1 中国科学院光电技术研究所微细加工光学技术国家重点实验室，四川 成都 610209
2 中国科学院大学，北京 100049
3 中国科学院光电技术研究所矢量光场研究中心，四川 成都 610209
高阶贝塞尔光束能够携带轨道角动量，且具有无衍射特性，在粒子操控、激光微纳加工及非线性光学等领域具有重要应用价值。目前产生高阶贝塞尔光束的方式无法同时满足集成化和高功率场景的应用需求。基于飞秒激光诱导的双折射纳米光栅结构，提出一种高损伤阈值的集成化光场调控器件制备方法。通过调控纳米光栅的光轴方向和相位延迟量，在石英玻璃内部写入光轴取向空间变化的多层纳米光栅结构，制备的器件可以实现不同光场调控功能的叠加和不同工作波长的设计。基于所提方法制备了中心波长为532 nm、拓扑荷值为4的高阶贝塞尔光束产生器件。器件产生的高阶贝塞尔光束携带的轨道角动量与设计值相符，在4 m距离内光斑大小保持基本不变。器件的零几率激光损伤阈值为28.5 J/cm2（6 ns），在高功率激光光束整形等领域具有极大的应用潜力。
激光光场调控 高阶贝塞尔光束 集成化光学元件 飞秒激光 纳米光栅 激光损伤阈值 光学学报
2023, 43(13): 1326003
Author Affiliations
Abstract
1 Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2 Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
3 Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511, USA
Cylindrical shockwaves inside polymethyl methacrylate (PMMA) generated simultaneously with two hemispherical shockwaves induced by a femtosecond Gaussian beam laser were investigated using an ultrafast pump–probe imaging technique. The evolutions of these three shockwaves with probe delay and incident pulse number have been systematically analyzed. The plasma intensity and filament length in the center of cylindrical shockwave both decayed with pulse number. Moreover, the self-focused filament moved downstream towards the output surface with an increased pulse number. The experimental results and mechanism illustrated that energy deposition was suppressed by a degraded nonlinear effect due to a pre-ablated structure in multi-pulse irradiation.
140.7090 Ultrafast lasers 320.7120 Ultrafast phenomena 350.5400 Plasmas 350.3390 Laser materials processing Chinese Optics Letters
2019, 17(8): 081405
Author Affiliations
Abstract
Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
An interesting transition between low spatial frequency laser-induced periodic surface structure (LIPSS) and high spatial frequency LIPSS (HSFL) on the surface of nickel is revealed by changing the scanning speed and the laser fluence. The experimental results show the proportion of HSFL area in the overall LIPSS (i.e., K) presents a quasi-parabola function trend with the polarization orientation under a femtosecond (fs) laser single-pulse train. Moreover, an obvious fluctuation dependence of K on the pulse delay is observed under a fs laser dual-pulse train. The peak value of the fluctuation is found to be determined by the polarization orientation of the dual-pulse train.
220.4241 Nanostructure fabrication 320.2250 Femtosecond phenomena 260.5430 Polarization 320.5540 Pulse shaping Chinese Optics Letters
2015, 13(6): 062201
苏州大学 电子信息学院, 江苏 苏州 215006
综述了不同类型上转换器件的的研究进展, 包括性能优化、器件集成以及物理机制。其中基于OLED的红外上转换器件将红外探测器与OLED串联集成起来, 使近红外光首先被吸收, 进而光生电流驱动OLED产生可见光, 可完成近红外-可见光上转换功能。该项研究拓展了OLED在红外夜视方面的应用。
近红外 上转换成像 有机发光二极管 光电探测 near infrared upconversion imaging organic light-emitting device(OLED) photoelectronic detection
西安工业大学 陕西省薄膜技术与光学检测重点实验室，陕西 西安 710032
介绍了一种确定抛物面反射镜光轴的新方法。当抛物面反射镜绕着机械旋转轴旋转时，利用2束平行光(一束与机械旋转轴平行的光和一束与机械旋转轴成一定角度的斜平行光)经抛物面反射镜反射的像点运动，调整抛物面反射镜的位置，使光轴与机械旋转轴重合。理论分析结果表明：其定轴的倾斜误差不大于1′，平移误差不大于5μm。该方法可用于抛物面反射镜检验，也可用于抛物面反射镜的调校工艺中。
反射抛物面 定光轴 非球面加工 reflecting paraboloid alignment of optical axis aspheric processing
