Optical Materials最新文献

英文中文

Optical sensing and nonlinear optical properties of Cr-doped MoO3/PEDOT:PSS Nanocomposites 掺杂铬的 MoO3/PEDOT:PSS 纳米复合材料的光传感和非线性光学特性

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116268

Karthikeyan Balasubramanian, Abhishek Kumar Choudhary, K. Arjun, Anjali Sharma

In this study, we observed a negative UV photoresponse that switched to a positive photoresponse in Cr-doped MoO₃/PEDOT:PSS nanocomposite films(NCF) prepared via drop-casting. MoO₃ and Cr-doped MoO₃ were synthesized using a hot oil bath co-precipitation method, combined with PEDOT:PSS (poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate)), and coated onto flexible OHP sheets. The open aperture z-scan method investigated the nonlinear optical properties of NCF on the glass substrate. The films were characterized by X-ray diffraction, scanning electron microscopic (SEM), UV–Vis spectroscopy, and Fourier Transformed Infrared (FTIR). Chromium doping caused minor changes in lattice parameters, crystalline size, and microstrain. UV spectroscopy revealed an increase in bandgap with higher Cr–MoO₃ concentrations. The photoresponse of different Cr–MoO₃ concentrations showed an initial current decrease under UV light, but the photoresponse became positive beyond a threshold and continued to improve. Nonlinear optical studies indicated saturable absorption in the nanocomposite. This work enhances our understanding of Cr-doped MoO₃/PEDOT:PSS nanocomposites, contributing to advancements in flexible UV photodetectors and nonlinear optical applications.

在这项研究中，我们观察到通过滴铸法制备的掺杂铬的 MoO3/PEDOT:PSS 纳米复合薄膜（NCF）的负紫外光响应转变为正紫外光响应。MoO3 和掺杂铬的 MoO3 采用热油浴共沉淀法合成，与 PEDOT:PSS（掺杂聚（4-苯乙烯磺酸）的聚（3,4-亚乙二氧基噻吩）结合，并涂布到柔性 OHP 薄膜上。开孔 Z 扫描法研究了玻璃基底上 NCF 的非线性光学特性。通过 X 射线衍射、扫描电子显微镜 (SEM)、紫外可见光谱和傅立叶变换红外 (FTIR) 对薄膜进行了表征。铬掺杂导致晶格参数、结晶尺寸和微应变发生微小变化。紫外光谱显示，随着 Cr-MoO3 浓度的增加，带隙也随之增加。不同浓度的 Cr-MoO3 的光响应在紫外光下显示出初始电流下降，但超过阈值后光响应变为正值并持续改善。非线性光学研究表明，纳米复合材料中存在可饱和吸收。这项研究加深了我们对掺杂铬的 MoO3/PEDOT:PSS 纳米复合材料的理解，有助于推动柔性紫外光检测器和非线性光学应用的发展。

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引用次数: 0

Versatile photoluminescence behavior of polycyclic hydroxybenzimidazoles driven by intermolecular hydrogen bonding 分子间氢键驱动多环羟基苯并咪唑的多种光致发光行为

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116274

Dancho Yordanov , Rastislav Smolka , Martin Vala , Martin Weiter , Anton Georgiev

Herein, the synthesis of polycyclic hydroxybenzimidazole based on 4-hydroxyphthalimide is presented and two isomeric structures are formed. The isomeric structures are capable of forming intermolecular hydrogen-bonded molecular associates. Hydroxybenzimidazole hydrogen-bonded organic frameworks have been shown to be sensitive to different solvent polarity, particularly in proton donor media, resulting in a blue shift in emission. The role of proton donor media has been evaluated using the binary mixture of acetonitrile/water and protonation by trifluoroacetic acid. The results show that by tuning the environment, the aggregation induced emission has appeared in the blue region and larger aggregates are formed compared to the less polar aprotic solvents. Under acidic conditions, the disruption of the hydrogen-bonded dimers was estimated, resulting in deep blue emission. This provides an opportunity to control the molecular associates and tune the optical behavior.

本文介绍了基于 4-羟基邻苯二甲酰亚胺的多环羟基苯并咪唑的合成，并形成了两种异构体结构。异构体结构能够形成分子间氢键分子缔合物。研究表明，羟基苯并咪唑氢键有机框架对不同的溶剂极性非常敏感，特别是在质子供体介质中，从而导致发射蓝移。利用乙腈/水的二元混合物和三氟乙酸质子化，对质子供体介质的作用进行了评估。结果表明，通过调整环境，聚集诱导的发射出现在蓝色区域，并且与极性较弱的非沸腾溶剂相比，形成了更大的聚集体。据估计，在酸性条件下，氢键二聚体会被破坏，从而产生深蓝色发射。这为控制分子关联和调整光学行为提供了机会。

引用次数: 0

Up-conversion thermometry based on Tm3+/Yb3+ co-doped Ba5Gd8Zn4O21 phosphors 基于 Tm3+/Yb3+ 共掺杂 Ba5Gd8Zn4O21 荧光粉的上转换温度计

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116271

Hengwei Zhou , Xiaoying Liang , LiLi Zhang , Fangfang Hu , Hai Guo

Optical thermometry based on fluorescence intensity ratio of rare earth ions has attracted widespread attention due to its non-contact, fast response time, immune to interference and high sensitivity. In this study, we developed Tm³⁺/Yb³⁺ doped Ba₅Gd₈Zn₄O₂₁ phosphors for temperature sensing purposes. The structure, morphology and luminescent performances of these phosphors were comprehensively explored using X-ray diffraction, scanning electron microscopy and photoluminescence techniques. Furthermore, we explored the temperature-dependent fluorescence intensity ratio of Tm³⁺ (¹G₄ → ³H₆ and ³F₂ → ³H₆) with a temperature range of 303–573 K. Our results demonstrate excellent relative sensitivity and resolution for high-temperature sensing applications (S_R = 1.94 % K⁻¹, ΔT = 0.61 K). Overall, our findings highlight the promising potential of BGZO:Tm³⁺/Yb³⁺ phosphors in optical thermometry sensing.

基于稀土离子荧光强度比的光学测温因其非接触、响应速度快、抗干扰性强和灵敏度高而受到广泛关注。本研究开发了掺杂 Tm3+/Yb3+ 的 Ba5Gd8Zn4O21 荧光粉，用于温度传感。我们利用 X 射线衍射、扫描电子显微镜和光致发光技术对这些荧光粉的结构、形态和发光性能进行了全面的研究。此外，我们还探索了温度范围为 303-573 K 的 Tm3+ （1G4 → 3H6 和 3F2 → 3H6）随温度变化的荧光强度比。总之，我们的研究结果凸显了 BGZO:Tm3+/Yb3+ 荧光粉在光学测温传感方面的巨大潜力。

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引用次数: 0

Analysis of the reasons for the enhanced green luminescence of Mg2+-doped Zn2SiO4:Mn2+ phosphor 掺杂 Mg2+ 的 Zn2SiO4:Mn2+ 荧光粉绿色发光增强的原因分析

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116261

Irina V. Ivanova, Tatiana I. Krasnenko

In the present work, the role of the optically inactive co-dopant magnesium in increasing the emission intensity of Zn₂SiO₄:Mn²⁺ has been established. It is shown that the dominant reasons for the increase in green luminescence intensity are the enhancement in the prohibition of the ⁴T₂(⁴G) → ⁶A₁(⁶S) transition and the decrease in non-radiative dissipation of absorbed excitation energy upon the introduction of Mg²⁺ ions.

在本研究中，我们确定了光学上不活跃的共掺杂剂镁在提高 Zn2SiO4:Mn2+ 发射强度方面的作用。研究表明，绿色发光强度增加的主要原因是在引入 Mg2+ 离子后，禁止 4T2(4G)→6A1(6S)转变的作用增强，以及吸收的激发能量的非辐射耗散减少。

引用次数: 0

Preparation of fly ash zeolite supported ZnO/Co3O4 catalyst for the photocatalytic degradation of xanthate under visible light 制备粉煤灰沸石支撑的 ZnO/Co3O4 催化剂，用于在可见光下光催化降解黄原酸盐

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116262

Junxiang Wang , Qianqian Song , Xindong Zhou , Ruoyun Li , Qingming He , Jingang Wang , Hui Yang , Haodong Duan , Lin Li

The development of high-value utilization technology of fly ash plays an important role in promoting environmental protection and social and economic development. In this paper, a novel composite photocatalyst Z-ZnO/Co₃O₄ is synthesized by loading ZnO/Co₃O₄ on the surface of fly ash zeolite. In addition, the properties of Z-ZnO/Co₃O₄ are characterized by variety of methods. The results show that the surface of cubic A-type zeolite is coated with ZnO/Co₃O₄ composite, forming an open spherical flower-like structure with a typical p-n heterostructure, which plays a positive role in reducing the band gap and the recombination rate of photogenerated electrons and holes of the composite catalyst, thus improving the degradation efficiency of xanthate. The degradation rate toward xanthate of Z-ZnO/Co₃O₄ is 97.62 % after simulated sunlight irradiation for 120 min under the optimum conditions, which is higher than that of Z-ZnO and Z-Co₃O₄, respectively. Meanwhile, the experimental results indicate that h⁺ plays a leading role in the catalytic reaction system. Furthermore, degradation rate toward xanthate of Z-ZnO/Co₃O₄ decreases slightly from 97.62 % to 88.24 % after five cycles, indicating its remarkable durability and stability.

粉煤灰高值化利用技术的开发对促进环境保护和社会经济发展具有重要作用。本文通过在粉煤灰沸石表面负载 ZnO/Co3O4 合成了一种新型复合光催化剂 Z-ZnO/Co3O4。此外，还采用多种方法对 Z-ZnO/Co3O4 的性质进行了表征。结果表明，立方A型沸石表面包覆ZnO/Co3O4复合材料后，形成了开放的球花状结构，具有典型的p-n异质结构，这对降低复合催化剂的带隙和光生电子与空穴的重组率起到了积极作用，从而提高了黄原酸盐的降解效率。在最佳条件下，Z-ZnO/Co3O4在模拟太阳光照射120分钟后对黄原酸盐的降解率为97.62%，分别高于Z-ZnO和Z-Co3O4。同时，实验结果表明，h+ 在催化反应体系中起主导作用。此外，Z-ZnO/Co3O4 对黄原酸盐的降解率在五个循环后从 97.62% 微降至 88.24%，表明其具有显著的耐久性和稳定性。

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引用次数: 0

Chromatic tuning of upconversion emission upon dual infrared wavelength co-excitation in Er3+ doped Ba3Lu4O9 phosphor 掺杂 Er3+ 的 Ba3Lu4O9 荧光粉在双红外波长共激发时的上转换发射色度调整

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116266

Xin Chen, Xuezhu Sha, Li Wang, Jinsu Zhang, Xizhen Zhang, Yongze Cao, Yichao Wang, Xiangping Li, Sai Xu, Hongquan Yu, Baojiu Chen

Emission color change of the upconversion luminescence materials is often required for applications in optical anti-counterfeiting, laser lighting, and 3D displays. In this work, we developed a new route for chromatic tuning of upconversion emission upon two wavelength co-excitation by changing excitation power density. The proposed route was used for Er³⁺ single-doped Ba₃Lu₄O₉ phosphor which was derived from a traditional solid-state reaction. The crystal structure of the obtained Ba₃Lu₄O₉:Er³⁺ phosphor was characterized by X-ray diffraction and Rietveld refinement modeling. Under individual excitation of 980 or 1550 nm, it was found that the luminescence intensity ratio of red to green changes slightly with respectively increasing excitation power density (working current of the laser) of 980 or 1550 nm laser. However, upon both 980 and 1550 nm co-excitation at the same time and by adjusting the excitation power density of one laser amongst the two lasers, the luminescence intensity ratio of red to green changes greatly with increasing excitation power density. The change of luminescence intensity ratio of red to green implies the upconversion emission color tuning. The mechanism for the color tuning was discovered. It was found that with changing excitation power density the ratio of red to green changed greatly when the phosphor was irradiated by 980 and 1550 together, but the ratio of red to green changed slightly when the phosphor was irradiated individually by 980 or 1550. It is proved that it is feasible to turn color by the method of two infrared wavelengths excitation.

在光学防伪、激光照明和 3D 显示等应用中，经常需要改变上转换发光材料的发射颜色。在这项工作中，我们开发了一种新方法，通过改变激发功率密度，在两个波长共激发时实现上转换发射的色度调节。所提出的路线用于 Er3+ 单掺杂 Ba3Lu4O9 荧光粉，该荧光粉是通过传统固态反应得到的。获得的 Ba3Lu4O9:Er3+ 荧光粉的晶体结构通过 X 射线衍射和里特维尔德细化模型进行了表征。研究发现，在 980 或 1550 nm 的单独激发下，随着 980 或 1550 nm 激光激发功率密度（激光器工作电流）的增加，红绿发光强度比略有变化。但是，当 980 纳米和 1550 纳米激光同时共激发时，通过调整两束激光中一束激光的激发功率密度，红绿发光强度比会随着激发功率密度的增加而发生很大变化。红绿发光强度比的变化意味着上转换发射颜色的调谐。我们发现了颜色调谐的机理。研究发现，随着激发功率密度的变化，当荧光粉同时受到 980 和 1550 的辐照时，红绿比会发生很大变化，但当荧光粉分别受到 980 或 1550 的辐照时，红绿比会发生轻微变化。事实证明，用两种红外线波长激发的方法变色是可行的。

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引用次数: 0

Preparation of MAPbX3 perovskite thin film materials using in-situ doping atomized deposition methods 利用原位掺杂雾化沉积法制备 MAPbX3 包晶体薄膜材料

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-13 DOI: 10.1016/j.optmat.2024.116263

Wangchao Wan, Jindou Shi, Chen Zhang, Zheyuan Da, Junnan Wang, Qing Yao, Youlong Xu, Minqiang Wang

Thin films of organic halogenated perovskite MAPbX₃ (X = Cl, Br, I or mixed, CH₃NH₃ = MA) display exceptional optical and electronic properties, rendering them highly promising materials for next-generation optoelectronics. However, achieving a large, thin, and smooth film poses a considerable challenge. Compared with the traditional spraying method, the atomized deposition method is able to break down the precursor solution molecules in the atomization system, and this method produces films with thinner thicknesses(800–1000 nm), smoother surfaces, high light transmittance and low surface roughness. By investigating the deposition time, annealing temperature, and film stability associated with the atomized deposition technique, we determined the optimal process parameters for producing nanometer-thick perovskite films. Specifically, we set the precursor solution concentration to 0.1 mmol/L, the deposition time to 450 s, added PVDF (polyvinylidene fluoride) colloid at a concentration of 3 wt%, and maintained an annealing temperature of 80 °C for 20 min. Ultimately, perovskite films with tunable bandgap were prepared for anti-counterfeit marking applications. This method of preparing perovskite films represents a significant advancement towards their commercial utilization in the realm of optoelectronic materials.

有机卤化过氧化物 MAPbX3（X = Cl、Br、I 或混合，CH3NH3 = MA）薄膜显示出卓越的光学和电子特性，使其成为极具潜力的下一代光电材料。然而，实现大面积、薄而平滑的薄膜是一项相当大的挑战。与传统的喷涂法相比，雾化沉积法能在雾化系统中分解前驱体溶液分子，这种方法能生成厚度更薄（800-1000 nm）、表面更光滑、透光率高和表面粗糙度低的薄膜。通过研究与雾化沉积技术相关的沉积时间、退火温度和薄膜稳定性，我们确定了生产纳米厚的过氧化物薄膜的最佳工艺参数。具体来说，我们将前驱体溶液浓度设定为 0.1 mmol/L，沉积时间设定为 450 秒，加入浓度为 3 wt% 的 PVDF（聚偏氟乙烯）胶体，并将退火温度保持在 80 °C 下 20 分钟。最终，制备出带隙可调的过氧化物薄膜，用于防伪标识应用。这种制备磷光体薄膜的方法标志着在光电材料领域利用磷光体薄膜进行商业化方面取得了重大进展。

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引用次数: 0

Wet-spinning fabrication of stretchable multicolor fluorescent fibers augmented with dual-state emissive dyes 用双态发射染料湿法纺制可拉伸多色荧光纤维

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-12 DOI: 10.1016/j.optmat.2024.116259

Shuanglong Li, Guangming Tian, Xinhai He, Jianhua Ma, Dong Yang

Flexible luminous fibers have attracted wide attention in the field of functional and smart textiles. In this work, stretchable multicolor fluorescent fibers were successfully prepared by wet-spinning using thermoplastic polyurethane (TPU) and the boron ketoimine fluorophores (TPA-BKI dyes). Due to the donor (D)-acceptor (A) push-pull electronic system and highly twisted triphenylamine (TPA) skeleton, TPA-BKI dyes exhibited bright emission in both solution and solid states. Meanwhile, the polymer chains further improved the emission efficiency of TPA-BKI dyes in TPU matrix by avoiding close contact between dye molecules, as well as preventing intramolecular rotations in the excited states. Wet-spinning can be used for large-scale and continuous preparation of fluorescent fibers. The TPA-BKI/TPU fibers showed excellent flexibility, high mechanical strength, and bright multicolor fluorescent emission (green, yellow, and red, respectively) when the dye content was as low as 0.1 wt%. Overall, the feasibility of large-scale preparation of fluorescent fibers and their excellent properties, such as flexibility, multicolor fluorescence, and mechanical stability, make them suitable for potential applications, including clothing displays, fashion designs, security, and anti-counterfeiting.

柔性发光纤维在功能和智能纺织品领域引起了广泛关注。在这项工作中，利用热塑性聚氨酯（TPU）和硼酮亚胺荧光体（TPA-BKI 染料），通过湿法纺丝成功制备了可拉伸的多色荧光纤维。由于供体（D）-受体（A）推挽电子系统和高度扭曲的三苯胺（TPA）骨架，TPA-BKI 染料在溶液和固体状态下均表现出明亮的发射。同时，聚合物链避免了染料分子之间的紧密接触，防止了激发态的分子内旋转，从而进一步提高了 TPA-BKI 染料在热塑性聚氨酯基体中的发射效率。湿法纺丝可用于大规模连续制备荧光纤维。当染料含量低至 0.1 wt% 时，TPA-BKI/TPU 纤维显示出优异的柔韧性、较高的机械强度和明亮的多色荧光发射（分别为绿色、黄色和红色）。总之，大规模制备荧光纤维的可行性及其柔韧性、多色荧光和机械稳定性等优异性能，使其适用于服装展示、时尚设计、安全和防伪等潜在应用领域。

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引用次数: 0

Improvement of the photorefractive responsive time and optical damage resistance of LiNbO3 by co-doping with uranium and magnesium 通过共同掺杂铀和镁改善铌酸锂的光折射响应时间和抗光损伤性

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-11 DOI: 10.1016/j.optmat.2024.116223

Tian Tian , Tingfeng Wu , Jie Zhang , Shuolin Wang , Hongde Liu , Yuheng Chen , Yaoqing Chu , Hui Shen , Jiayue Xu

A series of uranium and magnesium co-doped LN crystals (LN: U, Mg) were successfully grown using the modified vertical Bridgman method. At 532 nm, the response time of LN: U, Mg was approximately 2 s. The saturated diffraction efficiency, refractive index modulation, and sensitivity decreased first and then increased with the enhanced MgO doping concentration. The electron was the dominant carrier, and the diffusion was the main migration mechanism. When co-doped with 7 mol% MgO, the optical damage threshold of LN: U was significantly improved to be as high as 2.36 × 10⁵ W/cm². The result of the OH⁻ spectrum showed that only 7 mol% exceeded the real threshold concentration of MgO in LN: U, which is consistent with the calculated result based on the Li-vacancy model. In addition, the photorefractive centers and optical damage were also discussed.

利用改进的垂直布里奇曼法成功生长了一系列铀和镁共掺杂的 LN 晶体（LN：U，Mg）。随着氧化镁掺杂浓度的增加，饱和衍射效率、折射率调制和灵敏度先下降后上升。电子是主要载流子，扩散是主要迁移机制。当共同掺杂 7 mol% MgO 时，LN：U 的光损伤阈值显著提高，高达 2.36 × 105 W/cm2。OH- 光谱结果显示，只有 7 mol% 的氧化镁超过了 LN: U 中氧化镁的实际阈值浓度，这与基于锂空穴模型的计算结果一致。此外，还讨论了光折射中心和光学损伤问题。

引用次数: 0

Femtosecond laser-induced damage on the surface of KDP crystals by Zn2+ doping Zn2+ 掺杂对 KDP 晶体表面的飞秒激光诱导损伤

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2024-10-11 DOI: 10.1016/j.optmat.2024.116258

Yan Liu , Yujia Zhang , Xiaoqing Liu , Chengrui Tian , Jiezhao Lv , Changfeng Fang , Qingbo Li , Chun Wang , Xian Zhao

An experimental and numerical study of femtosecond laser-induced surface damage of the potassium dihydrogen phosphate (KDP) crystals doped with Zn²⁺ is presented. Based on COMSOL® Multiphysics 6.1, electron-lattice nonequilibrium interactions were simulated to obtain the temporal evolution of electron concentration, electron temperature, and lattice temperature. The surface damage profile of the samples was analyzed by optical microscopy, and the single-pulse damage threshold was determined. Raman spectra shows that the chemistry of the crystals appeared to remain constant before and after the damage. Single-particle fluorescence spectroscopy indicates that the fluorescence intensity first decreased and then increased with increasing doping concentration. However, the laser-induced damage threshold (LIDT) was negatively correlated with the defect concentration, which may be a result of the synergistic effect of nonlinear adsorption and defect concentration. The above work attempts to give a rational explanation for the process of femtosecond laser damage to the surface of KDP crystals.

本文介绍了飞秒激光诱导掺杂 Zn2+ 的磷酸二氢钾（KDP）晶体表面损伤的实验和数值研究。基于 COMSOL® Multiphysics 6.1，模拟了电子-晶格非平衡相互作用，从而获得了电子浓度、电子温度和晶格温度的时间演化。通过光学显微镜分析了样品的表面损伤曲线，并确定了单脉冲损伤阈值。拉曼光谱显示，晶体的化学性质在损伤前后似乎保持不变。单颗粒荧光光谱显示，随着掺杂浓度的增加，荧光强度先减弱后增强。然而，激光诱导损伤阈值（LIDT）与缺陷浓度呈负相关，这可能是非线性吸附和缺陷浓度协同作用的结果。上述工作试图合理解释飞秒激光对 KDP 晶体表面的损伤过程。

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