本文關鍵詞：1.9μm Tm激光抽運Ho：YAG激光器研究　出處：《長春理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： Tm:YLF 激光器 Ho:YAG 激光器 體光柵

【摘要】：2μm人眼安全激光處于大氣窗口,可廣泛應用于激光醫(yī)療、激光雷達、環(huán)境監(jiān)測及光通信等領域;此外,2μm激光還可以作為3~5μm寬帶可調(diào)諧中紅外光參量振蕩器的高效泵浦光。Ho:YAG晶體是產(chǎn)生高性能2μm激光的首選晶體之一,為了盡快獲取高功率、高效率的2μm激光輸出,本文開展了2.1μm Ho:YAG激光器及其泵浦源1.9μm Tm:YLF激光器的理論與實驗研究。理論方面,首先根據(jù)Ho:YAG晶體的物理、機械及光譜特性,闡述了2.1μm Ho:YAG激光器的運轉(zhuǎn)機制;然后依據(jù)Ho3+的躍遷機制,建立了考慮Ho-Ho上轉(zhuǎn)換的準二能級速率方程模型,并依據(jù)此模型對激光器閾值、輸出功率進行了求解;最后理論模擬并分析了上轉(zhuǎn)換損耗、輸出鏡透過率、泵浦-激光模式比以及晶體參數(shù)對Ho:YAG激光器的影響,為后續(xù)激光器的設計與實驗提供理論指導。實驗方面,首先搭建了LD單端抽運Tm:YLF激光器,并依次研究了輸出鏡透過率、曲率半徑及諧振腔長對輸出特性的影響,以此選取了最佳的實驗參數(shù);其次,開展了以平面鍍膜全反鏡為腔鏡的單LD雙端抽運Tm:YLF激光器實驗,獲得了9.6W的1908nm激光輸出,斜率效率和光光轉(zhuǎn)換效率分別為35.9%和29%,線寬大于2nm,且輸出波長隨著注入功率增加從1908.2nm紅移至1909.8nm;接著使用鍍膜體光柵代替平面鍍膜全反鏡,實現(xiàn)了8.8W的1908.2nm激光輸出,線寬僅為0.2nm,且波長紅移不超過0.6nm。然后,開展了單程抽運Ho:YAG激光器實驗,分別研究了輸出鏡透過率、曲率半徑及諧振腔長對2.1μm激光輸出特性的影響,在最佳輸出條件下獲得了4.6W的2122nm激光輸出,線寬僅為0.2nm,斜率效率和光光轉(zhuǎn)換效率分別為68.1%和53.2%;最后,根據(jù)實驗結(jié)果分析,提出了高功率、高效率Ho:YAG激光器的設計方案。
[Abstract]:2 渭 m human eye safe laser is in the air window, which can be widely used in the fields of laser medical treatment, lidar, environmental monitoring and optical communication. In addition, the 2 渭 m laser can be used as the high efficiency pump light of 3 5 渭 m broadband tunable medium infrared parametric oscillator. How: YAG crystal is one of the preferred crystals to produce 2 渭 m laser with high performance. In order to obtain high power and high efficiency 2 渭 m laser output as soon as possible. In this paper, the theoretical and experimental studies of the 2.1 渭 m Ho:YAG laser and its pumping source of 1.9 渭 m Tm:YLF laser have been carried out. In theory, firstly, according to the physics of Ho:YAG crystal. Mechanical and spectral characteristics, the operating mechanism of 2.1 渭 m Ho:YAG laser is described. Then, according to the transition mechanism of Ho3, the quasi-two-level rate equation model considering Ho-Ho upconversion is established, and the threshold and output power of the laser are solved according to this model. Finally, the effects of up-conversion loss, output mirror transmittance, pump-laser mode ratio and crystal parameters on Ho:YAG laser are simulated and analyzed theoretically. It provides theoretical guidance for the design and experiment of the following laser. In the experimental aspect, the LD single-end pumped Tm:YLF laser is first built, and the transmittance of the output mirror is studied in turn. The influence of curvature radius and resonator length on the output characteristics is obtained, and the optimum experimental parameters are selected. Secondly, the experiment of single-LD double-end pumped Tm:YLF laser with planar coating mirror as mirror is carried out, and the output of 9.6W 1908nm laser is obtained. The slope efficiency and optical conversion efficiency are 35.9% and 29 respectively, the linewidth is larger than 2 nm, and the output wavelength shifts from 1908.2 nm to 1909.8 nm with the increase of injection power. Then, the thin body grating is used instead of the plane coating mirror, and the output of 1908.2 nm laser is realized. The line width is only 0.2 nm, and the wavelength red shift is not more than 0.6 nm. The experiment of single-pass pumped Ho:YAG laser is carried out. The effects of the transmittance of output mirror, the radius of curvature and the length of resonator on the output characteristics of 2.1 渭 m laser are studied. Under the optimum output conditions, the output of 4.6W 2122 nm laser is obtained. The linewidth is only 0.2 nm, the slope efficiency and optical conversion efficiency are 68.1% and 53.2 nm, respectively. Finally, according to the analysis of experimental results, the design scheme of high power and high efficiency Ho:YAG laser is proposed.
【學位授予單位】：長春理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

【共引文獻】

相關碩士學位論文 前1條

1 張瑜;單LD雙端抽運Tm:YLF連續(xù)激光器的研究[D];長春理工大學;2013年

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本文編號：1403266