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Brewster cross polarization.

A Aiello1, M Merano, J P Woerdman

  • 1Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands. aiello@molphys.leidenuniv.nl

Optics Letters
|April 17, 2009
PubMed
Summary
This summary is machine-generated.

We studied the polarization of light reflected at a Brewster angle. The reflected light has two polarization components, with the cross-polarized component

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Area of Science:

  • Optics and Photonics
  • Electromagnetism
  • Quantum Optics

Background:

  • Reflection of light at interfaces is fundamental in optics.
  • Brewster incidence offers unique polarization properties for TM-polarized light.
  • Gaussian beams are standard models for laser light propagation.

Purpose of the Study:

  • To theoretically derive the polarization-resolved intensity distribution of a reflected Gaussian beam at Brewster incidence.
  • To analyze the spatial modes and power distribution of the reflected beam's polarization components.
  • To experimentally validate the theoretical predictions.

Main Methods:

  • Theoretical derivation using electromagnetic wave theory.
  • Analysis of polarization components (TM and TE modes).
  • Calculation of intensity distribution and spatial mode analysis (Hermite-Gaussian modes).
  • Experimental verification of theoretical results.

Main Results:

  • The reflected beam consists of a dominant TM-polarized component (TEM(10) mode) and a cross-polarized TM component (TEM(01) mode).
  • The power of the TE-polarized mode scales quadratically with the incident beam's angular spread.
  • The TE-mode power is found to be comparable to the TM-mode power.

Conclusions:

  • The cross-polarization generated upon reflection of a Gaussian beam at Brewster incidence is significant.
  • The angular spread of the incident beam plays a crucial role in determining the TE-mode power.
  • Experimental results confirm the theoretical predictions, validating the model for reflected Gaussian beam polarization.