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  本文選題：Er:YAG激光器　切入點：石墨烯　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：工作波長為1.6μm的脈沖激光與其他波段激光相比,因其位于“人眼安全”波段,同時也是大氣的傳輸窗口,在激光雷達、激光測距及空間自由通訊等領域有著廣泛的應用和良好的發(fā)展前景。不僅如此,該波段激光還可以通過非線性頻率轉換技術獲得3-5μm的中紅外激光。近年來,如何產生線寬窄、轉換效率高、光束質量好的1.6μm脈沖激光已經成為國內外研究熱點。在眾多產生1.6μm激光的解決方案中,采用激光二極管共振抽運Er:YAG固體激光器是目前最為理想的方式之一。調Q技術的產生是是激光發(fā)展史上的一個重要突破,滿足特定應用領域對激光峰值功率和脈沖寬度等方面提出的更高要求。論文的實驗部分分別基于被動調Q和主動調Q兩種方法,采用1532 nm激光二極管作為泵浦源,實現(xiàn)了1645 nmEr:YAG調Q脈沖激光的產生。首先研究了基于石墨烯被動調Q的Er:YAG固體激光器。作為近年來涌現(xiàn)的新型二維材料,與其他可飽和吸收體相比,石墨烯展示出寬波段吸收、高損傷閾值、超快恢復時間和低飽和強度等優(yōu)異性能,在作為激光器的可飽和吸收體方面具有極大的應用前景。實驗中,沉積在石英片上的單層石墨烯插入激光諧振腔內充當可飽和吸收體。在最大入射泵浦功率為20.8 W時,獲得了高脈沖能量窄譜線線寬的1645 nm脈沖激光輸出,單脈沖能量和譜線線寬分別為13.5μJ和0.13 nm。其中,13.5μJ的輸出脈沖能量約為之前報導的基于石墨烯調Q的Er:YAG激光器的兩倍。主動調Q方面,基于RTP電光晶體采用加壓式電光調Q方法對Er:YAG調Q激光器的輸出特性進行了詳細的實驗研究。在1 kHz重復頻率下,當泵浦功率增加到21.6 W時,輸出功率達到最大值2.23 W,脈沖寬度和脈沖能量分別為170 ns和2.23 mJ。
[Abstract]:Compared with other wavebands, the pulsed laser with a working wavelength of 1.6 渭 m is located in the "human eye safety" band and is also an atmospheric transmission window in the lidar. Laser ranging and space free communication are widely used and have good prospects. Not only that, the laser in this band can also obtain 3-5 渭 m mid-infrared laser by nonlinear frequency conversion technology. In recent years, how to produce narrow line, The 1.6 渭 m pulsed laser with high conversion efficiency and good beam quality has become a research hotspot at home and abroad. Using laser diode resonance pumped Er:YAG solid-state laser is one of the most ideal methods at present. The emergence of Q-switched technology is an important breakthrough in the history of laser development. The experiment part of this paper is based on passive Q-switching and active Q-switching, and 1532nm laser diode is used as pump source. The generation of 1645 nmEr:YAG Q-switched pulse laser is realized. Firstly, Er:YAG solid-state laser based on graphene passively Q-switched is studied. As a new two-dimensional material, graphene exhibits wide band absorption compared with other saturable absorbers. High damage threshold, ultra-fast recovery time and low saturation intensity have great application prospects as saturable absorbers of lasers. Monolayer graphene deposited on a quartz wafer is inserted into a laser resonator as a saturable absorber. At a maximum incident pump power of 20.8 W, a 1645 nm pulsed laser with a narrow line width of high pulse energy is obtained. The single pulse energy and line width are 13.5 渭 J and 0.13 nm respectively. The output pulse energy of 13.5 渭 J is about twice that of the previously reported Er:YAG laser based on graphene Q-switched. The output characteristics of Er:YAG Q-switched laser are studied by using the pressurized electro-optic Q-switching method based on RTP electro-optic crystal. When the pump power is increased to 21.6 W at 1 kHz repetition rate, the output characteristics of Er:YAG Q-switched laser are studied in detail. The maximum output power is 2.23 W, the pulse width and pulse energy are 170 ns and 2.23 mJ, respectively.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248.1

【參考文獻】

相關期刊論文 前2條

1 王琪潔;張勇;劉小力;;改進的Malkmus帶模式晴空大氣透射率計算方法(英文)[J];Transactions of Nonferrous Metals Society of China;2014年08期

2 時順森,金鋒,翟剛,李晶,馬楠;高重頻人眼安全波段OPO激光器[J];光電對抗與無源干擾;1998年04期

相關碩士學位論文 前1條

1 孫曉桁;1.6μm摻鉺固體激光器激光特性研究[D];哈爾濱工業(yè)大學;2011年

，

本文編號：1557199