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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 13,
  • Issue 11,
  • pp. 112401-
  • (2015)

Determination of the focused beam waist of lasers with weak measurements

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Abstract

In this Letter, a method for detecting the focused beam waist of lasers is proposed by using weak measurements based on the so-called weak-value amplification. We establish a propagation model to describe the quantitative relation between the beam waist and the amplified shift of the spin Hall effect of light (SHEL), which is sensitive to the variation of the beam waist. We experimentally measure the amplified shift corresponding to a different beam waist and the experimental data agrees well with theoretical calculation. These results confirm the rationality and feasibility of our method.

© 2015 Chinese Laser Press

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