共查询到20条相似文献,搜索用时 93 毫秒
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为了研究索尼LCX029CRT液晶显示器纯位相调制特性,设计了索尼LCX029CRT液晶显示器的驱动电路,并搭建了测试光路对其纯位相调制特性进行了研究,同时对光路进行了理论分析。实验获得一组移动的干涉条纹,实验测试研究结果表明索尼LCX029CRT液晶显示器具有π/2的相位调制特性。 相似文献
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高精度纯相位液晶空间光调制器的研究 总被引:18,自引:5,他引:13
研制了平行排列液晶空间光调制器(LC SLM)。论述了平行排列液晶相位调制的理论,进行了计算模拟。对液晶空间光调制器相位调制特性和振幅调制特性进行了测量,实验结果表明,在整个灰度级范围内是纯相位调制的空间光调制器,并且调制的范围可达到0.6λ。在ZYGO菲佐干涉仪上进行了精度特性的研究,得到了非常好的结果,在1cm^2的面积上,进行了畸变波前的调制,其精度峰谷值可达0.098λ,均方根值可达0.017λ。在此精度的基础上产生了π相位差的栅结构,证明了这种液晶空间光调制器可以很好的进行相位调制。 相似文献
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基于空间光调制器的多层图像的构建与可视化 总被引:1,自引:0,他引:1
为解决实时直观地观察多层再现图像的问题,提出利用发光材料实现其可视化.针对由沿光轴方向的二维图层组成的空间图像,利用高效、快速的三维Gerchberg-Saxton算法,得到位相型计算全息图,并通过计算机进行了数字模拟再现.阐述了三维Gerchberg-Saxton算法的流程,并搭建了基于液晶空间光调制器的位相全息图光学再现与可视化光路.利用液晶空间光调制器的灰度-位相曲线把计算全息图转换为灰度图,加载在液晶空间光调制器上,再现出高质量的三维光场,同时利用量子点材料的荧光特性实现了图像的可视化.实验结果表明,光学再现与计算机模拟结果较吻合.该技术在医学、军事、三维显示、微加工以及显微技术等领域有重要应用价值. 相似文献
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为解决实时直观地观察多层再现图像的问题,提出利用发光材料实现其可视化.针对由沿光轴方向的二维图层组成的空间图像,利用高效、快速的三维Gerchberg-Saxton算法,得到位相型计算全息图,并通过计算机进行了数字模拟再现.阐述了三维Gerchberg-Saxton算法的流程,并搭建了基于液晶空间光调制器的位相全息图光学再现与可视化光路.利用液晶空间光调制器的灰度-位相曲线把计算全息图转换为灰度图,加载在液晶空间光调制器上,再现出高质量的三维光场,同时利用量子点材料的荧光特性实现了图像的可视化.实验结果表明,光学再现与计算机模拟结果较吻合.该技术在医学、军事、三维显示、微加工以及显微技术等领域有重要应用价值. 相似文献
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基于纯位相液晶空间光调制器的可变焦透镜的实现 总被引:1,自引:0,他引:1
提出一种基于纯位相液晶空间光调制器(LC-SLM)实现变焦透镜的方法。根据液晶空间光调制器的位相调制原理,以相息图控制LC-SLM来调制入射光波,并衍射产生透镜波面,改变相息图的衍射距离,可实现变焦位相菲涅耳透镜的功能。分析衍射孔径、衍射距离、相息图位相阶数等参数对变焦位相菲涅耳透镜的影响,并以点光源相息图为例对该方法的可行性进行了实验验证。实验结果表明:通过改变计算衍射距离,提出的方法可得到焦距不同的透镜,且易于控制,为三维扫描显示的实现提供了可行性依据。 相似文献
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研究了反射型的LCOS显示器件的相位调制特性.采用2×2的Jones矩阵计算仿真,从理论上分析了它的相位调制特性,建立了一套测量振幅和相位特性的测试系统.它采用He-Ne激光为光源,用干涉仪观察波前相位,将LCOS显示器件作为液晶空间光调制器,用计算机和相关的电路系统驱动控制,并用CCD采样数据,测试了1024×768 LCOS显示器件的相位调制特性.理论和实验的一致性说明了在特定的入射、出射偏振光配制下,LCOS显示器件可以做纯相位调制器.
关键词:
空间光调制器
液晶显示器
反射型LCOS 相似文献
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Fanghong Li Naohisa Mukohzaka Narihiro Yoshida Yasunori Igasaki Haruyoshi Toyoda Takashi Inoue Yuji Kobayashi Tsutomu Hara 《Optical Review》1998,5(3):174-178
An optically addressed parallel-aligned nematic-liquid-crystal spatial light modulator (PAL-SLM) has been studied as a dynamic phase-only light modulation device. The phase modulation characteristics of the PAL-SLM using a liquid crystal display (LCD) as an addressing mask were investigated by analyzing diffraction efficiencies resulting from binary gratings projected from the LCD. A more than 2π phase-only modulation depth was achieved. The highest first-order diffraction efficiency of approximately 38% was also obtained; this is close to the theoretical limit. The experimental results of diffraction efficiencies depending on the phase modulation depth are in good agreement with the simulation for the system operation. 相似文献
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Yasunori Igasaki Fanghong Li Narihiro Yoshida Haruyoshi Toyoda Takashi Inoue Naohisa Mukohzaka Yuji Kobayashi Tsutomu Hara 《Optical Review》1999,6(4):339-344
To realize a high efficiency electrically addressable phase-only modulator, we have coupled a liquid crystal display (LCD) to an optically addressed parallel-aligned nematic liquid crystal spatial light modulator (PAL-SLM) with a set of lenses. Phase modulation exceeding 3ϖ at 532 nm wavelength was obtained. We obtained linear transfer characteristics for phase modulation at various desired phase levels after calibration and adjustment of the transfer characteristics of the PAL-SLM and the LCD. Diffraction efficiency of 40% for binary phase grating and of 90% for 8-level blazed phase grating, which were very close to the simulation values, were observed. The power loss of the readout light was caused when passed through a half mirror, therefore, we examined a setup using an oblique readout light at the modulator. Very high diffraction efficiency was obtained from the setup by optimizing the polarization direction and optical path for this light, and the orientation of liquid crystals. Since the modulator can perform at better than 90% diffraction efficiency and at nearly 100% reflectivity, various high efficiency systems utilizing such modulators are expected. 相似文献
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McOrist J Sharma MD Sheppard CJ West E Matsuda K 《Micron (Oxford, England : 1993)》2003,34(6-7):327-332
Hyperresolving (sometimes called 'superresolving' or 'ultraresolving') phase-only filters can be generated using an optically addressable liquid crystal spatial light modulator. This approach avoids the problems of low efficiency, and coupling between amplitude and phase modulation, that arise when using conventional liquid crystal modulators. When addressed by a programmed light intensity distribution, it allows filters to be changed rapidly to modify the response of a system or permit the investigation of different filter designs. In this paper we present experimental hyperresolved images obtained using an optically addressable parallel-aligned nematic LCD with two zone Toraldo type phase-only filters. The images are compared with theoretical predictions. 相似文献
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A new method was developed for studying dynamic modulation transfer functions (DMTFs) of liquid crystal display (LCD) based
on the slanted edge method, improved wavelet-denoise (IWD) method, and Fourier transformation. Measurements were made for
capturing the images of moving step-edge patterns on the display by a slightly tilted pursuit camera. The scanning-rate and
contrast-dependent DMTFs of a LCD were demonstrated, and the corresponding parameters such as blurred edge width (BEW), spatial
sharpness, and motion picture response time (MPRT) were calculated from the DMTF curves. A simple linear relationship between
these parameters was found. The properties of a cathode ray tube (CRT) display were also measured for comparison with those
of the LCD. 相似文献
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Holographic data storage applications often use liquid crystal displays as spatial light-amplitude modulators for writing data images. The hologram created in the Fourier plane is usually applied to store the information, since this plane supplies optimal data density. A well known technique for homogenizing the light distribution in the Fourier plane is the application of external random phase modulating masks. The requirement for pixel by pixel matched positioning of the phase modulating mask and the pixels of the spatial light-amplitude modulator is hard to solve in the optical systems and any positioning error leads to significant signal degradations. The article analyses the possibilities of realizing the required simultaneous amplitude and phase modulation of light with the application of a single LCD. Twisted nematic LCDs with different maximal birefringence are numerically investigated using the Jones matrix method. Elliptical incident and exit polarizations are proposed, by which ternary phase-amplitude modulation (+1,–1,0) can be realized. Test measurements are also presented that demonstrate the validity of the calculated results. 相似文献
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平行式向列液晶实现相移剪切电子散斑干涉术的研究 总被引:1,自引:1,他引:0
研究了向列型液晶的相位调制特性,采用平行式向列液昌作为相移器建立了相移剪切电子散斑干涉计量系统。该方法将相移技术引入到剪切电子散斑干涉术中,提高了检测精度,采用了相关条纹法求解相位,简化了计算;相移方法简单,可靠。用该系统进行应变场的测量实验,取得了满意的效果。 相似文献
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