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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

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Published on: February 4, 2017

Radially polarized annular beam generated through a second-harmonic-generation process.

Shunichi Sato1, Yuichi Kozawa

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1,Sendai 980-8577, Japan. sato@tagen.tohoku.ac.jp

Optics Letters
|October 20, 2009
PubMed
Summary
This summary is machine-generated.

Researchers generated a radially polarized beam with a narrow annular intensity pattern using a beta-barium borate (BBO) crystal. This process, involving second-harmonic generation, resulted in a beam with nearly sixfold symmetry.

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Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Materials Science

Background:

  • Radially polarized beams offer unique properties for applications in microscopy and particle acceleration.
  • Generating radially polarized beams with specific intensity profiles, such as annular patterns, is crucial for advanced optical techniques.

Purpose of the Study:

  • To generate a radially polarized beam with a distinct annular intensity pattern.
  • To investigate the second-harmonic-generation (SHG) process in beta-barium borate (BBO) crystals for beam shaping.
  • To analyze the symmetry and dimensions of the generated annular beam.

Main Methods:

  • Utilized a Ti:sapphire pulsed laser with azimuthal polarization.
  • Focused the laser beam onto a c-cut beta-barium borate (BBO) crystal to induce second-harmonic generation.
  • Analyzed the intensity pattern and symmetry of the generated second-harmonic wave.

Main Results:

  • Successfully generated a radially polarized beam with an annular intensity pattern.
  • Observed a nearly sixfold symmetry in the annular pattern, attributed to the nonlinear susceptibility tensor of the BBO crystal.
  • Achieved a narrow annulus with a width less than 1/40th of its radius.

Conclusions:

  • Second-harmonic generation in BBO crystals is an effective method for producing radially polarized beams with specific annular intensity profiles.
  • The nonlinear properties of BBO crystals dictate the symmetry of the generated beam.
  • The demonstrated technique allows for the creation of high-quality annular beams with precise dimensions.