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摘要2 μm激光处于大气窗口，具有眼安全特性，在激光医学、激光雷达、遥感探测、大气环境监测以及军事方面具有广泛应用，而且还是实现中红外3~5 μm波段光学参量振荡器的泵浦源。本文对以1617 nm激光作为泵浦源,利用体布拉格光栅作为腔镜,研究了Tm:YAG陶瓷激光器窄线宽激输出特性。在泵浦光功率最大4.6 W时激光输出1.64 W，其运行波长为 1999.9 nm，光谱带宽0.26 nm，表明反射式体布拉格光栅表现出良好的光谱选择及光谱窄化性能。68843
毕业论文关键词： Tm：YAG陶瓷激光器 体布拉格光栅 窄线宽
Wavelength Tuning Characteristics Of Tm:YAG Ceramic Laser Based On VBG
Abstract
Eye-safe wavelength region solid state lasers operating around 2 μm have attracted wide attention because of their extensive applications in a number of important areas: medical treatment, laser radar, remote sensing, environmental gas detection, special military and provides an ideal pump sources for 3-5 μm mid-infrared laser generation via non-linear frequency conversion. The output characteristics of 1617 nm resonantly-pumped Tm:YAG ceramic lasers based on a reflective volume Bragg grating was studied in this paper. The VBG-based Tm:YAG laser yielded 1.64 W of output power at 1999.9 nm (linewidth of 0.26 nm) for 4.6 W pump power, indicating the reflective volume Bragg grating has excellent ability for wavelength-selection and spectral narrowing.
Key Words:Tm:YAG ceramic laser Volume Prague grating narrow linewidth
目录
摘 要 I
Abstract II
目录 III
图清单 IV
变量注释表 IV
一、引言 1
二、2µm波段陶瓷激光器 1
2.1透明激光陶瓷 2
2.2 Tm：YAG 2
三、 体布拉格光栅的基本理论和应用 4
3.1体布拉格光栅的特点 4
3.2体布拉格光栅在激光腔中的作用 7
四、基于VBG选频的窄线宽Tm:YAG 陶瓷激光器 9
4.1 光泵浦系统 9
4.2 谐振腔 10
4.3 冷却系统 10
4.4连续运转、窄线宽Tm:YAG陶瓷激光器实验结果 11
五、总结 13
参考文献 14
图清单
图序号 图名称 页码
图2-1 Tm：YAG的荧光图谱 3
图2-2 Tm：YAG的吸收光谱 3
图2-3 Tm：YAG的激光参数 4
图3-1 光热折射玻璃的吸收光谱 5
图3-2 反射体布拉格光栅的实际光路（a） 6
图3-3