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Highly efficient infrared optical nonlinearity of a wide-bandgap chalcogenide Li_2CdGeS_4

机译:宽禁带硫族化物的高效红外光学非线性Li_2CdGeS_4

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摘要

A quaternary chalcogenide Li_2CdGeS_4 is an excellent candidate for a nonlinear optical (NLO) material exhibiting wide transparency spanning from its fundamental band edge (3.15 eV) to the terahertz regime (23.5 μm). Strong optical nonlinearity of Li_2CdGeS_4 has been investigated over a wide spectral range (λ = 1.064-3.3 μm) based on second- and third-harmonic generation. The compound has a high damage threshold at λ = 1.064 μm because of saturable three-photon absorption, and is phase-matchable for λ > 1.5 μm with χ~(2) approx- 50 pm/V. It also exhibits strong third-order nonlinearity of χ~(3) approx- 10~5 pm~2/V~2. Li_2CdGeS_4 is promising for high-power NLO applications in the broad infrared spectrum.
机译:季硫族化物Li_2CdGeS_4是非线性光学 (NLO) 材料的绝佳候选者,其表现出从其基本带边缘 (3.15 eV) 到太赫兹范围 (23.5 μm) 的宽透明度。基于二次谐波和三次谐波的产生,研究了Li_2CdGeS_4在宽光谱范围(λ = 1.064-3.3 μm)上的强光学非线性。由于可饱和的三光子吸收,该化合物在 λ = 1.064 μm 处具有较高的损伤阈值,并且在 λ > 1.5 μm 时,χ~(2) 约为 50 pm/V。它还表现出χ~(3)的强三阶非线性,约为10~5 pm~2/V~2。Li_2CdGeS_4在广红外光谱中的高功率NLO应用方面很有前途。

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  • 来源
    《Optics Letters》 |2014年第15期|4579-4582|共4页
  • 作者单位

    Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, Pennsylvania 15282, USA;

    Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, USA;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 计量学;
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