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Abstract <p>Three components of the refractive index and absorption coefficient of a nonlinear crystal RbTiOPO<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({}_{4}\)</EquationSource> <!--OptelIns2570058Rybak-m3--> </InlineEquation> (RTP) were measured by terahertz time-domain spectroscopy in the range of 0.2–1.6 THz at room temperature. The values of the refractive indices in the low-frequency region are close to those of the KTiOPO<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({}_{4}\)</EquationSource> <!--OptelIns2570058Rybak-m4--> </InlineEquation> crystal. However, RTP demonstrates higher absorption, in particular at frequencies above 1.5 THz. The Sellmeier equations describing the dispersion of the refractive index in the studied range are proposed. The fulfillment of collinear phase-matching conditions in the <i>XZ</i> principal plane is shown for the difference terahertz frequency generation from near-infrared lasers.</p>

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Optical Properties of the RbTiOPO\({}_{\mathbf{4}}\) Crystal in the Terahertz Range

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • A. A. Rybak,
  • G. V. Lansky,
  • V. D. Antsygin,
  • Yu. M. Andreev,
  • N. A. Nikolaev

摘要

Abstract

Three components of the refractive index and absorption coefficient of a nonlinear crystal RbTiOPO \({}_{4}\) (RTP) were measured by terahertz time-domain spectroscopy in the range of 0.2–1.6 THz at room temperature. The values of the refractive indices in the low-frequency region are close to those of the KTiOPO \({}_{4}\) crystal. However, RTP demonstrates higher absorption, in particular at frequencies above 1.5 THz. The Sellmeier equations describing the dispersion of the refractive index in the studied range are proposed. The fulfillment of collinear phase-matching conditions in the XZ principal plane is shown for the difference terahertz frequency generation from near-infrared lasers.