Alkali metal partial substitution-induced improved second-harmonic generation and enhanced laser-induced damage threshold for Ag-based sulfides

Abstract

Nonlinear optical (NLO) materials in the middle infrared (IR) region play an important role in outputting IR laser, however, their applications are restricted by the imbalance between large second-harmonic generation...

Rb2CdSi4S10: novel [Si4S10] T2-supertetrahedra-contained infrared nonlinear optical material with large band gap

“…[29][30][31][32] In general, to obtain a wide E g , the introduction of an alkali and/or alkali-earth metals (AAEMs, which are free of d-d or f-f electronic transitions), and/or halogen elements with strong electronegativities into sulfides have been regarded as feasible strategies. [33][34][35][36][37] Whereas to create a large SHG response in sulfide, the [MS 4 ] (M = d 10 metals, IIIA, IVA and VA group elements) tetrahedra with strong covalent bonds could be used as the NLO-active units. [38][39][40][41] In addition, to achieve the desired balance between the wide E g and the large SHG response, the atomic coordination of AAEMs, unit-arrangement and the density of the NLO units should be carefully designed.…”

Ag[SC(NH2)2]2F: A Laser Damage-Tolerant Infrared Nonlinear Optical Material

“…Compared with some representative chalcogenides based on tetrahedra, Ag[SC(NH 2 ) 2 ] 2 F has a significant wider band gap and higher LIDT while maintaining a large SHG response in the near-IR region (Figure a). a, ,,,− In addition, compared with the reported thiourea compounds, the SHG response of Ag[SC(NH 2 ) 2 ] 2 F at 1064 nm is significantly increased while maintaining a wide band gap (Figure b). a, , Noteworthily, the band gap and NLO property of Ag[SC(NH 2 ) 2 ] 2 F are also comparable with those of other excellent UV NLO crystals such as LiHgPO 4 (4.03 eV, 11 × KDP), [ o -C 5 H 4 NHOH] 2 [I 7 O 18 (OH)]·3H 2 O (3.90 eV, 8.5 × KDP), and Pb 3 Mg 3 TeP 2 O 14 (4.5 eV, 13.5 × KDP) …”

“…SHG at 2.05 μm and LIDT diagram for Ag­[SC­(NH 2 ) 2 ] 2 F along with other representative chalcogenides based on tetrahedra a, ,,,− (a) and SHG at 1064 nm and band gap diagram for Ag­[SC­(NH 2 ) 2 ] 2 F along with some NLO thiourea crystals a, , (b). ( a This work).…”

Three-in-One Tetrahedral Functional Units Constructing Diamondlike Ag2In2SiS3.06Se2.94 with High-Performance Nonlinear-Optical Activity

“…In order to explore potential metal-chalcogenide IR NLO materials, an extensive survey has been performed, and the A 2 M III 2 M IV Q 6 (A = alkali or coin metal; M III = Ga, In; M IV = Si, Ge, Sn; Q = S, Se) family of compounds and related ones have attracted our attention in recent years. , Although about 20 members have been discovered, it is undeniable that they typically exhibit large NLO effects and extremely high LIDTs (Table S1). Our previous works have successfully obtained Ag 2 In 2 GeS 6 , (LiAg)­In 2 GeS 6 , (NaAg)­In 2 GeS 6 , and Ag 2 In 2 SiS 6 ( 0 ) in this family. 0 has a suitable optical band gap (2.41 eV), a large LIDT (3.8 × AGS), and a moderate SHG response (0.3 × AGS).…”