【作者】 易里成荣；

【导师】 刘景和；

【作者基本信息】 长春理工大学 ， 材料物理与化学， 2003， 硕士

【摘要】 本文对激光晶体进行了探讨，介绍了激光晶体和掺稀土的无机激光晶体、钨酸盐体系激光晶体。研究了Nd：NBW（分子式：Nd：NaBi（WO₄）₂）以及二元钨酸盐的国内外发展现状和应用前景。本文还对激光及其机理、用途、种类、发展方向等进行了比较详细的讨论。Nd：NBW晶体生长实验采用Czochralski（简称：Cz法）工艺，研究了Nd：NBW晶体的最佳生长工艺，得出了其最佳生长条件为：固-液界面中心的轴向温度梯度7—10℃／cm，径向温度梯度越小越好、生长速率0.2—0.5mm／h、晶体转速1—4rpm、冷却速率15℃／h。分析了晶体产生开裂的原因，采用严格控制生长参数的方法予以解决。在国内首次生长出尺寸为Φ8×20mm的Nd：NBW晶体。并对其进行了加工，制成了器件，利用XRD、吸收-透过光谱、发光光谱、振动光谱等方法对其进行了测试，分析了测试结果，确定了Nd：NBW晶体的晶格结构，研究了其吸收边红移现象的原因，验证了Nd：NBW晶体元件可用于LD（激光二极管）泵浦的激光发射，分析了⁴F_3/2→⁴I_11/2、⁴F_3/2→⁴I_13/2两个发光峰值的特点，并对Nd：NBW晶体中的红外与Raman进行了归属。以上对Nd：NBW晶体进行的性质研究，在国内尚属首次。更多还原

【Abstract】 The laser crystal is studied in this paper, especially for rare earth doped double tungstates crystal. The present development and applied future of Nd:NaBi(WO4)2 (for short: Nd:NBW) crystal is introduced. The laser mechanism , usage, variety and development of laser crystal is researched in the discourse. The best condition of Nd:NBW crystal for growth by Czochralski method is resulted in the following: 7-10 /cm for axial temperature gradient along the centre of solid-fluid interface, 0.2-0.5mm/h for growth rate, 1-4rpm for crystal rotation rate, 15 /h for crystal cooling rate. The reasons of cleavage in the crystal is analyzed and solved by strict control of growth parameters. The size of grown Nd:NBW crystal is 8 20mm . Its units have been investigated by kinds of spectra and the construction of its lattice has been determined. The phenomenon of larger end wavelength in ultraviolet zone of this crystal has been explained. It can be inferred that Nd:NBW crystal fits to the aim of emission pumped by LD(Laser Diode). The properties of two channels of luminous pattern (4F3/2-I11/2,4F3/2 -4I13/2) have been studied. And the vibration patterns of this crystal have been analysed. All of the above have been evidenced as the first time research in China.更多还原