本文選題：中紅外光纖激光器 + 主動調(diào)Q��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：中紅外激光器一直是激光研究領(lǐng)域的熱點(diǎn),在國防、生物醫(yī)學(xué)、大氣環(huán)境監(jiān)測等領(lǐng)域具有廣闊的應(yīng)用前景。中紅外光纖激光器是近幾年發(fā)展起來的新技術(shù),與傳統(tǒng)的固體和氣體激光器相比,具有光束質(zhì)量好、散熱性好、轉(zhuǎn)換效率高、結(jié)構(gòu)簡單等諸多優(yōu)點(diǎn)。與連續(xù)輸出的光纖激光器相比,調(diào)Q脈沖光纖激光器可以在不太高的平均功率下獲得更高的峰值功率和脈沖能量,因此發(fā)展中紅外調(diào)Q脈沖光纖激光器在工業(yè)加工、激光醫(yī)療、和光電對抗等領(lǐng)域具有更為重要的應(yīng)用價(jià)值。目前,國內(nèi)外已有大量關(guān)于中紅外調(diào)Q脈沖光纖激光器的實(shí)驗(yàn)報(bào)道,但相關(guān)理論研究的報(bào)導(dǎo)卻較少。因此本文工作主要如下:1.建立了基于高濃度摻Er3+ZBLAN光纖的主動調(diào)Q光纖激光器和低濃度摻Ho3+ZBLAN級聯(lián)光纖的主動調(diào)Q光纖激光器的理論數(shù)值模型,模擬分析了纖芯半徑,泵浦功率,重復(fù)頻率,光纖損耗,光纖長度,聲光效率等對調(diào)Q脈沖輸出特性的影響。結(jié)果表明對高濃度摻Er3+光纖采取前向泵浦方式,對低濃度摻Ho3+光纖采取雙向泵浦方式會引起各自脈沖能量,峰值功率和存儲能量上升,脈沖寬度減小;提高泵浦功率或減小重復(fù)頻率能輸出更高能量,更窄脈寬,更高峰值功率的脈沖并增加光纖存儲能量;光纖纖芯半徑較大會引起脈沖能量,脈沖寬度和存儲能量上升,峰值功率下降;光纖長度過長會引起脈沖能量下降,脈沖寬度上升和脈沖建立時(shí)間的增加;光纖激光器內(nèi)的損耗(AOM損耗,光纖損耗,輸出耦合損耗)都會引起輸出能量和峰值功率下降,但對脈沖寬度沒有影響。2.通過理論優(yōu)化設(shè)計(jì),首先搭建了主動調(diào)Q摻Ho3+ZBLAN級聯(lián)光纖激光器,實(shí)現(xiàn)了高能量、高功率的雙波段3μm和2μm的脈沖穩(wěn)定激光輸出。其中3μm波段脈沖激光在重復(fù)頻率25kHz處得到最高峰值功率為78W,最大脈沖能量29.8μJ,而2μm波段脈沖在重復(fù)頻率17kHz處得到最高峰值功率49W,最大脈沖能量9.2μJ。其次,搭建了主動調(diào)Q導(dǎo)引增益調(diào)制脈沖光纖激光器,通過對平面光柵的調(diào)節(jié)實(shí)現(xiàn)了波長調(diào)諧范圍在2.95μm到3.031μm的5I6→5I7躍遷的脈沖激光輸出和2μm波段的穩(wěn)定脈沖增益調(diào)制輸出。當(dāng)重復(fù)頻率為40kHz時(shí),得到了最大脈沖能量17μJ,最大峰值功率43W,脈沖寬度410ns的3μm波段脈沖激光輸出,對應(yīng)的2μm波段脈沖的最大脈沖能量為3.7μJ,脈沖寬度為550ns,并且輸出波長基本不變。
[Abstract]:The mid-infrared laser has been a hot spot in the field of laser research, and has a broad application prospect in the fields of national defense, biomedicine, atmospheric environment monitoring and so on.The mid-infrared fiber laser is a new technology developed in recent years. Compared with conventional solid-state and gas lasers, it has many advantages, such as better beam quality, better heat dissipation, higher conversion efficiency and simpler structure.Compared with continuous output fiber laser, Q-switched pulse fiber laser can obtain higher peak power and pulse energy at low average power, so developing infrared Q-switched pulse fiber laser is in industrial processing, laser medical treatment,And optoelectronic countermeasures and other fields have more important application value.At present, there have been a lot of experimental reports about the external Q-switched pulse fiber lasers, but there are few reports on the related theoretical studies.Therefore, the main work of this paper is as follows: 1.The theoretical numerical models of the active Q-switched fiber laser based on high concentration Er3 ZBLAN fiber and the low concentration Ho3 ZBLAN cascade fiber are established. The core radius, pump power, repetition rate and fiber loss are simulated and analyzed.The effects of fiber length and acoustooptic efficiency on the output characteristics of Q-switched pulses.The results show that using forward pumping mode for high concentration Er3 doped fiber and bidirectional pumping mode for low concentration Ho3 doped fiber will lead to the increase of pulse energy peak power and storage energy and decrease of pulse width.Increasing pump power or reducing repetition rate can output higher energy, narrower pulse width, higher peak power and increase storage energy of fiber. Larger radius of fiber core will cause pulse energy, pulse width and storage energy increase.The peak power is decreased, the length of the fiber is too long, the pulse energy will decrease, the pulse width will rise and the pulse establishment time will be increased, the loss of AOM in fiber laser, the loss of fiber, the loss of fiber, the loss of AOM in fiber laser,The output coupling loss) will cause the output energy and peak power to decrease, but has no effect on the pulse width.Through the theoretical optimization design, the active Q-switched Ho3 ZBLAN cascaded fiber laser is first built, and the pulse stabilized laser output of 3 渭 m and 2 渭 m is realized with high energy and high power.The maximum peak power of 3 渭 m band pulse laser is 78 W and the maximum pulse energy is 29.8 渭 J at the repetition rate 25kHz, while the maximum peak power is 49 W and the maximum pulse energy is 9.2 渭 J. at the repetition rate 17kHz at 2 渭 m band, the maximum peak power of the laser is 78 W and the maximum pulse energy is 29.8 渭 J.Secondly, an active Q-switched guided gain modulated pulsed fiber laser is built. By adjusting the plane grating, the wavelength tuning range from 2.95 渭 m to 3.031 渭 m 5I6 5I7 transition pulse laser output and 2 渭 m band stable pulse gain modulation output are achieved.When the repetition rate is 40kHz, the maximum pulse energy is 17 渭 J, the maximum peak power is 43 W, the pulse width is 3 渭 m band laser output of 410ns, the maximum pulse energy of 2 渭 m band pulse is 3.7 渭 J, the pulse width is 550 ns, and the output wavelength is almost unchanged.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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