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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

Polarization modulation time-domain terahertz polarimetry.

C M Morris1, R Valdés Aguilar, A V Stier

  • 1Department of Physics and Astronomy, The Johns Hopkins University, 3400 N Charles St, Baltimore, Maryland 21218, USA.

Optics Express
|June 21, 2012
PubMed
Summary

This study introduces a high-precision polarization modulation technique for terahertz (THz) measurements. The method accurately characterizes elliptical polarization across a wide frequency range.

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Area of Science:

  • Terahertz (THz) spectroscopy and optics
  • Metrology and precision measurement

Background:

  • Accurate characterization of polarization states is crucial for THz applications.
  • Existing techniques may lack precision or cover limited frequency ranges.

Purpose of the Study:

  • To develop and validate a high-precision polarization modulation technique for measuring polarization rotations.
  • To achieve accurate characterization of elliptical polarization in the 0.1 to 2.5 THz range.

Main Methods:

  • Utilizing a polarization modulation technique with a motorized rotating polarizer (~ 80 Hz).
  • Employing a lock-in detection method for precise measurement of polarization modulation.
  • Developing a detailed mathematical framework for data analysis.

Main Results:

  • Achieved high accuracy (0.050°, 900 μrad) and precision (0.02°, 350 μrad) for small polarization rotation angles.
  • Demonstrated the capability to fully characterize elliptical polarizations.
  • Validated measurements across the 0.1 to 2.5 THz frequency spectrum.

Conclusions:

  • The presented polarization modulation technique offers superior precision for THz polarization measurements.
  • This method provides a robust tool for characterizing complex polarization states in the THz domain.
  • The technique is applicable for a broad range of scientific and technological applications in the THz frequency range.