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题名	钛宝石晶体的制备、光学和激光性能研究
作者	张小翠
学位类别	硕士
答辩日期	2014
授予单位	中国科学院上海光学精密机械研究所
导师	司继良（高级工程师）
关键词	钛宝石 温梯法 光学性能 激光性能
其他题名	Growth, Optical and Laser Properties of Titanium-doped Sapphire Crystal
中文摘要	钛宝石晶体(Ti3+:Al2O3)是当今最优良的固体宽调谐激光材料，具有优良的激光特性——宽带可调谐(输出0.65～1.2 m)的可调谐激光以及优良的热学、光学、物理、化学和机械性能。掺钛蓝宝石晶体是80年代初期发展起来的新型可调谐激光晶体。由于CPA（The chirped-pulse amplification）技术,钛宝石晶体的宽发射谱可以压缩获得极高峰值功率的超短脉冲。随着激光技术的发展，生长高质量低缺陷的激光晶体成为一个很重的研究课题，本文旨在介绍钛宝石晶体生长方法和性能研究。 本文主要内容包括以下几个方面： （1）研究了温度梯度法生长Ti3+:Al2O3晶体的工艺过程，包括配制原料、混料、烧料、晶体生长、退火等工艺参数，成功生长出了0.2，0.25，0.35，0.45 wt.%四类Ti3+:Al2O3晶体。 （2）文章研究钛宝石的位错形成、位错密度和晶体结构。通过化学腐蚀法，利用光学显微镜观察表征了晶体的位错密度为3.8×103/cm2。使用X-射线粉末衍射实验对钛宝石晶体进行分析，结果表明晶体结晶度非常好，掺杂并没有改变晶体的结构。 （3）应用UV/VIS测定室温下钛宝石晶体在300nm～1000nm波长范围内的吸收谱，测定钛宝石晶体在200-1100nm出处的透过率，计算钛宝石的FOM（a figure of merit）值达240以上。测定钛宝石晶体径向横截面不同位置在527nm处的吸收波动，表征晶体中Ti3+的掺杂浓度波动，研究钛宝石晶体的掺杂均匀性问题。测定钛宝石的发射谱，研究晶体在紫外和可见光波长范围内的发射谱线。测定钛宝石的激光特性，研究其激光增益特性，并将相同口径的国外生长和温梯法生长的钛宝石进行一系列的激光性能测试比较,光斑质量较高、无畸变，且其泵浦激光的放大输出能量达到国际相同规格钛宝石的同等水平。
英文摘要	Titanium-doped sapphire (Ti3+:Al2O3) crystal is the most widely used tunable laser solid material, with excellent laser characteristics –the wide emission bandwidth (spanning 0.65 ~ 1.2m)，excellent thermal, optical, physical, chemical and mechanical properties. Titanium-doped sapphire crystals was developed in the early 1980s, a new type of tunable laser crystal. With the advent of the CPA (The chirped-pulse amplification) technology, laser pulses can be compressed to ultrashort length, and thus extremely high peak power. With the development of laser technology, the growth of high-quality and low-defect Ti3+:Al2O3 crystal became an important research topic, this paper aims to introduce Ti3+:Al2O3 crystal growth methods and properties. The research work is summarized as the following: (1) The growth process of Ti3+: Al2O3 crystal was detailed researched, including raw material preparation, crystal growth and annealing process. Ti3+:Al2O3 with different doping contents(0.2，0.25，0.35，0.45 wt.%) were grown by the temperature gradient technique. (2) The paper studied the dislocation formation, dislocation density and crystal structure of Ti3+:Al2O3. The dislocation density of Ti3+:Al2O3 crystal was characterized to be 3.8×103/cm2 with an optical microscope after etching the polished c-cut sample in KOH solution. XRD results indicated a very good crystallization of the crystal. The doped ions in the crystal lead to a little change in lattice parameters, but the crystal still remain their own structure. (3)The absorption feature of Ti3+:Al2O3 crystal were analyzed through the results of absorption spectra measured by UV / VIS spectrophotometer at room temperature over 300-1000nm. The transmittance of Ti3+:Al2O3 is measured in 200-1100nm, and a figure of merit (FOM) is then evaluated above 240. The radial doping uniformity of large-sized Ti3+: Al2O3 crystal was demonstrated by measuring the absorption fluctuation at 527nm in cross-section of the crystal. The article measured and analyzed data the emission spectrum of Ti3+: Al2O3 crystal in the visible and ultraviolet wavelength range. Ti3+:Al2O3 crystal laser performance was measured to characterization of crystal laser gain properties. The laser quality of Ti3+:Al2O3 crystal in both static and single pulsed amplifier system are outstanding without distortion, and the amplified output energy achieves international level.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16862]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	张小翠. 钛宝石晶体的制备、光学和激光性能研究[D]. 中国科学院上海光学精密机械研究所. 2014.

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