The novel diamond-like Li₄CdSn₂S₇ possesses many outstanding attributes that enable it to be a new, well-rounded front-runner among infrared (IR) nonlinear-optical materials, especially for high-intensity laser applications. Distortions of the metal–sulfur tetrahedra in accordance with Pauling’s second rule give rise to a significant net dipole moment, resulting in a strong second-order nonlinear optical susceptibility (χ⁽²⁾) of 35.0 ± 3.5 pm/V. Li₄CdSn₂S₇ possesses an optical bandgap of 2.59 eV and an exceptional laser-induced damage threshold of >2.5 GW/cm², which is more than 12.5 times greater than that of AgGaSe₂ measured under identical irradiation conditions. Li₄CdSn₂S₇ possesses a melting point of ∼780 °C and phase-matchability. All data indicate that Li₄CdSn₂S₇ will outperform AgGaS₂ and AgGaSe₂ in difference frequency generation schemes for the generation of mid-IR radiation. New information on the recently reported Li₂CdSiS₄, which Li₄CdSn₂S₇ also outperforms, is additionally included.

中文翻译：

---

双轴，四级类金刚石半导体中的相位匹配，强倍频和出色的激光诱导损伤阈值Li ₄ CdSn ₂ S ₇

新型的类金刚石Li ₄ CdSn ₂ S ₇具有许多出色的特性，使其成为红外（IR）非线性光学材料中新的，全面的领先者，尤其是在高强度激光应用中。根据鲍林第二定律，金属-硫四面体的畸变会引起显着的净偶极矩，从而导致35.0±3.5 pm / V的强二阶非线性光学磁化率（χ ^（2））。李₄ CDSN ₂小号₇具有2.59电子伏特的光学带隙和> 2.5 GW / cm的特殊激光诱导损伤阈值²，其比AgGaSe的大超过12.5倍₂在相同的照射条件下测量。Li ₄ CdSn ₂ S ₇具有〜780°C的熔点和相匹配性。所有的数据表明，栗₄ CDSN ₂小号₇将超越AgGaS ₂和AgGaSe ₂在差频生成方案为中红外辐射的产生。此外，还包括有关最近报道的Li ₂ CdSiS _4的新信息，Li ₄ CdSn ₂ S _7的性能也胜过其他。