Current Optics and Photonics

Optical Society of Korea (한국광학회)
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A New Method for Measuring Refractive Index with a Laser Frequency-shifted Feedback Confocal Microscope

  • Zhou, Borui (Department of Electronic and Optical Engineering, Army Engineering University of PLA) ;
  • Wang, Zihan (College of Science, Beijing Forestry University) ;
  • Shen, Xueju (Department of Electronic and Optical Engineering, Army Engineering University of PLA)
  • Received : 2019.09.25
  • Accepted : 2019.11.01
  • Published : 2020.02.25
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Abstract

In this paper, a new method is presented to measure the refractive index of single plain glass or multilayered materials, based on a laser frequency-shifted confocal feedback microscope. Combining the laser frequency-shifted feedback technique and the confocal effect, the method can attain high axial-positioning accuracy, stability and sensitivity. Measurements of different samples are given, including N-BK7 glass, Silica plain glass, and a microfluidic chip with four layers. The results for N-BK7 glass and Silica plain glass show that the measurement uncertainty in the refractive index is better than 0.001. Meanwhile, the feasibility of this method for multilayered materials is tested. Compared to conventional methods, this system is more compact and has less difficulty in sample processing, and thus is promising for applications in the area of refractive-index measurement.

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References

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