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Method for the measurement of phase retardation of any wave plate with high precision

Weixin Liu1, Ming Liu, Shulian Zhang

  • 1The State Key Lab of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China. liuwx04@mails.tsinghua.edu.cn

Applied Optics
|October 22, 2008
PubMed

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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