LaBS₃ revisited: a promising mid-infrared nonlinear optical material

Abstract

Thioborates are considered new potential mid-infrared nonlinear optical (NLO) crystals with wide bandgap and large second-harmonic generation (SHG) coefficients. Despite the fact that many rare-earth thioborates are structurally non-centrosymmetric, their...

Zn2BS3Br: An Infrared Nonlinear Optical Material with Significant Dual-Property Enhancements Designed through a Template Grafting Strategy

“…As an emerging IR-NLO system, the planar BS 3 unit with delocalized π-bonds possesses unprecedented advantage by fully integrating the merits of boron and sulfur elements, i.e., favorable IR transparency, wide band gap, large hyperpolarizability and polarizability anisotropy, as well as great fertility of geometries . So, BS 3 is a perfect IR-NLO functional motif and the BS 3 -containing thioborates would be a mine for exploring high-performance IR-NLO materials. − …”

AgIn5Se8: a defect diamond-like non-linear optical selenide

“…13,14 For more than four decades, researchers have focused on exploring new mid-IR NLO materials and hundreds of metal chalcogenides, e.g. , BaGa 4 Se 7 15 and LaBS 3 , 16 have been reported to possess promising NLO properties. However, most of the newly discovered compounds suffer either a weak SHG effect or narrow band gap.…”

“…[10][11][12] To achieve good development of mid-IR lasers, NLO crystals with large second harmonic generation (SHG) responses (SHG coefficient d ij > 10 × d 36 of KH 2 PO 4 , 3.9 pm V −1 ; preferably d ij ∼ d 36 of AgGaS 2 , 13.4 pm V −1 ) as well as wide band gaps (E g > E g of AgGaS 2 , 2.7 eV; preferably E g > 3.0 eV) are needed, but there usually exists an inverse relationship between these two factors. 13,14 For more than four decades, researchers have focused on exploring new mid-IR NLO materials and hundreds of metal chalcogenides, e.g., BaGa 4 Se 7 15 and LaBS 3 , 16 have been reported to possess promising NLO properties. However, most of the newly discovered compounds suffer either a weak SHG effect or narrow band gap.…”

HgB2S4: A d10 Metal Thioborate with Giant Birefringence and Wide Band Gap

“…Chalcogenides are widely regarded as suitable material source for infrared (IR) functional materials − because of their wide IR transparent range, which covers the important IR atmospheric windows, 3–5 and 8–12 μm, like AgGaS 2 (AGS), Li 2 CdGeS 4 , Na 2 ZnGe 2 S 6 , etc. Herein, the thioborate system, as a branch of chalcogenides, has shown similar structure diversity with borates, which have triangles [BS 3 ] and tetrahedra [BS 4 ] as the basic units, and reveal much potential for discovering new functional materials. − At the microscopic scale, theoretical calculations confirmed that both [BS 3 ] and [BS 4 ] groups can obtain a wide IR cutoff edge (>10 μm) . Moreover, the polarization anisotropy of the [BS 3 ] triangle is 7 times larger than that of the [BO 3 ] planar unit, which is beneficial to designing large birefringence materials .…”