本文選題：光纖激光器 + 摻Nd~(3+)光子晶體光纖�。� 參考：《濟(jì)南大學(xué)》2017年碩士論文

【摘要】：釹離子(Nd~(3+))是最早用于激光器的三價稀土離子,可采用激光二極管(LD)泵浦,已在上百種不同基質(zhì)材料中獲得了受激發(fā)射,在軍事、工業(yè)、生物、醫(yī)療和科學(xué)研究等領(lǐng)域有廣泛應(yīng)用。摻Nd~(3+)光纖激光器具有結(jié)構(gòu)緊湊、穩(wěn)定性高、抗干擾性好、光束質(zhì)量高等優(yōu)勢,一直是科學(xué)領(lǐng)域的研究熱點之一。目前,普通單模摻Nd~(3+)光纖激光器的輸出功率大多在毫瓦量級。普通雙包層摻Nd~(3+)光纖激光器雖然可以實現(xiàn)高功率激光輸出,但容易產(chǎn)生多模運轉(zhuǎn),導(dǎo)致光束質(zhì)量下降。這種缺陷可以在光子晶體光纖中通過合理的結(jié)構(gòu)設(shè)計予以消除,同時發(fā)揮大模場面積、無截止單模特性兩方面的優(yōu)勢。本論文基于摻Nd~(3+)大模場雙包層保偏光子晶體光纖,研究獲得1.06μm波段高功率、高光束質(zhì)量連續(xù)波激光以及高能量鎖模脈沖激光的方法和途徑。主要研究內(nèi)容如下:1.研究了摻Nd~(3+)大模場雙包層保偏光子晶體光纖的光譜特性,并根據(jù)光纖包層中的空氣孔的大小及周期間隔等參數(shù),分析了摻Nd~(3+)光子晶體光纖的模式特性、色散特性、偏振特性、非線性效應(yīng)和損耗特性,為激光器設(shè)計提供了依據(jù)和指導(dǎo)。2.研究了LD抽運摻Nd~(3+)大模場雙包層保偏光子晶體光纖的連續(xù)波激光特性,最大輸出功率為5.95W,光束質(zhì)量M2因子小于1.30,偏振串音為-7.9dB,這表明摻Nd~(3+)大模場雙包層保偏光子晶體光纖具有良好的單模傳輸特性和保偏特性,有利于激光器實現(xiàn)高功率高光束質(zhì)量的激光輸出。3.基于全正色散腔,研究了摻Nd~(3+)大模場雙包層保偏光子晶體光纖的鎖模激光特性。采用半導(dǎo)體可飽和吸收鏡(SESAM)鎖模元件,在腔內(nèi)不加任何色散補(bǔ)償元件的情況下,實現(xiàn)了1μm波段鎖模激光運轉(zhuǎn),脈沖寬度為73.1ps,最大平均輸出功率為236.8mW,對應(yīng)的單脈沖能量為17.3nJ。這表明摻Nd~(3+)大模場雙包層保偏光子晶體光纖可以有效較低非線性效應(yīng),有利于獲得高能量的鎖模脈沖激光輸出。4.設(shè)計了基于摻Nd~(3+)大模場雙包層保偏光子晶體光纖的激光放大器,采用自搭建Nd:YVO4晶體連續(xù)波激光器提供種子源,實現(xiàn)了連續(xù)波激光放大,最大輸出功率為8.75W。本論文有關(guān)摻Nd~(3+)保偏光子晶體光纖高功率連續(xù)波激光、鎖模脈沖激光以及激光放大的研究結(jié)論,對該領(lǐng)域研究工作的進(jìn)一步開展具有很好的參考價值和推動作用。
[Abstract]:Neodymium (ND) is the first trivalent rare earth ion used in lasers. It can be pumped by laser diode (LD). It has been stimulated in hundreds of different matrix materials, and has been used in military, industrial and biological fields. Medical and scientific research and other fields have a wide range of applications. Fiber laser doped with Nd~(3 has many advantages such as compact structure, high stability, good anti-jamming and high beam quality, so it has been one of the research hotspots in the field of science. At present, the output power of ordinary single mode doped Nd~(3) fiber laser is mostly in milliwatt order. Although the conventional double-clad Nd~(3) fiber laser can achieve high power laser output, it is easy to produce multi-mode operation, which leads to the deterioration of beam quality. This defect can be eliminated by reasonable structure design in photonic crystal fiber, and the advantages of large mode field area and no cut-off single mode characteristic can be taken into account at the same time. In this paper, the method and approach of 1.06 渭 m high power, high beam quality CW laser and high energy mode-locked pulse laser are studied based on the large mode field dual-clad photonic crystal fiber doped with Nd~(3. The main research contents are as follows: 1. In this paper, the spectral characteristics of Nd~(3) large mode field double cladding polarization-maintaining photonic crystal fiber are studied. Based on the parameters such as air hole size and periodic interval in the fiber cladding, the mode characteristics and dispersion characteristics of Nd~(3 doped photonic crystal fiber are analyzed. Polarization characteristics, nonlinear effects and loss characteristics provide basis and guidance for laser design. The CW laser characteristics of LD pumped Nd~(3 doped large mode double cladding polarization-maintaining photonic crystal fiber are studied. The maximum output power is 5.95 W, the beam quality M2 factor is less than 1.30, and the polarization crosstalk is -7.9 dB, which indicates that the dual-clad polarization-maintaining photonic crystal fiber doped with Nd~(3) has good single-mode propagation and polarization-maintaining characteristics. The laser output of high power and high beam quality is favorable to laser output. 3. Based on the fully positive dispersion cavity, the mode-locked laser characteristics of a large-mode dual-cladding polarization-maintaining photonic crystal fiber doped with Nd~(3 are studied. A 1 渭 m band mode-locked laser with a pulse width of 73.1 pss. maximum average output power of 236.8 MW and a corresponding single pulse energy of 17.3 nJ have been realized by using a semiconductor saturable absorption mirror SESAM mode-locking element without adding any dispersion compensation elements in the cavity. The results show that the large mode field double cladding photonic crystal fiber doped with Nd~(3 can effectively reduce the nonlinear effect and is advantageous to obtain high energy mode-locked pulse laser output .4. A laser amplifier based on large mode field double cladding photonic crystal fiber is designed. The self-constructed Nd:YVO4 crystal CW laser is used to provide seed source and the maximum output power is 8.75 W. In this paper, the research results of high power CW laser, mode-locked pulse laser and laser amplification of Nd~(3 doped photonic crystal fiber have good reference value and impetus for further research work in this field.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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本文編號：1971284