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