A simple method to mechanically induce a long-period fiber grating (LPFG) by a grooved plate is improved. The transmission spectra of a grating under different pressures and other types of gratings are experimentally investigated. This method is simple an
A new distributed optical fiber sensor system for long-distance oil pipeline leakage and external damage detection is presented. A smart and sensitive optical fiber cable is buried beneath the soil running along the oil pipeline, which is sensitive to soa
In this paper, by means of a high-sensitive optical beam deflection technique combined with electrical delay technique, shock wave and cavitation effects by laser ablation of a metal in water are investigated in detail. The system is quite handy, and of h
The recent realizations of a topological valley phase in a photonic crystal, an analog of gapped valleytronic materials in an electronic system, are limited to the valley Chern number of one. In this paper, we present a type of valley phase that can have
Light carrying orbital angular momentum (OAM) has a spatial distribution of intensity and phase, which attracts considerable interest regarding several potential applications in optical and quantum scenarios recently. Spiral phase plates are commonly used
埃克森研究和技术中心向可按比例放大的、供铀同位素浓缩使用的访微米光源迈出了重要的一步。10月23日埃克森中心的P. Rabinowitz在阿纳海姆举行的“79年电光-激光”会议上报道说,使二氧化碳激光器的10.6微米的输出在氢气中发生喇曼频移,从而在623厘米―1上产生1.6焦耳、20兆瓦的脉冲。这种方法最先是由斯坦福大学的R. L. Byer提出和演示的,但他的小组所得的输出能量低得多。人们正在为六氟化铀的选择分离寻找在其波长上有强烈吸收的16微米的光源。