太阳光泵浦固体激光阈值的理论分析

发布时间：2018-10-17 08:30

【摘要】：为了选择适合太阳光泵浦的激光材料,本文从四能级速率方程出发,综合考虑了太阳辐射带状光谱特性和激光材料对泵浦光吸收能力,建立了太阳光泵浦固体激光理论模型。利用该模型推导得到了单束光侧面泵浦和椭球腔侧面泵浦方式下的泵浦阈值表达式,并结合Nd~3+∶YAG、Nd~3+∶glass、Nd~3+∶Cr~3+∶GSGG(Nd~3+∶Cr~3+∶Gd_3Sc_2Ga_3O_12)、Cr~3+∶BeAl_2O_4和Cr~3+∶Nd~3+∶YAG等激光材料的光谱参数,计算了这些材料的泵浦阈值光强。结果表明:在单束光侧面泵浦和椭球腔侧面泵浦方式下,Nd~3+∶YAG的泵浦阈值光强分别为448个太阳常数和224个太阳常数,是比较适合用太阳光泵浦的激光材料。由于椭球腔的特殊结构,采用椭球腔侧面泵浦激光介质,阈值光强比较低。分析了泵浦阈值光强与材料直径的关系。该模型可用于从现有的激光材料中筛选出在太阳光泵浦下最易输出激光的工作物质。
[Abstract]:In order to select the laser materials suitable for solar pumping, a theoretical model of solar-pumped solid-state laser is established based on the four-level rate equation, the spectral characteristics of solar radiation band and the absorption ability of laser materials to pump light. By using this model, the pump threshold expressions of single beam side pumping and ellipsoidal cavity side-pumping are derived, and the spectral parameters of Nd~3: YAG,Nd~3: glass,Nd~3: Cr~3: GSGG (Nd~3: Cr~3: Gd_3Sc_2Ga_3O_12), Cr~3: BeAl_2O_4 and Cr~3: Nd~3: YAG are combined. The pump threshold intensity of these materials is calculated. The results show that the pump threshold intensity of Nd~3: YAG is 448 solar constants and 224 solar constants respectively under the single-beam side-pumped mode and ellipsoidal side-pumped mode. Because of the special structure of the ellipsoid cavity, the laser medium is side-pumped by the ellipsoidal cavity, and the threshold light intensity is relatively low. The relationship between pump threshold intensity and material diameter is analyzed. The model can be used to screen the most easily output laser materials from existing laser materials.
【作者单位】：福建师范大学光电与信息工程学院激光与光电子技术研究所;福建省光子技术重点实验室;医学光电科学与技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(No.61008062)~~
【分类号】：TN24

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