随机分布反馈掺铒光纤激光器研究

发布时间：2018-01-12 11:24

本文关键词：随机分布反馈掺铒光纤激光器研究　出处：《中国计量学院》2015年硕士论文　论文类型：学位论文

【摘要】：随机分布反馈光纤激光器(RDFFL)是近几年才发展起来的一种新型光纤激光器。其在结构上区别于传统激光器,即无固定的反射镜。可实现稳定的、空间低相干的、连续激光输出,被认为是一种重要的新光源,可用于非线性光学、光通信和传感等领域。本文以掺铒光纤为增益介质,研究并实现了三种随机分布反馈掺铒光纤激光器。1.提出并研究了基于掺铒光纤的单泵浦半开放腔随机分布反馈激光器。采用掺铒光纤为增益介质,利用光纤布拉格光栅(FBG)和长距离(5-30km)普通单模光纤中的随机瑞利散射构成的“谐振腔”,在1480 nm的激光二极管的泵浦下,实现了随机分布反馈掺铒光纤激光器。该激光器的泵浦阈值功率只有10 m W,比基于拉曼散射放大的随机光纤激光器的阈值功率低了约两个数量级。2.提出并研究了一种基于掺铒光纤的半开放腔可调谐随机分布反馈激光器。通过1480 nm激光二极管泵浦掺铒光纤,利用长距离光纤中的瑞利散射做为随机分布反馈,利用光纤法布里-珀罗干涉滤波器来实现激光的波长调谐,获得调谐范围达40 nm(1525 nm至1565 nm)、线宽只有0.04 nm的可调谐随机分布反馈掺铒光纤激光器。激光器的阈值功率只有13 m W,转换效率高达14%。3.提出并研究了一种基于铒/镱共掺光纤相移光栅的随机激光器。在一段40 mm的高掺杂浓度的铒/镱共掺光纤上直接刻写一个25 mm长的光纤布拉格光栅,并在光栅不同位置处引入20个幅度在0.2π和1.9π之间随机分布的相移点,然后通过980 nm的激光二极管来泵浦,获得了光信噪比高达65 d B的随机激光输出,并研究了其输出特性和利用水浴法提高了其稳定性。具我们所知,如果仅考虑光纤的有效部分长度,这是迄今为止报道的最短随机光纤激光器。
[Abstract]:Random distributed feedback fiber laser (RDFFLL) is a new type of fiber laser developed in recent years. Its structure is different from the traditional laser, that is, there is no fixed mirror, which can achieve stability. Space low coherent CW laser output is considered as an important new light source which can be used in nonlinear optics optical communication and sensing. In this paper erbium-doped fiber is used as gain medium. Three kinds of erbium-doped fiber lasers with random distributed feedback are studied and realized. A single-pumped semi-open cavity random distributed feedback laser based on erbium-doped fiber is proposed and studied. Erbium-doped fiber is used as gain medium. A "resonator" composed of random Rayleigh scattering from fiber Bragg grating (FBG) and long distance (5-30km) single mode optical fiber is pumped by a 1480nm laser diode. A random distributed feedback erbium-doped fiber laser is realized. The pump threshold power of the laser is only 10 MW. The threshold power of random fiber laser based on Raman scattering amplification is about two orders of magnitude lower than that of random fiber laser based on Raman scattering. A semi-open cavity tunable random distributed feedback laser based on erbium-doped fiber is proposed and studied. 0. Erbium-doped fiber pumped by nm laser diode. Rayleigh scattering in long distance fiber is used as random distributed feedback, and fiber Fabry-Perot interference filter is used to realize wavelength tuning of laser. The tuning range is from 40 nm(1525 nm to 1 565 nm). A tunable random distributed feedback erbium-doped fiber laser with a linewidth of only 0.04 nm has a threshold power of only 13 MW. A random laser based on erbium / ytterbium-co-doped fiber phase-shifting grating is proposed and studied. A 25mm long fiber Bragg grating is directly engraved on a high doped erbium / ytterbium co-doped fiber. Twenty random phase shifting points with amplitude between 0.2 蟺 and 1.9 蟺 are introduced at different positions of the grating, and then pumped by a 980 nm laser diode. A random laser output with a signal-to-noise ratio of up to 65 dB has been obtained, and its output characteristics have been studied and its stability has been improved by using the water bath method. As we know, only the effective partial length of the fiber is considered. This is the shortest random fiber laser reported so far.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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