CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Xianglin Li,Shenglai Wang,Bo Wang,Hui Liu,Tianci Wu,Kaiyu Wang,Shuai Wang,Yanhong Li,Taixin Zhang,Xiaoyang Dai
The effect of Na3(PO3)3 on the growth of KDP crystal (101) faces was studied by the Michelson interference technique and atomic force microscopy. The experimental results show that the growth rates were near zero at low supersaturation when Na3(PO3)3 was doped into solution, i.e., there was a supersaturation interval similar to the “growth dead zone”. The growth rates began to increase rapidly as the supersaturation crossed the “growth dead zone” and continued to increase. The “growth dead zone” increased as the doping concentration was increased. In addition, the anisotropy of growth hillocks decreased and the competition of growth hillocks became more intense when the doping concentration of Na3(PO3)3 was gradually increased in solution at confirmed supersaturation. The calculated surface free energies of three adjacent planes show that they increased with the increase of doping concentration and always αI, αII > αIII.
研究领域:
晶体学
·
材料科学
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产品关联
DOI
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-11
·
IF 4.6
You Teng-Hui,Yang Wei,Hui Hao-Hao,Lei Xiang-Yang,Wang Tian-Yu,Zhang Qing-Hua,Ju Xin,Deng Xue-Ran
The purpose of this study is to analyze the damage of antireflective (AR) coating over potassium dihydrogen phosphate (KDP) crystal subjected to multi-pulse laser irradiation at low flux under vacuum. Fresh silica AR was characterized as a reference; Atomic Force Microscope (AFM), Scanning Electron Microscopy (SEM), profilometer, and Scanning Near-Field Optical Microscope Photo-induced Force Microscope (SNOM-PiFM) were employed to analyze the characteristics of coatings. The experimental results indicated that the damage of AR coating over the KDP crystal was mainly caused by partial exfoliation, which exposed silica particles beneath the surface. It was found that the accumulated tensile stress led to coating damage with the increase of laser pulse. The initial coating damage was observed to extend and interconnect to form large-area exfoliation. Splitting mechanism of SiO–Si TO 3 was observed at vibration mode peaks of 1064 cm −1 and 1096 cm −1 showing progressing irradiation damage. Based on this study, it would be helpful to suppress the damage probability of AR coating over KDP crystal applied in high-power laser systems. Moreover, the applicability of SNOM-PiFM method to study the Infrared Radiation (IR) spectra of ultra-thin coatings with transparent substrates was proposed.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 10
·1744
·
IF 5.1
Fugui Cai,Jie Ren,Yuqing Yao,Hanying Li
Using the gel-grown method to control the morphology of crystals attracts extensive attention. Potassium dihydrogen phosphate (KDP) is a nonlinear optical crystal with a high laser damage threshold. Here, we studied the crystallization of KDP in silica gel. The kebab-like KDP crystals (multiple KDP crystals aligning along a straight line) were prepared in the silica gel. In situ observation revealed that the kebab-like crystals were obtained through secondary nucleations on preformed needle-like crystals. Further investigation revealed that the hydroxyl groups on the gel network have an important influence on the formation of kebab-like KDP crystals. The hydroxyl groups on the gel networks can form hydrogen bonds with the phosphoric acid group of the KDP crystal and hinder the growth of the prismatic KDP faces, which leads to the preformation of needle-like crystals. Additionally, the influence of the acetic acid concentration and antisolvent on morphology was also studied.
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DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 4
·1233-1241
·
IF 2.339
Wang Tian-Yu,Yang Wei,Hui Hao-Hao,Lei Xiang-Yang,Zhang Qing-Hua,Wang Jian,Xu Qiao,Deng Xue-Ran
The sol–gel method is an important process for the preparation of laser frequency conversion components, such as dihydrogen phosphate (KDP), which are often employed in high-power laser facility. Methyltriethoxysilane (MTS) precursor is a typical matrix to prepare polysiloxane under hydrolysis and polycondensation process. Further coating and curing procedure is applied to obtain desired polysiloxane coating which acts as the moisture-proof and refractive index matching layer. Subsequently, an antireflective coating is prepared over this polysiloxane coating (a bilayer coating system) to realize ultrahigh transmission at desired wavelengths. Due to the low curing temperature (limited by the phase transition temperature of KDP), current MTS-polysiloxane coating could not be completely cured and inter-coating permeation between this bilayer coating system would lead to deterioration of coating properties. Thus, copolymerization of MTS and tetraethylorthosilicate (TEOS) is adopted to fabricate the polysiloxane coating with improved curing property (denser structure and higher hardness after curing). It is found that under certain molar ratio of MTS to TEOS, the structure of modified polysiloxane coating could be effectively densified and the coating hardness increases significantly. Meanwhile, the bilayer coating system still exhibits excellent transmission, high laser-induced damage threshold as well as satisfactory moisture resistance.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Ji Fang,Xu Min,Wang Chao,Li Xiaoyuan,Gao Wei,Zhang Yunfei,Wang Baorui,Tang Guangping,Yue Xiaobin
The cubic Fe 3 O 4 nanoparticles with sharp horns that display the size distribution between 100 and 200 nm are utilized to substitute the magnetic sensitive medium (carbonyl iron powders, CIPs) and abrasives (CeO 2 /diamond) simultaneously which are widely employed in conventional magnetorheological finishing fluid. The removal rate of this novel fluid is extremely low compared with the value of conventional one even though the spot of the former is much bigger. This surprising phenomenon is generated due to the small size and low saturation magnetization ( M
s ) of Fe 3 O 4 and corresponding weak shear stress under external magnetic field according to material removal rate model of magnetorheological finishing (MRF). Different from conventional D-shaped finishing spot, the low M
s also results in a shuttle-like spot because the magnetic controllability is weak and particles in the fringe of spot are loose. The surface texture as well as figure accuracy and PSD1 (power spectrum density) of potassium dihydrogen phosphate (KDP) is greatly improved after MRF, which clearly prove the feasibility of substituting CIP and abrasive with Fe 3 O 4 in our novel MRF design.
研究领域:
材料科学
·
光学工程
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Min Chen,Zhengli Liang,Xiaoxiao Wang,Jiehua Li,Xingguo Chen,Xingxing Jiang,Zheshuai Lin,Zhen Ma,Hongming Liu
A series of lanthanide-containing water-resistant nitrates, namely RE(OH)2NO3 (RE = Tb(1), Dy(2), Ho(3), and Er(4)), was obtained through the hydrothermal process. As possible nonlinear optical materials, they feature a layered isomorph composed of an [REO3(OH)6] polyhedron and an [NO3] triangle, and the synergistic arrangement of the [REO3(OH)6] and [NO3] groups in their structures leads to their obvious second-order nonlinear optical effect. Nevertheless, the unique optical absorption caused by the electronic transitions on 4f–4f orbitals of lanthanides results in their second harmonic generation responses of different strengths, with 1 exhibiting 5.07 times that of KDP, but 2–4 showing less than half of KDP. In addition, 1 possesses an outstanding water-resistant capacity and a transparent cut-off edge around 300 nm, foreshadowing its potential value as a nonlinear optical crystal. Moreover, 1 is found to emit characteristic green fluorescence due to the typical 5D4 → 7F5 transitions of the excited Tb3+ ions
研究领域:
材料科学
·
光学
·
化学
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产品关联
DOI
PubMed
高影响因子
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