A comprehensive survey on nonlinear optical phosphates: Role of multicoordinate groups

Dang, Junhui; Mei, Dajiang; Wu, Yuandong; Lin, Zheshuai

doi:10.1016/j.ccr.2020.213692

Cited by 73 publications

(40 citation statements)

References 94 publications

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“…1–4 As a reliable medium for obtaining ultraviolet (UV) or deep ultraviolet (DUV) light through second harmonic generation (SHG), inorganic borates, phosphates, carbonates, silicates, and other systems have been explored over the past 60 years to different extents based on their various merits. 5–12 Among the above inorganic classes, the subsequent discovery of famous UV/DUV NLO crystals such as LiB 3 O 5 (LBO), 13 CsB 3 O 5 (CBO), 14 KBe 2 BO 3 F 2 (KBBF), 15 and β-BaB 2 O 4 ( β -BBO) 16 turned the inorganic borates into a very appealing system.…”

Section: Introductionmentioning

confidence: 99%

AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

et al. 2022

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Section: Introductionmentioning

confidence: 99%

AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

et al. 2022

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“…Metal phosphates are promising candidates for high-power SHG crystals because of their wide optical transparency with short absorption edges. However, the tetrahedral (PO 4 ) 3– group shows only small structural anisotropy, which usually leads to materials with a small birefringence and non-phase-matchable SHG properties. , Like PO 4 -based compounds, metal germanates and sulfates are also based on less anisotropic (GeO 4 ) 4– or (SO 4 ) 2– tetrahedral units, hence most metal germanates and sulfates display only a weak SHG effect and small birefringence, hampering their practical application in high-powered laser devices. To overcome these problems, highly polarizable cations such as Hg 2+ and Bi 3+ in severely distorted coordination geometries can be introduced into these systems.…”

Section: Combinations Of Highly Distorted Structural Units With Less-...mentioning

confidence: 99%

High-Performance Second-Harmonic-Generation (SHG) Materials: New Developments and New Strategies

et al. 2021

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Metrics & MoreArticle RecommendationsCONSPECTUS: Second-harmonic-generation (SHG) causes the frequency doubling of light, which is very useful for generating high-energy lasers with specific wavelengths. Noncentrosymmetry (NCS) is the first requirement for an SHG process because the SHG coefficient is zero (χ 2 = 0) in all centrosymmetric structures. At this stage, developing novel NCS crystals is a crucial scientific topic. Assembling polar units in an addictive fashion can facilely form NCS crystals with outstanding SHG performance. In this way, our group has obtained many different NCS crystals with extremely large SHG intensities (>5 × KDP or 1 × KTP). In this Account, we first provide a brief review of the development of SHG materials and concisely highlight the features of the excellent SHG materials. Then, we present four facile and rational molecular design strategies: (1) Traditional BO 3 3− -based crystals feature short absorption edges but usually suffer from relatively weak SHG performance (<5 × KDP). The combination of two types of pure π-conjugated anions (BO 3 3− and NO 3 − ) in a parallel fashion in the same compound has afforded a metal borate nitrate with a strong SHG effect. (2) To overcome the problems of the weak SHG effect and small birefringence in the less anisotropic QO 4 -based compounds, highly polarizable cations such as Hg 2+ and Bi 3+ are introduced into these systems, which greatly enhances both SHG effects and birefringence. (3) Iodate anions can be condensed into polynuclear iodate anions with a higher density of I 5+ per unit cell, hence polyiodate anions can serve as excellent SHG-active groups. We developed a novel synthesis method for hydrothermal reactions under a phosphoric acid medium and obtained a series of metal polyiodates with strong SHG effects. In addition, as the number of iodate groups increases, the structural configuration of the polyiodate anion changes from linear to bent. (4) We introduce the concept of aliovalent substitution which features site-to-site atomic displacement at the structural level. Such aliovalent substitution led to new materials that have the same chemical stoichiometries or structural features as their parent compounds. Thus, aliovalent substitution can provide more experimental opportunities and afford new high-performance SHG materials. The introduction of a fluoride anion and the replacement of metal cations in the MO 6 octahedron can result in new metal iodates with balanced properties including a large SHG effect, a wide band gap, and a high laser-induced damage threshold (LIDT) value. Finally, we briefly discuss several problems associated with the studies of SHG materials and give some prospects for SHG materials in the future.

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“…In order to overcome this problem, researchers have carried out a lot of experimental exploration work. Through continuous exploration and research, it is found that the introduction of lighter Group IV Si and Ge elements can effectively enhance their band gap [26][27][28][29][30][31][32][33][34][35][36][37]. For example, the energy band gap of the synthesized Ag 3 Ga 3 SiSe 8 compound is 2.30 eV, which is larger than that of AgGaSe 2 [38].…”

Section: Introductionmentioning

confidence: 99%

AgGaGeSe4: An Infrared Nonlinear Quaternary Selenide with Good Performance

et al. 2022

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The symmetry of crystals is an extremely important property of crystals. Crystals can be divided into centrosymmetric and non-centrosymmetric crystals. In this paper, an infrared (IR) nonlinear optical (NLO) material AgGaGeSe4 was synthesized. The related performance analysis, nonlinear optical properties, and first-principle calculation of AgGaGeSe4 were also introduced in detail. In the AgGaGeSe4 structure, Ge4+ was replaced with Ga3+ and produced the same number of vacancies at the Ag+ position. The low content of Ge doping kept the original chalcopyrite structure and improved its optical properties such as the band gap. The UV-Vis diffuse reflection spectrum shows that the experimental energy band gap of AgGaGeSe4 is 2.27 eV, which is 0.48 eV larger than that of AgGaSe2 (1.79 eV). From the perspective of charge-transfer engineering strategy, the introduction of Group IV Ge elements into the crystal structure of AgGaSe2 effectively improves its band gap. The second harmonic generation (SHG) effect of AgGaGeSe4 is similar to that of AgGaSe2, and at 1064 nm wavelength, the birefringence of AgGaGeSe4 is 0.03, which is greater than that of AgGaSe2 (∆n = 0.02). The results show that AgGaGeSe4 possessed better optical properties than AgGaSe2, and can been broadly applied as a good infrared NLO material.

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A comprehensive survey on nonlinear optical phosphates: Role of multicoordinate groups

Cited by 73 publications

References 94 publications

AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

High-Performance Second-Harmonic-Generation (SHG) Materials: New Developments and New Strategies

AgGaGeSe4: An Infrared Nonlinear Quaternary Selenide with Good Performance

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A comprehensive survey on nonlinear optical phosphates: Role of multicoordinate groups

Cited by 73 publications

References 94 publications

AZn2(BO3)Si2O5 (A = Rb, Cs): first examples of KBe2BO3F2 structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

AZn2(BO3)Si2O5 (A = Rb, Cs): first examples of KBe2BO3F2 structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

High-Performance Second-Harmonic-Generation (SHG) Materials: New Developments and New Strategies

AgGaGeSe4: An Infrared Nonlinear Quaternary Selenide with Good Performance

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AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge

AZn₂(BO₃)Si₂O₅ (A = Rb, Cs): first examples of KBe₂BO₃F₂ structure type in the borosilicate family exhibiting a deep-ultraviolet cutoff edge