傅里叶/4波片双折射检测方法 |
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引用本文: | 索国国,汪相如,黄子强,汤镇辉,杜静.傅里叶/4波片双折射检测方法[J].激光技术,2016,40(1):131-135. |
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作者姓名: | 索国国 汪相如 黄子强 汤镇辉 杜静 |
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作者单位: | 1.电子科技大学电子科学技术研究院, 成都 611731; |
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基金项目: | 国家自然科学基金资助项目,中央高校基本科研业务费资助项目 |
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摘 要: | 为了对液晶光学相控阵的相位调制量进行高分辨率、高精度的自动化测量,采用了傅里叶/4波片法,在常规/4波片法的基础上,结合离散傅里叶变换算法完成数据处理过程,获得更高的测试精度,并且对测试环境的振动、噪声具备更好的抑制能力。实验中,利用微机控制步进电机、CCD等辅助设备,结合傅里叶/4波片法形成自动检测设备。结果表明,将标准/4波片作为测试样品,测试重复精度小于0.3;将自行研制的液晶光学相控阵作为待测样品,获得了其近场的相位分布,可看到样品的相位周期性与电极间相位凹陷等情况。
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关 键 词: | 激光技术 相位分布 傅里叶/4波片法 液晶光学相控阵 |
收稿时间: | 2014-10-28 |
Test method for birefringence of Fourier quarter-wave-plate |
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Abstract: | In order to measure the phase modulation of liquid crystal optical phased arrays ( LCOPA) automatically with high resolution and high precision , Fourier quarter-wave-plate ( FQW) method was adopted .On the basis of the conventional λ/4 wave-plate method, combined with the discrete Fourier transform algorithm to process data , higher accuracy was attained in spite of the influence of vibration and noise in surroundings .In the experiments , automatic test was accomplished with a computer controlling the stepping motor combing accessory devices such as CCD and FQW .The results showed that the repetitive test precision was less than 0.3°taking a standard λ/4 wave-plate as a test sample.The near-field phase distribution for a LCOPA developed by ourselves was obtained and its phase cycle and phase valley between the electrodes was observed . |
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Keywords: | laser technique phase distribution Fourier quarter-wave-plate method liquid crystal optical phased array |
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