<br>A3Sc（SO4）3 （A = K， Rb， Cs）：三种深紫外透明碱-钪硫酸盐，具有很强的二次谐波产生响应和高热稳定性,Advanced Optical Materials

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A3Sc（SO4）3 （A = K， Rb， Cs）：三种深紫外透明碱-钪硫酸盐，具有很强的二次谐波产生响应和高热稳定性
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2024-07-16 , DOI: 10.1002/adom.202401332
Zilong Geng _{1,

2} , Ruibiao Fu _{1,

2} , Zuju Ma ₃ , Xintao Wu ₁

Affiliation

具有通过频率转换实现可调谐激光器能力的非线性光学（NLO）晶体在固态激光器中非常重要。在此，成功获得了三种具有强二次谐波产生（SHG）响应和高热稳定性的新型深紫外透明碱-硫酸盐 A₃Sc（SO₄）₃ （A = K， Rb， Cs）。有趣的是，略微扭曲的 [ScO₆] 八面体呈有序/定向排列，这有利于 SHG 响应的产生。特别是，K₃Sc（SO₄）₃ 不仅表现出 1.6 × KDP 的强相位匹配 SHG 响应、190 nm 的短深紫外（深紫外）截止边、从深紫外区域到中红外的宽透明窗口覆盖、165 MW ^cm-2 的高激光诱导损伤阈值和大单晶的易生长，而且在空气气氛下仍具有高达 900 °C 的热稳定性。晶体结构和理论计算表明，它们的强 SHG 响应主要源于略微扭曲的 [ScO₆] 八面体。本研究强调 A₃Sc（SO₄）₃ （A = K， Rb， Cs）是有前途的深紫外透明 NLO 晶体，并为追求高性能 NLO 晶体提供了一种新方法。

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A3Sc(SO4)3 (A = K, Rb, Cs): Three Deep-Ultraviolet Transparent Alkali-Scandium Sulfates with Strong Second-Harmonic Generation Response and High Thermal Stability

Nonlinear optical (NLO) crystals that have the capability of achieving tunable lasers through frequency conversion are of great importance in solid-state lasers. Herein, three new deep-UV transparent alkali-scandium sulfates with strong second-harmonic generation (SHG) response and high thermal stability, A₃Sc(SO₄)₃ (A = K, Rb, Cs), are successfully obtained. It is interesting that the slightly distorted [ScO₆] octahedrons are in an ordered/oriented arrangement, which is in favor of the generation of SHG response. Especially, K₃Sc(SO₄)₃ not only exhibits a strong phase-matching SHG response of 1.6 × KDP, a short deep-ultraviolet (deep-UV) cutoff edge of 190 nm, a wide transparent window covering from the deep-UV region to mid IR, a high laser-induced damage threshold of 165 MW cm⁻² and easy growth of large single crystal, but also behaves thermal stable up to 900 °C under an air atmosphere. Crystal structures and theoretical calculations reveal that their strong SHG responses mainly stem from the slightly distorted [ScO₆] octahedron. This study highlights A₃Sc(SO₄)₃ (A = K, Rb, Cs) as promising deep-UV transparent NLO crystals and offers a new approach for the pursuit of high-performance NLO crystals.

更新日期：2024-07-16

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