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首页> 外文学位 >Spectroscopic characterization and 3-micrometer CW laser operation of erbium(3+):gadolinium(3) gallium(5) oxygen(12) and erbium(3+):yttrium(3) scandium(2) gallium(3) oxygen(12).
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Spectroscopic characterization and 3-micrometer CW laser operation of erbium(3+):gadolinium(3) gallium(5) oxygen(12) and erbium(3+):yttrium(3) scandium(2) gallium(3) oxygen(12).

机译：（（3 +）：ga（3）镓（5）氧（12）和（3+）：钇（3）dium（2）氧（12）的光谱表征和3微米连续激光操作）。

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摘要

The spectroscopic and 3-{dollar}mu{dollar}m laser properties of {dollar}rm Ersp{lcub}3+{rcub}{lcub}:{rcub}Gdsb3Gasb5Osb{lcub}12{rcub}{dollar} and {dollar}rm Ersp{lcub}3+{rcub}{lcub}:{rcub}Ysb3Scsb2Gasb3Osb{lcub}12{rcub}{dollar} are investigated. The Judd-Ofelt Theory is applied to calculate radiative lifetimes, branching ratios, and radiative quantum efficiencies. The results reveal radiative lifetimes significantly longer than those actually observed for the {dollar}rmsp4Isb{lcub}11/2{rcub}, sp4Isb{lcub}9/2{rcub}{dollar}, and {dollar}rmsp4Ssb{lcub}3/2{rcub}{dollar} states, which indicate that strong quenching processes operate in these media. Radiative quantum efficiencies of 24% and 32% are observed from the {dollar}rmsp4Isb{lcub}11/2{rcub}{dollar} state for GGG and YSGG, respectively.; The role of upconversion is examined in an experiment in which the luminescence which occurs from the {dollar}rmsp4Ssb{lcub}3/2{rcub}{dollar} and {dollar}rmsp4Isb{lcub}9/1{rcub}{dollar} states following chopped, cw pumping is analyzed in two time domains: that resulting from direct excitation and that resulting following upconversion-induced excitation. The ratio of upconversion-induced luminescence to pump-induced luminscence is quantified and applied to a simplified rate model, from which values of the {dollar}rmsp4Isb{lcub}13/2{rcub}{dollar} and {dollar}rmsp4Isb{lcub}11/2{rcub}{dollar} upconversion coefficients, {dollar}alphasb1{dollar} and {dollar}alphasb2{dollar}, are calculated. The calculated {dollar}alphasb1{dollar} is typically larger than the calculated {dollar}alphasb2{dollar}, which partially explains the mechanism by which cw laser oscillation occurs.; The 3-{dollar}mu{dollar}m laser properties of Er:GGG and Er:YSGG are investigated using monolithic laser resonators. The lasers are pumped directly into the {dollar}rmsp4Isb{lcub}11/2{rcub}{dollar} upper state near 0.97 {dollar}mu{dollar}m by either a Ti:sapphire or InGaAs diode laser. Greater than 0.5-W of 2.79-{dollar}mu{dollar}m laser emission and nearly 0.3-W of 2.82-{dollar}mu{dollar}m emission are observed from diode-pumped Er:YSGG and Er:GGG, respectively. The efficiencies and properties of the two host materials are typically very similar, yet YSGG categorically operates more efficiently than GGG.; The spectral and spatial characteristics of the emission are also observed. The lasers typically operate on four or five longitudinal modes. Tunable, single-frequency emission is demonstrated from Er:YAG at 2.94-{dollar}mu{dollar}m. TEM{dollar}sb{lcub}00{rcub}{dollar}-mode operation from GGG and YSGG is observed under Ti:sapphire-pumped conditions; multimode operation is observed from the diode-pumped system.
机译：{rm} rm Ersp {lcub} 3+ {rcub} {lcub}的光谱和3- {dollar} mu {dollar} m激光特性：{rcub} Gdsb3Gasb5Osb {lcub} 12 {rcub} {dollar}和{dollar } rm Ersp {lcub} 3+ {rcub} {lcub}：{rcub} Ysb3Scsb2Gasb3Osb {lcub} 12 {rcub} {dollar}进行了调查。 Judd-Ofelt理论用于计算辐射寿命，分支比和辐射量子效率。结果表明，辐射寿命明显长于{dollar} rmsp4Isb {lcub} 11/2 {rcub}，sp4Isb {lcub} 9/2 {rcub} {dollar}和{dollar} rmsp4Ssb {lcub} 3实际观察到的寿命/ 2 {rcub} {dollar}状态，表明强淬火过程在这些介质中进行。对于GGG和YSGG，从{rmsp4Isb {lcub} 11/2 {rcub} {dollar}状态观察到的辐射量子效率分别为24％和32％。在实验中检验了上转换的作用，其中{dollar} rmsp4Ssb {lcub} 3/2 {rcub} {dollar}和{dollar} rmsp4Isb {lcub} 9/1 {rcub} {dollar}斩波后的连续抽运状态在两个时域内进行分析：直接激励产生的和上变频诱导激励产生的。量化上转换诱导的发光与泵浦诱导的发光的比率并将其应用于简化的速率模型，从中可以得出{dolrm} rmsp4Isb {lcub} 13/2 {rcub} {dollar}和{dollar} rmsp4Isb {lcub计算} 11/2 {rcub} {dollar}上转换系数，{dollar} alphasb1 {dollar}和{dollar} alphasb2 {dollar}。计算出的{alpha} b1 {dollar}通常大于计算出的{alphasb2 {dollar}，这部分地解释了连续激光振荡发生的机理。使用整体式激光谐振器研究了Er：GGG和Er：YSGG的3muμm激光特性。钛，蓝宝石或InGaAs二极管激光器将激光直接泵入0.97 {μm}美元附近的rmsp4Isb {lcub} 11/2 {rcub} {美元}上部状态。从二极管泵浦的Er：YSGG和Er：GGG分别观察到大于2.75的2.79-μm激光发射和约0.3-W的2.82-μm激光发射。 。两种基质材料的效率和性能通常非常相似，但是YSGG绝对比GGG有效。还观察到发射的光谱和空间特性。激光器通常以四个或五个纵向模式工作。从Er：YAG在2.94- {μm}μm{dollar} m处演示了可调谐的单频发射。在钛：蓝宝石泵浦条件下，观察到来自GGG和YSGG的TEM {dollar} sb {lcub} 00 {rcub} {dollar}模式操作；从二极管泵浦系统观察到多模工作。

著录项

  • 作者

    Dinerman, Bradley Jay.;

  • 作者单位

    Boston College.;

  • 授予单位 Boston College.;
  • 学科 Physics Optics.; Physics General.; Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;物理学;
  • 关键词

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