脉冲ASE光源泵浦光子晶体光纤产生超连续谱

发布时间：2018-04-28 05:17

本文选题：脉冲ASE + 放大　；参考：《国防科学技术大学》2015年硕士论文

【摘要】：在诸如光学相干层析技术等应用中,要求光源具有低时间相干性,以获得高成像分辨率。一方面,放大的自发辐射(ASE)光源作为一种非相干光源,自身可以满足这样的要求;另一方面,ASE用于泵浦非线性介质产生超连续谱,以其宽光谱和低时间相干性的特点,可以满足更多的应用需求。本文对脉冲ASE光源的产生、放大以及用于泵浦光子晶体光纤产生超连续谱的过程开展研究,主要内容包括:一.获得了纳秒脉冲ASE种子源。采用光纤环形反射镜结构提高带内功率,得到280 mW连续窄谱带ASE输出;利用AOM和EOM共同调制连续窄谱带ASE,得到脉宽8 ns、重频50 kHz、平均功率50?W的脉冲ASE。二.采用主振荡功率放大结构放大脉冲ASE,获得49W功率输出。通过改变种子脉冲中8 ns窄带尖脉冲在40 ns基底宽脉冲的相对位置,改善输出脉冲时域形状并提升其峰值功率;与激光放大对比实验表明,脉冲ASE放大有利于抑制光谱非线性展宽,具有获得更高峰值功率的优势。三.用放大后的脉冲ASE泵浦光子晶体光纤,初步实验得到35W超连续谱输出。将ASE这种非相干光源引入超连续谱产生实验中,有助于深化对超连续谱产生机理的认识。
[Abstract]:In applications such as optical coherence tomography, low time coherence is required to obtain high imaging resolution. On the one hand, the amplified spontaneous emission (ASE) light source, as an incoherent light source, can satisfy this requirement; on the other hand, the ASE is used to pump the nonlinear medium to produce supercontinuum spectrum, which is characterized by its wide spectrum and low time coherence. It can meet more application requirements. In this paper, the generation and amplification of pulsed ASE light source and the process of producing supercontinuum spectrum for pumping photonic crystal fiber are studied. The main contents are as follows: 1. Nanosecond pulse ASE seed source was obtained. The output of 280MW continuous narrow band ASE is obtained by using optical fiber ring mirror structure, and the pulse width of 8ns, repetition frequency of 50kHz and average power of 50kHz are obtained by using AOM and EOM to modulate the continuous narrow-band ASE. II. The 49 W power output is obtained by using the main oscillatory power amplifier structure to amplify the pulse ASE. By changing the relative position of the 8 ns narrow band tip pulse in the 40ns substrate width pulse, the shape of the output pulse in time domain and the peak power of the output pulse are improved. Pulse ASE amplification is beneficial to the suppression of spectral nonlinear broadening and has the advantage of obtaining higher peak power. III. The photonic crystal fiber is pumped by amplified pulse ASE and the 35W supercontinuum spectrum is obtained by the preliminary experiment. The introduction of ASE as an incoherent light source into the experiment of supercontinuum spectrum generation will help to deepen the understanding of the mechanism of supercontinuum spectrum generation.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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