包层泵浦技术原理及其应用

文章首先介绍了双包层光纤的结构特点,然后结合这些特点详细地介绍了包层泵浦技术的基本原理与包层泵浦技术中的一些关键的泵浦耦合技术,最后,对包层泵浦技术当前及潜在的一些应用作了详细的介绍.     

包层泵浦上转换光纤激光器进展

本文在概述频率上转换和包层泵浦技术的基础上,综述了近年来频率上转换激光器进展,展望了包层泵浦上转换光纤激光器的发展前景。     

包层泵浦光纤激光器及应用

详细阐述了包层泵浦光纤激光器的基本原理及一些关键的泵浦耦合技术,最后介绍了基于这种技术的高功率光纤激光器在光纤通信、印刷、医疗、军事等领域的应用。     

包层泵浦光纤激光器长度优化设计的研究

文章基于三能级系统光纤激光器的速率方程模型,重点分析了输入端反射系数R1、输出端反射系数R2以及泵浦功率这3个因素对包层光纤激光器最佳光纤长度L优化的影响.并用数值仿真进行了研究,得到了有意义的结果,对包层泵浦光纤激光器的研究具有重要意义.     

双包层光纤激光器中包层光的滤除

双包层光纤激光器的输出性能及稳定性与包层光的滤除程度有关。光纤激光器输出光中的剩余抽运光不仅会影响到输出光的单色性,还会对输出设备造成损害,甚至破坏光学器件。通常在内包层外涂一种高折射的导光胶来滤除包层光,但此方法使包层光在较短的长度内被大量地滤除,导致热沉上功率密度较高,给散热带来较大的压力。实验中采用3种不同折射率的导光胶,分步滤除包层光,减小局部温度过高。采用Zemax和Matlab软件研究了此滤除方式的特点,搭建了验证实验系统。实验结果表明,输出激光中的包层光已被滤除,滤除效果可达到20 dB,且热量分布均匀,不会引起局部温度过高。     

包层泵浦调Q光纤激光器的研究进展

从双包层光纤和包层泵浦调Q技术对包层泵浦调Q光纤激光器的研究和发展进行了综述，并报道了我们在该领域的最新研究结果。     

高功率光纤激光器的残留包层光滤除研究

为了提高大功率双包层光纤激光器的光束质量、光谱特性以及光纤系统的稳定性,设计了一种用于滤除光纤内包层残留光的新型高功率包层光滤除器。采用蒙特卡洛算法以及光线轨迹追踪法对包层光滤除器进行了数值计算,评估包层光滤除器的滤除能力,并借助计算流体力学软件ANSYS,分析包层光滤除器的温度场分布。结果表明,优化级联结构后的包层光滤除器的滤除效果达到16.7dB,降低了包层光滤除器的热点温度,在600W的输入功率下,热点温度降低了20.8℃,实现了包层光功率的均匀滤除;在滤除功率达到千瓦量级时,该包层光滤除器仍能够稳定工作在70℃以内,满足大功率光纤激光器系统稳定运行的要求。     

光纤激光器中包层光滤除器的研究进展

包层光滤除器对高功率光纤激光器系统的作用非常重要,影响着输出激光的光束质量和单色性,包层光滤除器是光纤激光器产品化的核心元器件。本文简述了光纤激光器包层光滤除器的工作原理,总结了几种包层光滤除器的结构和工作性能,分析了其优缺点,对包层光滤除器的研究方向具有一定的指导意义。     

光纤电流传感器微弱信号检测技术

介绍了光纤电流传感器的性能特点，详细地论述了光纤电流传感器的噪声根源及如何准确无误了检测掩理噪声中的微弱信号，着重介绍了数字多点平均技术，并给出基于数字多点平均技术的检测电路和程序流程图。     

A distributed fiber optic sensor based on cladding fluorescence

The fiber for the sensor is formed by cladding fused silica during drawing with polydimethyl siloxane into which an organic fluorescent dye, 9, 10-diphenylanthracene, has been dissolved. Upon side illumination at a wavelength within the excitation range of the dye, the cladding fluoresces; some of this fluorescence is coupled into guided modes in the fiber core through the evanescent fields of these modes. In the presence of oxygen, fluorescent emission by the dye is diminished. For the sensor described, the rubbery liquidlike nature of the polydimethyl siloxane cladding allows rapid diffusion of gases, and the intensity of the guided fluorescence is observed to drop by 30% in less than 5 s when the ambient atmosphere changes from pure nitrogen to pure oxygen. The advantages of this sensing technique, and some of the possibilities for new sensors based on this principle, are discussed     

CORDIC algorithm based digital detection technique applied in resonator fiber optic gyroscope

A digital detection technique based on the coordinate rotation digital computer (CORDIC) algorithm is proposed for a resonator fiber optic gyroscope (R-FOG). It makes the generation of modulation signal, synchronous demodulation and signal processing in R-FOG to be realized in a single field programmable gate array (FPGA). The frequency synthesis and synchronous detection techniques based on the CORDIC algorithm have been analyzed and designed firstly. The experimental results indicate that the precision of the detection circuit satisfies the requirements for the closed-loop feedback in R-FOG system. The frequency of the laser is locked to the resonance frequency of the fiber ring resonator stably and the open-loop gyro output signal is observed successfully. The dynamic range and the bias drift of the R-FOG are ±1.91 rad/s and 0.005 rad/s over 10 s, respectively.     

Pigtailed single-mode fiber optic light modulator in silicon

The performance of a light modulator at a 1.3 μm wavelength based on the plasma effect in silicon is described. The modulator is directly coupled to a single-mode fiber pigtail in a simple and robust package. The measured modulation index is 24% with a 3-dB bandwidth of 60 MHz, and the insertion loss is 5 dB. This modulator has applications in data acquisition from silicon sensors and other silicon ICs     

模块化多功能光纤检测系统

光纤测试大都使用多个独立设备组建测试环境,因其种类繁多,使测试过程中存在人为操作误差。为了解决此类问题,设计了将多个测试设备的功能合成一体的模块化多功能光纤检测系统,给出了该系统的硬件组成、软件组成以及实测数据。经过第三方检验机构的检验,结果表明该系统已达到目前台式测试设备指标,能够替换目前多个独立设备组建的测试环境。     

基于开环检测系统的全光纤电流互感器研究

商用化的全光纤电流互感器（FOCT）的误差一般要求小于0.2%,信号处理方法是决定该类传感器测量准确度的关键因素。论述了全光纤电流互感器的光路结构、工作原理、技术优势和干涉信号特征,提出了一种基于数字开环的全光纤电流互感器检测系统以及实现方案,论述了其工作原理和特点,试验结果表明,该检测方法提高了全光纤电流互感器的性能,使其满足了0.2 级测量用电子式电流互感器的准确度要求, 对解决全光纤电流互感器的信号处理、测量准确度和测量灵敏度等问题具有较大的参考价值。     

光纤陀螺中的关键技术分析

光纤陀螺作为一种新型的陀螺,正逐渐成为捷联惯导系统中最重要的传感器件.简要论述了光纤陀螺的基本原理和工作过程,并对光纤熔接技术、光纤绕制技术、误差检测和补偿技术、系统动态误差补偿技术、光源以及噪声抑制技术、集成光学芯片技术、数字信号处理电路等关键技术作了详细分析.     

Remote detection of ciliary movement by fiber optic laser-Dopplerspectroscopy

The development and validation of a fiber-optic laser-Doppler spectrometer to measure the movement of cilia in situ is described. The spectrometer was calibrated with reference to high-speed cinematography. The transfer function demonstrates an excellent correlation between these two methods in a range of frequency of ciliary beat extending from 3 to 38 Hz. Results are reported showing that this instrument can reliably and reproducibly detect and record ciliary activity inside the airways and the oviduct. The fiber-optic probe of the laser spectroscope can be easily introduced via the biopsy channel of a bronchoscope or laparoscope