Author Affiliations
Abstract
State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
A constant elastic alloy is a widely used material with a high elastic modulus and an excellent wave velocity consistency. Different morphologies on the constant elastic alloy surface are observed through femtosecond laser irradiation. When the laser average fluence is set to 0.58 J/cm2 and 200 laser pulses, with the increasing depth of distilled water, the period of the laser-induced periodic surface structures (LIPSS) becomes shorter accordingly. The higher the ethanol concentration is, the more spot-shaped structures will be formed among the surface structures when the depth of the coverage of ethanol is 2 mm. The period of the LIPSS reaches its maximum when the concentration of ethanol is 80%.
320.2250 Femtosecond phenomena 220.4241 Nanostructure fabrication 100.0118 Imaging ultrafast phenomena Chinese Optics Letters
2017, 15(2): 021404
Author Affiliations
Abstract
The State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
A fused silica glass micro-channel can be formed by chemical etching after femtosecond laser irradiation, and the successful etching probability is only 48%. In order to improve the micro-channel fabrication success probability, the method of processing a high-temperature lattice by a femtosecond laser pulse train is provided. With the same pulse energy and scanning speed, the success probability can be increased to 98% by optimizing pulse delay. The enhancement is mainly caused by the nanostructure, which changes from a periodic slabs structure to some intensive and loose pore structures. In this Letter, the optimum pulse energy distribution ratio to the etching is also investigated.
140.0140 Lasers and laser optics 230.7380 Waveguides, channeled Chinese Optics Letters
2017, 15(7): 071403
1 中南大学 高性能复杂制造国家重点实验室, 湖南 长沙 410083
2 罗彻斯特大学光学研究所, 纽约 14627
与传统传感器相比, 全光纤马赫泽德尔干涉仪(MZI)传感器, 具有结构简单、分辨率高、稳定性好等优点, 在石油化工、健康监测、生物化学等领域有广泛应用。介绍了MZI全光纤传感器的传感机理,对比了其他的加工方法, 如电弧放电、加热拉伸、CO2激光诱导微变形等的优缺点, 详细介绍了飞秒激光加工得到的MZI传感器的结构形式、折射率和温度等传感性能。重点阐述了飞秒激光加工MZI的研究现状和优点, 并对运用飞秒激光方法加工的MZI进行了总结和展望。
飞秒激光 全光纤MZI传感器 传感特性 Femtosecond laser All fiber MZI sensors Sensing performances
1 浙江大学 信息科学与电子工程系，杭州 310027
2 浙江大学 信息科学与电子工程系，杭州 310027
基于波导的几何光学理论，并考虑谐振腔的品质因素或光子寿命，给出了毫米级圆碟回音壁模式谐振时的条件，应用光子隧道效应，分析了输入输出波导与圆碟的耦合特性，详细分析并给出了品质因素为5×105环形电极铌酸锂圆碟调制器中回音壁模式与波导的耦合与限制条件.提出一种利用铌酸锂Mach-Zehnder波导与同质材料圆碟构成的微波接收转换装置，该装置能够实现推挽操作，在具有较高频率分辨特性的基础上能进一步降低驱动电压，而且器件尺寸进一步减小.
光载无线通信 共振腔 回音壁模式 铌酸锂 波导 光子隧道效应 耦合 ROF Resonator Whispering gallery mode Lithium niobate Waveguide Photon tunneling effect Coupling
