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Related Concept Videos

Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Published on: February 28, 2016

Autocalibrating Stokes polarimeter for materials characterization.

Masaya Shinki1, Mario T Ivanov, Joshua S Post

  • 1School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada.

Applied Optics
|June 23, 2012
PubMed
Summary
This summary is machine-generated.

A new ellipsometer design using a rotating-retarder Stokes polarimeter is presented. This automated system simplifies calibration, enabling accurate measurements of optical properties like refractive index and thickness.

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Area of Science:

  • Optical Physics
  • Instrumentation Science

Background:

  • Ellipsometry is a powerful technique for characterizing thin films and surfaces.
  • Traditional ellipsometer calibration can be complex and time-consuming.
  • Automated calibration methods are needed to improve efficiency and accuracy.

Purpose of the Study:

  • To describe the design and construction of a novel ellipsometer.
  • To introduce an automated calibration scheme for the ellipsometer.
  • To demonstrate the ellipsometer's capability in determining optical properties.

Main Methods:

  • The ellipsometer utilizes a fixed-wavelength rotating-retarder Stokes polarimeter.
  • An automated calibration scheme was developed, eliminating the need for known calibration samples.
  • Lock-in amplifier phases and signal amplitudes are calibrated using raw data.

Main Results:

  • The automated calibration successfully sets lock-in amplifier phases without reference samples.
  • Relative signal amplitudes are calibrated effectively using the developed method.
  • The refractive index and thickness of a glass cover slide were accurately determined across various incident angles.

Conclusions:

  • The developed ellipsometer with automated calibration offers a simplified and efficient approach to optical characterization.
  • This method enhances the accessibility and accuracy of ellipsometric measurements.
  • The system is suitable for determining optical constants and film thicknesses.