1 西南石油大学信息学院，四川 南充 637001
2 四川大学物理学院，四川 成都 610064
利用Z扫描技术研究了曙红Y、酞菁锌、曙红Y/酞菁锌复合薄膜的非线性吸收特性。在脉冲能量为130 μJ、脉宽为4 ns、波长为532 nm的激光作用下，实验显示曙红Y具有较强的饱和吸收，酞菁锌具有较强的反饱和吸收，吸收特性随着质量分数的增加而增强，重复测试表明两者都具有良好的稳定性。曙红Y/酞菁锌复合的聚乙烯醇（PVA）薄膜兼备饱和吸收与反饱和吸收特性，通过调整质量分数配比可调控透过率，调节材料的非线性吸收系数，实现材料限幅特性的“加法”。此种复合材料可用于新型光限幅器和光开关等光学器件。
非线性光学 曙红Y/酞菁锌复合薄膜 可调节非线性吸收 Z扫描技术 光学学报
2022, 42(22): 2219003
Author Affiliations
Abstract
1 Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
2 Université Polytechnique Hauts de France, IEMN DOAE CNRS, Campus Le Mont Houy, 59309, Valenciennes Cedex, France
Goodness of fit is demonstrated for theoretical calculation of z-scan data based on beams propagating in the nonlinear medium and the Fresnel–Kirchhoff diffraction integral in experiments with high nonlinear refraction and absorption. The constancy of nonlinear optical parameters is achieved regardless of sample thickness and laser intensity, which clarifies the physical significance of optical parameters. We have obtained = 2.0 × 10?19 m2/W and = 5.0 × 10?13 m/W for carbon disulfide excited by a pulsed laser at 800 nm with pulse duration of 35 fs, which are independent of sample thickness and laser intensity. Affirming constancy of the extracted parameters to the incident light intensity may become a practice to verify the goodness of the z-scan experiment.
z-scan technique nonlinear refraction and absorption nonlinear optical coefficient carbon disulfide Chinese Optics Letters
2020, 18(7): 071903
Author Affiliations
Abstract
Laser Applications Research Group (LARG), Department of Physics, College of Science, University of Basrah, Basrah, Iraq
Bi2S3-xSex/poly(methyl methacrylate) (PMMA) nanocomposite films were prepared using microwave assisted synthesis with different compositions of x. Crystal structure, surface morphology, and optical properties were investigated to characterize the prepared nanocomposite films. The crystallinity and optical band gap of the prepared Bi2S3-xSex/PMMA were affected by x. The prepared samples showed a blue shift in the absorption edge. The laser power dependent nonlinear refraction and absorption of Bi2S3-xSex/PMMA nanocomposite films were investigated by using the Z-scan technique. The optical nonlinearity of the nanocomposite films exhibited switchover from negative nonlinear refraction to positive nonlinear refraction to negative nonlinear refraction effects, and from saturable absorption to reverse saturable absorption to saturable absorption with an increase and decrease in the composition. An interesting all-optical figure of merit was reported to assess the nanocomposite films for a practical device. It was calculated that the device all-figures of merit were based on the nonlinear response, which is important for the all-optical switching device. The results demonstrate that the optimized all-optical figures of merit can be achieved by adjusting the composition and input laser power, which can be used for the design of different all-photonic devices, and the results of nonlinear switching behavior can open new possibilities for using the nanocomposite films in laser Q-switching and mode-locking.
bismuth chalcogenides Bi2S3-xSex/PMMA nanocomposite Z-scan technique nonlinear absorption and refraction all-optical figures of merit Chinese Optics Letters
2020, 18(1): 011902
采用微球自组装及倾斜真空热蒸镀技术制作了三维手性壳状银纳米结构,采用Z扫描技术研究了该样品在532nm波长、4ns脉宽的Nd:YAG 激光入射下的非线性饱和吸收特性。研究结果表明,当入射激光强度达到 2.5×109 W/cm2时,其非线性吸收系数可达-1.45×10-5 cm/W,该结果比文献报道的悬浮液中的胶体银纳米颗粒的非线性吸收系数(-1.5×10-9 cm/W)大四个数量级。实验还发现,该样品的非线性吸收系数随着入射激光的偏振方向改变而出现明显的变化。文中对其非线性吸收的增强机理及偏振依赖性进行了分析讨论。
银纳米结构 非线性饱和吸收 Z扫描技术 Silver nanostructures Nonlinear saturation absorption Z-scan technique
Author Affiliations
Abstract
1 Laboratory of Thin Film Optics, Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
4 National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China
The nonlinear absorption (NLA) properties of potassium dideuterium phosphate crystals at 515 nm under different excitation laser intensities are investigated with the Z-scan technique. Two critical intensities are highlighted: the critical intensity for exciting the NLA and the critical intensity of the multiphoton absorption mechanism transition. Experimental results indicate the existence of defect states located in the band gap, which can be manipulated by varying laser intensity. A model based on the change of multiphoton absorption mechanism induced by the transformation of defect species is proposed to interpret the experiments. Modeling results are in good agreement with the experiment data.
multiphoton processes nonlinear optical materials Z-scan technique High Power Laser Science and Engineering
2018, 6(3): 03000e41
1 北京交通大学电子信息程学院, 北京 100044
2 中央民族大学理学院, 北京 100081
3 忻州师范学院化学系, 山西 忻州 034000
鉴于二茂铁衍生物在光电功能材料方面的应用，以乙酰基二茂铁和对二甲氨基苯甲醛为原料，经缩合反应合成了一种具有大π 共轭体系，以二茂铁酮基为电子受体，二甲氨基苯基为电子供体的新型二茂铁衍生物，1-二茂铁基-3-(4-二甲胺基苯基)-丙-2-烯-1-酮，通过核磁共振对化合物结构进行表征。结合刮刀法和梯度升温法制备出质量分数为4%的二茂铁衍生物/聚酰亚胺复合薄膜。利用分光光度计测定了该化合物的紫外-可见吸收光谱，并通过透射光谱法得到薄膜的光学常数，采用单光束Z 扫描技术测试了薄膜三阶非线性光学特性。1-二茂铁基-3-(4-二甲胺基苯基)-丙-2-烯-1-酮薄膜的三阶非线性极化率为1.0375×10-11 esu，优于光纤三个数量级，可用于制备光电器件。
非线性光学 二茂铁 Z 扫描技术 电子供体-受体 透射光谱法 激光与光电子学进展
2015, 52(6): 061901
1 中南大学物理与电子学院 超微结构与超快过程湖南省重点实验室, 湖南 长沙 410083
2 浙江师范大学LED芯片研发中心, 浙江 金华 321004
3 中国科学院半导体研究所 超晶格与微结构国家重点实验室, 北京 100083
利用飞秒激光Z-扫描与泵浦-探测技术, 研究了室温下ZnO/ZnS与ZnO/ZnS/Ag核-壳胶体量子点的双光子吸收效应。研究发现: ZnO基核-壳量子点的本征双光子吸收系数比ZnO体材料增大了3个数量级; 测量得到的660 nm处的ZnO/ZnS核-壳量子点双光子吸收截面约为4.3×10-44 cm4·s·photon-1, 比相应的ZnS、ZnSe及 CdS量子点大2个数量级; 当ZnO/ZnS核-壳量子点镶嵌了银纳米点时, 非线性吸收有所增强。ZnO基复合纳米结构的双光子吸收增强可归因于量子限域与局域场效应。
双光子吸收 ZnO/ZnS核-壳量子点 Z-扫描技术 two-photon absorption ZnO/ZnS core/shell quantum dots Z-scan technique
1 北京交通大学 光波技术研究所, 全光网络与现代通信网教育部重点实验室, 北京 100044
2 中央民族大学 理学院, 北京 100081
3 忻州师范学院化学系, 山西 忻州 034000
以咔唑为电子供体, 苯并噻唑为电子受体, 合成了两种新型咔唑-苯并噻唑衍生物3-(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑和3,6-二(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑, 通过核磁共振和分光光度计对其结构进行表征.利用刮刀法制备质量分数为4%的衍生物/聚酰亚胺的复合薄膜.采用透射光谱法和单光束Z-扫描技术分别测试了衍生物的线性和三阶非线性光学特性. Z扫描实验结果表明3-(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑薄膜的非线性吸收系数和非线性折射系数分别为β1=－2.118 9×10－10 cm/W、r1=2.285 2×10－14 cm2/W, 具有反饱和吸收特性和自聚焦效应;同时3,6-二(2-苯并噻唑-2-基乙烯基)-N-乙基咔唑薄膜的非线性吸收系数与非线性折射系数分别为β2=－1.275 6×10－9 cm/W、r2=－7.039 9×10－14 cm2/W, 具有反饱和吸收特性和自散焦效应.
电子供体-受体 咔唑 苯并噻唑 有机薄膜 透射光谱法 Z扫描技术 三阶非线性光学特性 Electron donor-acceptor Carbazole Benzothiazole Organic thin film Transmission spectrum method Z-scan technique Third-order nonlinear optical property
深圳大学电子科学与技术学院, 深圳市激光工程重点实验室, 广东 深圳 518060
采用金属离子注入技术制备了注入剂量分别为0.5×1017，1×1017，1.5×1017 cm-2的Zn纳米颗粒复合材料。结合共聚焦激光扫描显微镜和透射电子显微镜，观察了Zn纳米颗粒大小及其物相。利用单光束Z扫描技术，在波长为1064 nm的入射光作用下，分别测量了样品的非线性光学折射率系数和非线性光学吸收系数。结果表明，Zn纳米颗粒复合材料是自散焦反饱和吸收材料，随着注入剂量的增加，材料的三阶非线性光学系数有不同程度的增加。通过适当选择注入剂量的浓度，可得到在1064 nm波段样品的最佳三阶非线性光学系数。
非线性光学 纳米颗粒 离子注入 Z扫描技术 光学学报
2013, 33(s2): s219001
南开大学弱光非线性光子学教育部重点实验室, 天津 300071
利用飞秒激光抽运探测和Z扫描技术研究了氧化石墨烯和在不同还原时间下的氧化石墨烯的超快动力学过程及非线性吸收性质。将氧化石墨烯用肼蒸汽还原，通过控制还原时间，得到不同的还原氧化石墨烯材料。通过X射线光电子光谱实验测试了材料的含氧量和不同官能团含量。抽运探测实验结果显示还原后石墨烯载流子衰减速度明显加快，各官能团的含量也会影响载流子的衰减过程。Z扫描实验结果显示还原后样品的饱和吸收明显增强。对氧化石墨烯还原后，再延长还原时间并不能明显改变还原氧化石墨烯的饱和吸收性质，这种变化同还原氧化石墨烯的结构变化相关。
非线性光学 Z扫描技术 还原氧化石墨烯 抽运探测技术
