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基于液晶空间光调制器的全息显示

夏军 常琛亮 雷威

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基于液晶空间光调制器的全息显示

夏军, 常琛亮, 雷威

Holographic display based on liquid crystal spatial light modulator

Xia Jun, Chang Chen-Liang, Lei Wei
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  • 在传统的纯相位全息显示系统中, 一般基于快速傅里叶变换(FFT)算法来计算相位全息图, 在FFT的计算中需要遵循Nyquist采样定理, 因此, 重建图像的尺寸往往受限于空间光调制器的固定采样率. 这个限制可以通过卷积算法或者两步菲涅耳衍射算法来解决, 但是需要使用多个FFT的计算, 导致计算量增大. 鉴于此, 提出了一种基于透镜的纯相位全息图计算方法. 在全息图的计算中, 通过透镜的成像原理建立一个采样率可变的虚拟全息面, 通过调节相应的距离参数使得在全息图的计算中可以任意调节原始图像的采样率, 摆脱了传统方法中液晶空间光调制器带宽积对重建图像尺寸的限制, 并且这种算法只需使用一次FFT就能达到变采样率的衍射计算, 大幅提高了全息图的计算速度. 数值模拟及光学实验结果证明了此方法可以在全息显示光学系统中清晰地重建不同尺寸的图像. 同时该系统可以有效地消除由空间光调制器的像素化结构带来的零级衍射.
    In conventional phase-only holographic display, the phase-only computer generated hologram is usually calculated based on the fast Fourier transform (FFT) algorithm, in which the Nyquist theory should be satisfied. However, due to the pixel structure of the liquid crystal spatial light modulator and a fixed spatial sampling rate, the size of the reconstructed image is limited by the space-bandwidth product of the liquid crystal phase modulator. The traditional solution is to use convolution algorithm or double-step Fresnel diffraction algorithm to calculate the Fresnel hologram, but FFT has to be calculated many times in both of the methods, thereby increasing the burden of hologram computation. Therefore, in this paper we propose a method to calculate the phase-only hologram based on setting a virtual hologram plane. This virtual hologram plane is set based on the principle of lens imaging. So the calculation of the hologram can be divided into two steps: the first step is to calculate the Fresnel diffraction from the object plane to the virtual hologram plane, and the second step is to calculate the hologram from the virtual hologram plane by being multiplied with a quadratic phase term. In this way, the hologram can be calculated from the original object with any sampling rate we need by adjusting the corresponding parameters of distance. By this method one can calculate the Fresnel diffraction between hologram plane and object plane with variable sampling rates, without considering the space-bandwidth product of the liquid crystal phase modulator, and this algorithm uses only one FFT calculation, which can speed up the calculation of hologram compared with the convolution based method (using three FFTs in calculation) and the double-step Fresnel method (using two FFTs in calculation). Both the computer simulation and the optical experiments demonstrate that the object can be reconstructed with different sizes in the holographic display system. In the optical experiment, the zero-order diffraction can be removed by placing a filter on the back focal plane of the imaging lens and the speckle noise can also be eliminated in order to improve the reconstruction quality by displaying multiple phase-only holograms at a high speed. The proposed method in this paper shows a potential application in zoom-able liquid crystal spatial light modulator based holographic display system.
    • 基金项目: 国家重点基础研究发展计划(批准号:2013CB328803)、国家自然科学基金(批准号:61372030,91333118)、国家高技术研究发展计划(批准号:2012AA03A302,2013AA013904)和江苏省普通高校研究生科研创新计划(批准号:CXZZ11_0152)资助的课题.
    • Funds: Project supported by the National Basic Research Program of China (Grant No. 2013CB328803), the National Natural Science Foundation of China (Grant Nos. 61372030, 91333118), the National High Technology Research and Development Program of China (Grant Nos. 2012AA03A302, 2013AA013904), and the Innovation Project of Jiangsu Graduate Education, China (Grant No. CXZZ11_0152).
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    Zheng H D, Yu Y J, Dai L M, Wang T 2010 Acta Phys. Sin. 59 6145 (in Chinese) [郑华东, 于瀛洁, 代林茂, 王涛 2010 物理学报 59 6145]

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    Okada N, Shimobaba T, Ichihashi Y, Oi R, Yamamoto K, Oikawa M, Kakue T, Masuda N, Ito T 2013 Opt. Express 21 9192

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    Chang C, Xia J, Lei W 2012 Opt. Commun. 285 24

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    Gerchberg R W, Saxton W O 1972 Optik 35 237

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    Zhang H, Xie J H, Liu J, Wang Y T 2009 Appl. Opt. 48 5834

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    Makowski M, Ducin I, Kakarenko K, Suszek J, Sypek M, Kolodziejczyki A 2012 Opt. Express 20 25130

  • [1]

    Xia J, Yin H 2009 Opt. Eng. 48 020502

    [2]

    Haist T, Schonleber M, Tiziani H J 1997 Opt. Commun. 140 299

    [3]

    Yu Y J, Wang T, Zheng H D 2009 Acta Phys. Sin. 58 3154 (in Chinese) [于瀛洁, 王涛, 郑华东 2009 物理学报 58 3154]

    [4]

    Zheng H D, Yu Y J, Dai L M, Wang T 2010 Acta Phys. Sin. 59 6145 (in Chinese) [郑华东, 于瀛洁, 代林茂, 王涛 2010 物理学报 59 6145]

    [5]

    Shimobaba T, Weng J, Sakurai T, Okada N, Nishitsuji T, Takada N, Shiraki A, Masuda N, Ito T 2012 Comput. Phys. Commun. 183 1124

    [6]

    Muffoletto R P, Tyler J M, Tohline J E 2007 Opt. Express 15 5631

    [7]

    Shimobaba T, Kakue T, Okada N, Oikawa M, Yamaguchi Y, Ito T 2013 J. Opt. 15 075302

    [8]

    Shimobaba T, Makowski M, Kakue T, Oikawa M, Okada N, Endo Y, Hirayama R, Ito T 2013 Opt. Express 21 25285

    [9]

    Zhang F, Yamaguchi I, Yaroslavsky L P 2004 Opt. Lett. 29 1668

    [10]

    Okada N, Shimobaba T, Ichihashi Y, Oi R, Yamamoto K, Oikawa M, Kakue T, Masuda N, Ito T 2013 Opt. Express 21 9192

    [11]

    Chang C, Xia J, Lei W 2012 Opt. Commun. 285 24

    [12]

    Gerchberg R W, Saxton W O 1972 Optik 35 237

    [13]

    Zhang H, Xie J H, Liu J, Wang Y T 2009 Appl. Opt. 48 5834

    [14]

    Makowski M, Ducin I, Kakarenko K, Suszek J, Sypek M, Kolodziejczyki A 2012 Opt. Express 20 25130

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出版历程
  • 收稿日期:  2015-01-19
  • 修回日期:  2015-03-24
  • 刊出日期:  2015-06-05

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