本文關(guān)鍵詞：石墨烯脈沖摻鉺光纖激光器的動(dòng)力學(xué)特性研究　出處：《河北師范大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 摻鉺光纖激光器 石墨烯 鎖模 調(diào)Q 矢量孤子 旋轉(zhuǎn) 鎖定 可調(diào)諧

【摘要】：脈沖摻鉺光纖激光器因其在光通信、材料加工、測(cè)量學(xué)、光纖傳感等領(lǐng)域的廣泛應(yīng)用而備受關(guān)注。調(diào)Q和鎖模是實(shí)現(xiàn)激光器脈沖輸出的兩種行之有效的方法。新興的可飽和吸收體—石墨烯,具有超快恢復(fù)時(shí)間、高損傷閾值、較大調(diào)制深度、較寬吸收帶寬及價(jià)格低廉等諸多優(yōu)點(diǎn)。本文利用實(shí)驗(yàn)研究的方法,對(duì)石墨烯脈沖摻鉺光纖激光器的動(dòng)力學(xué)特性進(jìn)行深入研究,具體研究?jī)?nèi)容和結(jié)果如下:1.從介紹鉺離子的能級(jí)結(jié)構(gòu)及其光譜吸收特性出發(fā),分別闡述了調(diào)Q和鎖模脈沖摻鉺光纖激光器的工作原理。2.在基于石墨烯摻鉺光纖激光器中,實(shí)驗(yàn)研究了矢量孤子的多個(gè)動(dòng)力學(xué)模式。觀察到了基孤子、孤子束、松或緊的孤子束縛態(tài)及孤子的高階諧波鎖模。通過(guò)仔細(xì)調(diào)節(jié)泵浦功率及諧振腔內(nèi)偏振控制器的狀態(tài),實(shí)驗(yàn)同時(shí)得到了上述各種模式的偏振鎖定和偏振旋轉(zhuǎn)狀態(tài),實(shí)現(xiàn)了兩種狀態(tài)之間的相互轉(zhuǎn)換,激光器的信噪比為51d B。到目前為止,還沒(méi)有關(guān)于基于石墨烯飽和吸收體的矢量孤子束縛態(tài)及高重復(fù)頻率矢量孤子諧波鎖模的研究報(bào)道。3.實(shí)驗(yàn)研究了全光纖、波長(zhǎng)可調(diào)、基于石墨烯飽和吸收體的調(diào)Q摻鉺光纖激光器。利用含可變光延遲線、臂長(zhǎng)不等的馬赫—曾德?tīng)柛缮鎯x作為光束濾波器,實(shí)現(xiàn)了工作波長(zhǎng)精確可調(diào),波長(zhǎng)可調(diào)范圍為35 nm。實(shí)驗(yàn)同時(shí)研究了調(diào)Q激光光脈沖的脈沖寬度和脈沖能量的特性,得到了最大能量為36.9 n J的高能量光脈沖。
[Abstract]:Pulsed erbium-doped fiber lasers are used in optical communication, material processing, and measurement. Q-switching and mode-locking are two effective methods to realize laser pulse output. Graphene, a new saturable absorber, has super fast recovery time. With the advantages of high damage threshold, large modulation depth, wide absorption bandwidth and low cost, the dynamic characteristics of graphene pulse erbium-doped fiber laser are studied in this paper. The specific contents and results are as follows: 1. The energy level structure and spectral absorption characteristics of erbium ions are introduced. The principle of Q-switched and mode-locked pulse erbium-doped fiber laser is described. In the graphene doped erbium-doped fiber laser, several dynamic modes of vector soliton are experimentally studied and the base soliton is observed. Soliton beams, loose or compact soliton bound states and higher-order harmonic mode-locking of solitons. The pump power and the state of the polarization controller in the resonator are carefully adjusted. At the same time, the polarization locking and polarization rotation states of the above modes are obtained, and the conversion between the two states is realized. The SNR of the laser is 51 dB. So far. There is no report on vector soliton bound state and high repetition frequency vector soliton harmonic mode-locking based on graphene saturated absorber. Q-switched erbium-doped fiber laser based on graphene saturated absorber. Using Mach Zehnder interferometer with variable optical delay line and different arm length as beam filter, the operating wavelength can be accurately adjusted. The wavelength adjustable range is 35 nm. The characteristics of pulse width and pulse energy of Q-switched laser pulses are also studied. A high energy optical pulse with the maximum energy of 36.9 nJ is obtained.
【學(xué)位授予單位】：河北師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN248

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本文編號(hào)：1387202