minable

Based on natural condition, water resource situation and contradiction between water supply and demand in Tongsuo District, the writers made an analysis on river runoff and exploitable amount of groundwater, proved the shortage level of water resources, estimated the total water demand and that of 2010.

针对同朔地区自然条件、水资源状况和供需之间的矛盾 ,分析了该地区河川径流量和地下水可开采量 ,客观地论证了该地区水资源的短缺程度。

Multiwavelength Switchable Fiber Laser Based on a High-Birefringence Fiber Loop Mirror;

基于光纤环镜的多波长可开关光纤激光器的研制

We summarize the main technologies and methods reported recently to realize the room-temperature MWFLs, and introduce our innovative works in this field, including proposing several novel structures and operable technologies of switchable multi-wavelength fiber lasers using special fiber Bragg gratings (FBG) with several.

介绍了近几年我们在该领域的一些创新性研究工作:提出了多种基于多谐振峰的光纤布拉格光栅(FBG) ,如多模光纤布拉格光栅、保偏光纤布拉格光栅、取样光纤布拉格光栅等的可开关多波长光纤激光器的新方法和新结构,实现了多种波长间隔小于2 nm,室温工作稳定性好、波长及波长间隔可调的可开关多波长光纤激光器;提出了基于非线性光纤环镜( NOLM)和非线性偏振旋转(NPR)效应的两种多波长掺铒光纤激光器(EDFL)实现技术,实现了室温稳定、功率谱分布平坦的宽带多波长激光输出,3 dB带宽内的波长个数可达50个,每个波长的功率波动在2 h内小于0 。

A switchable and spacing-tunable dual-wavelength linear cavity erbium-doped fiber (EDF) laser based on a polarization-maintaining fiber Bragg grating (PM-FBG) is demonstrated experimentally.

提出了一种基于保偏光纤(PMF)中布拉格光栅的波长间隔可调的可开关双波长掺铒光纤激光器(EDFL)。