Nd:LYSO晶体新波长激光器
发布时间：2018-08-03 12:44
【摘要】：激光增益介质是激光器的核心部分,对激光工作物质的特性研究是固体激光器研究的主要组成部分。激光增益介质的吸收光谱和发射光谱是其重要的特性。一般来说,晶体的吸收光谱和发射光谱中心波长与掺杂的稀土离子有关,而谱线宽度则与工作物质本身特性有关,不同的晶格结构与离子位置导致了不同的特性。近几年来,无序晶体的研究引起了人们关注,其晶体结构的无序性使得光谱非均匀加宽,从而产生较宽的吸收和发射光谱。宽的吸收光谱降低了对特定波长泵浦源的依赖,发射光谱谱线增宽则能满足一些特定的需求。在众多无序晶体中,正硅酸盐材料具有独特的性质而被广泛关注。其稀土离子掺杂浓度高,化学、物理性质稳定,适合作为激光器中增益介质。掺钕硅酸钇镥晶体(Nd0.005Lu0.4975Y0.4975)2SiO5 (NdrLYSO)就是一种典型的硅酸盐类的无序晶体。本文研究了Nd:LYSO晶体的光谱特性,实现了其作为激光增益介质在1059.5nm和1359.5nm两个新波长激光器,并对激光特性进行了研究。本文的主要内容包括：1.实现了b切Nd:LYSO晶体作为激光增益介质的1059.5m新波长激光器连续输出以及主动调Q运转。研究了不同激光器谐振腔腔型对激光器连续输出功率的影响。研究了不同泵浦耦合光纤直径对激光器连续输出功率的影响。通过使用声光调Q模块,获得激光器1059.5 nm调Q脉冲输出,研究了平均输出功率、激光脉冲脉宽、单脉冲能量以及脉冲峰值功率随泵浦功率的变化。2.实现了b切Nd:LYSO晶体运转在1359.5 nm的激光器运转。研究了不同谐振腔腔型、输出镜透过率对连续输出功率的影响。对激光器运转在声光主动调Q模式下的性能进行了研究,包括激光器在不同调Q重复频率下的激光阈值、平均输出功率、单脉冲能量、脉冲宽度以及峰值功率。本论文的主要创新点如下：1.首次研究了无序晶体Nd:LYSO运转在1059.5 nm波长的激光特性,并使用声光调Q晶体首次实现了主动调Q的1059.5 nm光输出。2.首次实现了Nd:LYSO晶体的1359.5nm激光运转,研究了连续输出激光以及主动调Q激光的输出特性。
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
本文编号：2161787
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
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，本文编号：2161787
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