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Speckle correlation measurement in a disordered medium observed through second-harmonics generation.

Tetsu Ito1, Makoto Tomita

  • 1Department of Physics, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2004
PubMed
Summary

Researchers studied light scattering in lithium niobate (LiNbO3) crystals. They observed a correlation peak in second-harmonic light intensity, indicating constructive interference between light patterns within the crystal.

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Area of Science:

  • Nonlinear Optics
  • Condensed Matter Physics
  • Photonics

Background:

  • Speckle correlation is crucial for understanding light propagation in disordered media.
  • Lithium niobate (LiNbO3) is a widely used material in nonlinear optics and photonics.
  • Second-harmonic (SH) generation is a key nonlinear optical process.

Purpose of the Study:

  • To investigate speckle correlation in a disordered LiNbO3 medium.
  • To analyze the total intensity of second-harmonic light generated by angularly correlated excitation beams.

Main Methods:

  • Experimental observation of second-harmonic light intensity.
  • Utilizing two angularly correlated excitation beams.
  • Theoretical analysis based on diffusion approximation.

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Main Results:

  • A correlation peak in total SH intensity was observed at approximately zero angle between excitation beams.
  • SH intensity decreased as the angle between excitation beams increased.
  • Experimental results aligned well with theoretical predictions.

Conclusions:

  • The observed correlation peak is attributed to constructive interference between volume speckle patterns.
  • The peak reflects the mutual correlation of speckle patterns generated by the two excitation beams.
  • Diffusion approximation provides a valid theoretical framework for this phenomenon in disordered LiNbO3.