【摘要】：激光增益介質(zhì)是激光器的核心部分,對激光工作物質(zhì)的特性研究是固體激光器研究的主要組成部分。激光增益介質(zhì)的吸收光譜和發(fā)射光譜是其重要的特性。一般來說,晶體的吸收光譜和發(fā)射光譜中心波長與摻雜的稀土離子有關(guān),而譜線寬度則與工作物質(zhì)本身特性有關(guān),不同的晶格結(jié)構(gòu)與離子位置導致了不同的特性。近幾年來,無序晶體的研究引起了人們關(guān)注,其晶體結(jié)構(gòu)的無序性使得光譜非均勻加寬,從而產(chǎn)生較寬的吸收和發(fā)射光譜。寬的吸收光譜降低了對特定波長泵浦源的依賴,發(fā)射光譜譜線增寬則能滿足一些特定的需求。在眾多無序晶體中,正硅酸鹽材料具有獨特的性質(zhì)而被廣泛關(guān)注。其稀土離子摻雜濃度高,化學、物理性質(zhì)穩(wěn)定,適合作為激光器中增益介質(zhì)。摻釹硅酸釔镥晶體(Nd0.005Lu0.4975Y0.4975)2SiO5 (NdrLYSO)就是一種典型的硅酸鹽類的無序晶體。本文研究了Nd:LYSO晶體的光譜特性,實現(xiàn)了其作為激光增益介質(zhì)在1059.5nm和1359.5nm兩個新波長激光器,并對激光特性進行了研究。本文的主要內(nèi)容包括：1.實現(xiàn)了b切Nd:LYSO晶體作為激光增益介質(zhì)的1059.5m新波長激光器連續(xù)輸出以及主動調(diào)Q運轉(zhuǎn)。研究了不同激光器諧振腔腔型對激光器連續(xù)輸出功率的影響。研究了不同泵浦耦合光纖直徑對激光器連續(xù)輸出功率的影響。通過使用聲光調(diào)Q模塊,獲得激光器1059.5 nm調(diào)Q脈沖輸出,研究了平均輸出功率、激光脈沖脈寬、單脈沖能量以及脈沖峰值功率隨泵浦功率的變化。2.實現(xiàn)了b切Nd:LYSO晶體運轉(zhuǎn)在1359.5 nm的激光器運轉(zhuǎn)。研究了不同諧振腔腔型、輸出鏡透過率對連續(xù)輸出功率的影響。對激光器運轉(zhuǎn)在聲光主動調(diào)Q模式下的性能進行了研究,包括激光器在不同調(diào)Q重復頻率下的激光閾值、平均輸出功率、單脈沖能量、脈沖寬度以及峰值功率。本論文的主要創(chuàng)新點如下：1.首次研究了無序晶體Nd:LYSO運轉(zhuǎn)在1059.5 nm波長的激光特性,并使用聲光調(diào)Q晶體首次實現(xiàn)了主動調(diào)Q的1059.5 nm光輸出。2.首次實現(xiàn)了Nd:LYSO晶體的1359.5nm激光運轉(zhuǎn),研究了連續(xù)輸出激光以及主動調(diào)Q激光的輸出特性。
[Abstract]:The laser gain medium is the core part of the laser, and the study of the characteristics of the laser working material is the main part of the solid-state laser research. The absorption and emission spectra of laser gain medium are important properties. Generally speaking, the central wavelength of absorption and emission spectra of crystals is related to the doped rare earth ions, while the width of spectral lines is related to the properties of the working matter itself. Different lattice structures and ion positions lead to different characteristics. In recent years, the study of disordered crystals has attracted much attention. The disordered structure of disordered crystals results in a wide absorption and emission spectra. The wide absorption spectrum reduces the dependence of the pump source at a specific wavelength, and the broadening of the emission spectrum line can meet some specific requirements. Among many disordered crystals, orthosilicate materials have been paid more and more attention due to their unique properties. Its rare earth ion doping concentration is high, the chemical and physical properties are stable, and it is suitable for the gain medium in laser. Neodymium doped lutetium yttrium silicate (Nd0.005Lu0.4975Y0.4975) 2SiO5 (NdrLYSO) is a typical disordered silicate crystal. In this paper, the spectral characteristics of Nd:LYSO crystal are studied. As a gain medium, two new wavelength lasers, 1059.5nm and 1359.5nm, have been realized, and the laser characteristics have been studied. The main contents of this paper include: 1. The continuous output of 1059.5 m new wavelength laser with b cut Nd:LYSO crystal as the gain medium and the active Q-switched operation are realized. The influence of different cavity types on the output power of the laser is studied. The influence of different pump fiber diameters on the continuous output power of the laser is studied. The laser 1059.5 nm Q-switched pulse output is obtained by using acousto-optic Q-switched module. The average output power, laser pulse width, single pulse energy and pulse peak power with pump power are studied. The laser with b-cut Nd:LYSO crystal running at 1359.5 nm has been realized. The influence of the transmittance of the output mirror on the continuous output power with different cavity types is studied. The performance of laser in acousto-optic Q-switched mode is studied, including laser threshold, average output power, monopulse energy, pulse width and peak power at different Q-switched repetition rates. The main innovations of this thesis are as follows: 1. The laser characteristics of disordered Nd:LYSO operating at 1059.5 nm have been studied for the first time, and the 1059.5 nm light output of active Q-switching has been realized by using acousto-optic Q-switched crystal for the first time. The 1359.5nm laser operation of Nd:LYSO crystal is realized for the first time. The output characteristics of continuous output laser and active Q-switched laser are studied.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

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本文編號：2161787