脈沖ASE光源泵浦光子晶體光纖產(chǎn)生超連續(xù)譜
本文選題:脈沖ASE + 放大 ; 參考:《國防科學(xué)技術(shù)大學(xué)》2015年碩士論文
【摘要】:在諸如光學(xué)相干層析技術(shù)等應(yīng)用中,要求光源具有低時(shí)間相干性,以獲得高成像分辨率。一方面,放大的自發(fā)輻射(ASE)光源作為一種非相干光源,自身可以滿足這樣的要求;另一方面,ASE用于泵浦非線性介質(zhì)產(chǎn)生超連續(xù)譜,以其寬光譜和低時(shí)間相干性的特點(diǎn),可以滿足更多的應(yīng)用需求。本文對脈沖ASE光源的產(chǎn)生、放大以及用于泵浦光子晶體光纖產(chǎn)生超連續(xù)譜的過程開展研究,主要內(nèi)容包括:一.獲得了納秒脈沖ASE種子源。采用光纖環(huán)形反射鏡結(jié)構(gòu)提高帶內(nèi)功率,得到280 mW連續(xù)窄譜帶ASE輸出;利用AOM和EOM共同調(diào)制連續(xù)窄譜帶ASE,得到脈寬8 ns、重頻50 kHz、平均功率50?W的脈沖ASE。二.采用主振蕩功率放大結(jié)構(gòu)放大脈沖ASE,獲得49W功率輸出。通過改變種子脈沖中8 ns窄帶尖脈沖在40 ns基底寬脈沖的相對位置,改善輸出脈沖時(shí)域形狀并提升其峰值功率;與激光放大對比實(shí)驗(yàn)表明,脈沖ASE放大有利于抑制光譜非線性展寬,具有獲得更高峰值功率的優(yōu)勢。三.用放大后的脈沖ASE泵浦光子晶體光纖,初步實(shí)驗(yàn)得到35W超連續(xù)譜輸出。將ASE這種非相干光源引入超連續(xù)譜產(chǎn)生實(shí)驗(yàn)中,有助于深化對超連續(xù)譜產(chǎn)生機(jī)理的認(rèn)識。
[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.
【學(xué)位授予單位】:國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN253
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