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Phase-matched third-harmonic generation in mercury-(I)-chloride.

Heidrun Schmitzer1, Hans-Peter Wagner, Wolfgang Dultz

  • 1TU Chemnitz, Institut für Physik, Germany. heidrun.schmitzer@hrz.tu-chemnitz.de

Applied Optics
|March 22, 2002
PubMed
Summary

Researchers measured the nonlinear optical properties of Hg2Cl2 (Calomel) using third-harmonic generation. Calomel exhibits high effective third-order nonlinear susceptibilities, suggesting its potential for nonlinear optical devices.

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Area of Science:

  • Nonlinear optics
  • Solid-state physics
  • Materials science

Background:

  • Nonlinear optical (NLO) materials are crucial for developing advanced optical devices.
  • Understanding the nonlinear susceptibilities of crystalline materials is essential for their application.
  • Hg2Cl2 (Calomel) is investigated for its potential NLO properties.

Purpose of the Study:

  • To determine the effective third-order nonlinear susceptibilities (χ(3)eff) of Hg2Cl2.
  • To compare the NLO properties of Hg2Cl2 with existing materials like CaCO3 and ADP.
  • To assess the suitability of Hg2Cl2 for nonlinear optical devices.

Main Methods:

  • Phase-matched third-harmonic generation (THG) was employed.
  • Measurements were conducted for type I, type II, and type III phase matching configurations.

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  • Effective nonlinear susceptibilities were calculated based on THG efficiency.

    • Main Results:

    • Effective third-order nonlinear susceptibilities were determined for Hg2Cl2: χ(3)eff,I = 4.5 x 10⁻²² m²/V², χ(3)eff,II = 9.7 x 10⁻²² m²/V², and χ(3)eff,III ≈ 1.5 x 10⁻²² m²/V².
    • The measured susceptibilities of Hg2Cl2 are significantly higher (two orders of magnitude) than those of CaCO3.
    • Specific tensor components of Hg2Cl2 exceed those of ADP by a factor of 5.

    Conclusions:

    • Hg2Cl2 possesses large effective third-order nonlinear susceptibilities.
    • The material's performance in terms of nonlinear optical coefficients is superior to common materials like CaCO3 and ADP.
    • Hg2Cl2 shows significant promise as a material for advanced nonlinear optical devices.