本文關(guān)鍵詞： 高功率光纖激光器 雙包層光纖 功率對準系統(tǒng) 光-光轉(zhuǎn)換效率 光束質(zhì)量　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：為了提高高功率光纖激光器中雙包層光纖的熔接質(zhì)量,解決由于熔接點處纖芯錯位導(dǎo)致的激光器系統(tǒng)光-光轉(zhuǎn)換效率降低,光束質(zhì)量變差等問題,研究了雙包層光纖的光功率對準技術(shù)�；诮�(jīng)典波動理論與模式傳播理論,分析了雙包層光纖纖芯中只傳播基模和存在高階模時纖芯偏移與熔接點處耦合效率的關(guān)系,使用nufern 20/400大模場雙包層光纖搭建對準系統(tǒng),對系統(tǒng)的光源和模場匹配特性進行實驗研究,并驗證包層光和纖芯中的高階模對耦合效率與徑向偏移關(guān)系的影響,實驗與理論結(jié)果表明,纖芯中的高階模使耦合效率對徑向偏移變化的敏感度降低。根據(jù)以上研究,優(yōu)化了雙包層光纖熔接的功率對準系統(tǒng),提高了雙包層光纖熔接的對準精度。理論研究了雙包層光纖熔接時纖芯偏移對光束質(zhì)量的影響。針對經(jīng)典波動模型存在模式耦合過程不明顯、計算復(fù)雜等問題,提出了模場耦合追蹤模型。該模型是采用高斯變形形式表示模場的耦合過程計算不同纖芯偏移時的M2。實驗測量了 mufem 20/400雙包層光纖光束質(zhì)量隨熔接偏移量的變化關(guān)系,測量結(jié)果和理論模型吻合。采用模場耦合追蹤模型,能夠更高效的計算光束質(zhì)量隨光纖偏移的變化。采用雙包層光纖熔接的對準系統(tǒng)研究熔接機設(shè)置參數(shù)與熔接點質(zhì)量的關(guān)系,找到最佳熔接參數(shù),使熔接點質(zhì)量最優(yōu)�；谠撓到y(tǒng)構(gòu)建了千瓦級雙端泵光纖激光器系統(tǒng),光-光轉(zhuǎn)換效率大于73%,光束質(zhì)量優(yōu)于1.22,實現(xiàn)了準單模輸出。
[Abstract]:In order to improve the fusion quality of double-clad fiber in high-power fiber laser, the problems of optical conversion efficiency and beam quality of laser system caused by misalignment of fiber core at fusion point are solved. The optical power alignment technology of double-clad fiber is studied based on classical wave theory and mode propagation theory. The relationship between core offset and coupling efficiency at fusion point is analyzed when only the base mode is propagated in double-clad fiber core and the higher-order mode exists. The alignment system is built with nufern 20/400 large-mode double-cladding fiber. The matching characteristics of light source and mode field are studied experimentally, and the effect of high order mode in cladding light and fiber core on coupling efficiency and radial offset is verified. The experimental and theoretical results show that. The high order mode in the core reduces the sensitivity of coupling efficiency to radial deviation. Based on the above research, the power alignment system of double-clad fiber fusion is optimized. The alignment accuracy of double-clad fiber fusion is improved. The influence of core offset on beam quality is studied theoretically. The classical wave model has some problems such as the mode coupling process is not obvious and the calculation is complex. A mode field coupling tracing model is proposed, in which the coupling process of the mode field represented by Gao Si's deformation form is used to calculate the M2 of different core deviations. The mufem is measured experimentally. The relationship between beam quality and weld offset of 20/400 double-clad fiber. The measurement results are in agreement with the theoretical model. The mode field coupled tracking model is used. The alignment system of double-clad fiber welding is used to study the relationship between the parameters of welding machine and the quality of weld point, and find the best welding parameters. Based on this system, a kilowatt level dual-end pump fiber laser system is constructed. The optical to optical conversion efficiency is greater than 73 and the beam quality is better than 1.22. The quasi-single-mode output is realized.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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