and its Δn is about 0.0002, the performances of the former are super to the latter. 相似文献
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This paper outlines an improved technique for profiling the refractive index of Graded-index (GRIN) lenses based on the measurements obtained from a reflectivity image. Reflective cross-sectional image of the GRIN lens were compared with a reflectance reference target under illumination at small incidence angles to obtain the full-field refractive index distribution of the GRIN lens quickly and easily. 相似文献
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The surfaces and refractive index of crystalline lens play an important role in the optical performance of human eye.On the basis of two eye models,which are widely applied at present,the effect of lens surfaces and its refractive index distribution on optical imaging is analyzed with the optical design software ZEMAX (Zemax Development Co.,San Diego,USA).The result shows that good image quality can be provided by the aspheric lens surfaces or (and) the gradient-index (GRIN) distribution.It has great potential in the design of intraocular lens (IOL).The eye models with an intraocular implantation are presented. 相似文献
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A mathematical model for research on the refractive index profile (RIP) of multistep ion exchange processes (IEPs) of gradient refractive index rod lenses (GRINs) is established by the different initial condition and boundary condition, based on the Fickian diffusion equation. GRIN rod lenses have been fabricated using the three-step IEPs. Research results indicate that the experimental deviations of refractive index (DRI) are in good agreement with the theoretical data. The DRI of three-step IEPs is superior to the one- and two-step IEPs and smaller than 10(-5). 相似文献
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The aberration of gradient index (GRIN) rod lenses induced by deviation from the ideal refractive index distribution is decreased by optimized thermal diffusion. The index distribution coefficients are estimated by a novel method. The lenses' heat treatment process and aberration testing system are described. 相似文献
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作为口腔内窥镜的摄像镜头,利用梯度折射率透镜质量轻、体积小、结构简单、分辨率高、成像景深大的优点,研制出一套适合医患交流及进行口腔检查与治疗的医疗装置。采用修正折射率剖面的梯度折射率透镜, 降低系统渐晕,减小畸变,获取口腔内部图像,经CCD光电转换装置转换成电信号,再将电信号经过数字信号处理以后,将该数字信息存储于计算机内部或在显示器上显示出来。口腔内窥镜是集梯度折射率透镜、光学原理、光学材料与加工、微电子、数字成像技术等为一体的新型医疗设备。特别是采用经修正的梯度折射率透镜制造的口腔内窥镜成像清晰, 在图像畸变、景深等方面优于现有产品,而且便于对患者的各种信息进行管理、查询、输出等。 相似文献
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Shuma Horiuchi Shuhei Yoshida Zenta Ushiyama Manabu Yamamoto 《Optical and Quantum Electronics》2010,42(2):81-88
Plastic gradient-index lenses produce clear images with negligible aberration and distortion. One of the methods for fabricating
these lenses involves pulling up the core fiber vertically from a polymer solution whose refractive index has been adjusted
to the desired value. Since the molecules from the solution diffuse into the inner layer, the monomer components are distributed
in the radial direction. The monomer distribution is fixed in the photopolymerization process, and this forming process is
repeated several times with adjusting the composition of the solution; hence, a specific refractive index distribution is
obtained. We considered a numerical model of the interdiffusion process and analyzed refractive index distribution that could
well reproduce the experimental results. Moreover, we employed the ray tracing method to calculate the modulation transfer
function and used the transfer function to evaluate the GRIN lens performance. Simulation results showed that our evaluation
method well duplicates the experimental results. We thus developed an integrated simulation method for the fabrication and
performance evaluation of GRIN lenses. 相似文献
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