Complex coordinated functional groups: A great genes for nonlinear optical materials

Wang, Weikang; Mei, Dajiang; Wen, Shaoguo; Wang, Jian; Wu, Yuandong

doi:10.1016/j.cclet.2021.11.089

Cited by 56 publications

(32 citation statements)

References 102 publications

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“…Nonlinear optical (NLO) crystals are widely used in military, industry, optics, and communication fields due to their capacity to realize laser frequency conversion, modulation, Q switching, etc. [1][2][3][4] Until now, one of the most effective strategies for NLO material design is to make use of one or more NLO active units as the functional building motifs (FBMs), such as polyhedral coordinated metal cations causing second-order Jahn-Teller (SOJT) distortions (Ti 4+ , V 5+ , Mo 6+ , etc. ), 5,6 and main group cations (Pb 2+ , Bi 3+ , Te 4+ , I 5+ , etc.)…”

Section: Introductionmentioning

confidence: 99%

Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Wang

Gong

Zhang

et al. 2022

Inorg. Chem. Front.

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Section: Introductionmentioning

confidence: 99%

Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Wang

Gong

Zhang

et al. 2022

Inorg. Chem. Front.

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“…“Doping” and “atom substitute” may be the effective way to achieve this goal. In recent years, by adding some adjacent main group elements to the conventional ternary NLO crystals such as AgGaS 2 , AgGaSe 2 , BaGa 4 S 7 , and LiGaS 2 , , a series of quaternary crystals such as AgGaGe n Q 2( n +1) (Q = S and Se), − BaGa 2 GeQ 6 (Q = S and Se), , Li 2 Ga 2 GeS 6 , , LiGaGe 2 S 6 , , and LiGa(S x Se 1– x ) 2 , have been prepared. Through this process, performance such as the birefringence, laser damage threshold, and NLO coefficient can be adjusted and controlled, and the melting point, band gap, thermal properties, and other physical properties are changed at the same time.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth, Characterization, and Thermal Annealing of Nonlinear Optical Crystals AgGaGe_nSe_2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) for Mid-infrared Applications

et al. 2022

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The new quaternary single crystals AgGaGe n Se 2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) have high nonlinear optical property and can be used for mid-IR laser applications in high power. However, only AgGaGe 3 Se 8 and AgGaGe 5 Se 12 have been grown on a large scale and studied in detail. In this work, the AgGaGe n Se 2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) crystals (Φ 20 mm × 40 mm and Φ 40 mm × 100 mm) were grown by the modified Bridgman method. The crystal structure was studied by X-ray diffraction and the Rietveld refinement method. The composition and morphology were characterized by scanning electron microscopy and metallurgical microscopy. The chemical state and vibration modes of surface elements were characterized by X-ray photoelectron spectroscopy and Raman spectra, and the electrical property was investigated by the Hall effect measurement, which indicates that all the single AgGaGe n Se 2(n+1) crystals are n-type semiconductors. The transmittance of all asgrown AgGaGe n Se 2(n+1) crystal wafers exceed 65% in the transparent range, and the band gap increases from 2.05 eV for AgGaGe 1.5 Se 5 to 2.14 eV for AgGaGe 9 Se 20 . Besides, after being annealed in two different conditions, the wafers show different changes. We discovered a special decomposition phenomenon during the annealing process and found the more appropriate annealing method at last. In addition, the absorption peaks at 4.2, 10, and 14.9 μm of wafers have been nearly eliminated, and the quality of most crystals has been improved.

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“…Infrared lasers have been widely used in the civil and military fields and are generally obtained by converting the frequency of a laser light source from infrared nonlinear optical materials [1][2][3][4][5][6]. With the development of science and technology, infrared nonlinear optical crystal materials have been popularized in the applications.…”

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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Complex coordinated functional groups: A great genes for nonlinear optical materials

Cited by 56 publications

References 102 publications

Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Crystal Growth, Characterization, and Thermal Annealing of Nonlinear Optical Crystals AgGaGe_nSe_2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) for Mid-infrared Applications

AgGaGeSe4: An Infrared Nonlinear Quaternary Selenide with Good Performance

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Complex coordinated functional groups: A great genes for nonlinear optical materials

Cited by 56 publications

References 102 publications

Centrosymmetric Rb[Te2O4(OH)5] and noncentrosymmetric K2[Te3O8(OH)4]: metal tellurates with corner and edge-sharing (Te4O18)12− anion groups

Centrosymmetric Rb[Te2O4(OH)5] and noncentrosymmetric K2[Te3O8(OH)4]: metal tellurates with corner and edge-sharing (Te4O18)12− anion groups

Crystal Growth, Characterization, and Thermal Annealing of Nonlinear Optical Crystals AgGaGenSe2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) for Mid-infrared Applications

AgGaGeSe4: An Infrared Nonlinear Quaternary Selenide with Good Performance

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Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Centrosymmetric Rb[Te₂O₄(OH)₅] and noncentrosymmetric K₂[Te₃O₈(OH)₄]: metal tellurates with corner and edge-sharing (Te₄O₁₈)¹²⁻ anion groups

Crystal Growth, Characterization, and Thermal Annealing of Nonlinear Optical Crystals AgGaGe_nSe_2(n+1) (n = 1.5, 1.75, 2, 3, 4, 5, and 9) for Mid-infrared Applications