Theoretical analysis on threshold of solar pumped solid state lasers
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摘要: 为了选择适合太阳光泵浦的金宝搏188软件怎么用 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金宝搏188软件怎么用 材料对泵浦光吸收能力,建立了太阳光泵浦固体金宝搏188软件怎么用 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Nd3+:YAG、Nd3+:glass、Nd3+:Cr3+:GSGG (Nd3+:Cr3+:Gd3Sc2Ga3O12)、Cr3+:BeAl2O4和Cr3+:Nd3+:YAG等金宝搏188软件怎么用 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,Nd3+: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金宝搏188软件怎么用 材料。由于椭球腔的特殊结构,采用椭球腔侧面泵浦金宝搏188软件怎么用 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金宝搏188软件怎么用 材料中筛选出在太阳光泵浦下最易输出金宝搏188软件怎么用 的工作物质。
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关键词:
- 固体金宝搏188软件怎么用 器 /
- 太阳光泵浦 /
- 速率方程 /
- 理论分析 /
- 泵浦阈值光强
Abstract: In order to select suitable solar pumped laser materials, a theoretical model is established based on the four-level rate equation, taking the solar spectrum into account. By this model, the pump intensity thresholds of Nd3+:YAG, Nd3+:glass, Nd:Cr:GSGG (Nd3+:Cr3+:Gd3Sc2Ga3O12), Cr3+:BeAl2O4 and Cr3+:Nd3+:YAG for the different pump schemes are analyzed. The results show that the pump intensity threshold of Nd3+:YAG is 448 sun constant when it is side pumped by a single beam and is 224 sun constant when it is side pumped inside a ellipsoidal cavity, respectively, indicating that Nd3+:YAG is suitable for solar pumped laser material. Due to the special structure of the ellipsoidal cavity, the pump intensity threshold is relatively low when it is side pumped inside a ellipsoidal cavity. The relationship between the pump intensity threshold and the diameter of the material is also analyzed. The model could be applied to select suitable materials which are easier to achieve laser output from the existing laser materials.-
Key words:
- solid state lasers /
- solar pumped /
- rate equation /
- theoretical analysis /
- pump intensity threshold
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表 1 几种常用金宝搏188软件怎么用 材料的光谱参数
Table 1. Spectral parameters of some laser materials
Active medium Nd3+∶YAG Cr3+∶BeAl2O4 Nd3+∶glass Nd3+∶Cr3+∶GSGG(Nd3+∶Cr3+∶Gd3Sc2Ga3O12) Cr3+∶Nd3+∶YAG DopingDensity/cm3 1.38×10201 at.%[ 10] 2.9×10190.1 at.%[ 12] 2.85×10203 at.%[ 18] Nd3+=2×1020Cr3+=1×1020 [10] Cr3+=1.39×10190.1 at.%Nd3+=1.39×10201 at.%[ 19] Absorptionband/nm 515~545565~595735~765795~825855~885[ 20] 360~460500~600[ 21] 515~545565~595735~765795~825855~885[ 18] 400~545565~700735~765795~825855~885[ 10] Nd3+:510~540560~630730~760790~825Cr3+:450~490510~540865~890[ 19] Absorption cross section/cm2 0.56×10-20(530~550)0.84×10-20(570~600)1.41×10-20(750~775)1.69×10-20(800~820)[ 14] 1.04×10-19(360~460)1.9×10-19(500~600)[ 21] 1.33×10-20 0.393 75×10-20(400~545)0.355×10-20(565~700)0.125×10-20(735~765)0.11×10-20(795~825)0.078×10-20(855~885)[ 22] 2.518×10-19 Fluorescence Lifetime/μs 230[ 12] 260[ 12] 350[ 23] Nd3+:280Cr3+:120 [ 24] 600[ 13] Emission cross section/cm2 6.5×10-19@1 064[ 13] 0.7×10-20@760[ 25] 3×10-20@1 064[ 26] 3.2×10-19@1 060[ 27] 2.35×10-19@1 064[ 28] -
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