共查询到17条相似文献,搜索用时 93 毫秒
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Yb:YAG晶体的光谱性能 总被引:10,自引:0,他引:10
系统地研究了不同掺杂浓度的Yb:YAG晶体的光谱特性,通过吸收光谱的测量计算了晶体的吸收截面,用对易法计算了晶体的发射截面。在Yb:YAG晶体毛坯中发现Yb^2+和色心,其浓度随Yb:YAG晶体中Yb^3+的增加而增加。经1400℃氧气氛退火后消失。首次用光子激发和X射线激发研究了Yb:YAG晶体的荧光特性。 相似文献
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Yb:YAG晶体的光谱和激光性能 总被引:8,自引:1,他引:7
研究了Yb:YAG晶体的光谱特性,通过不同掺杂深度的Yb:YAG晶体的荧光寿命的测定,确定了Yb^3+在Yb:YAG晶体的最佳掺杂浓度,用合作上转换机制解释了高浓度掺杂时的荧光浓度猝灭效应,研究了掺杂原子分数为0.2的晶体微片的激光性能。 相似文献
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Yb:YAG晶体中的荧光浓度猝灭现象 总被引:4,自引:0,他引:4
在Yb:YAG晶体中发现浓度猝灭现象,对猝灭机制进行了分析研究,指出退火前晶体的荧光浓度猝灭现象主要由Yb^2+、色心和由此产生的晶格畸变所致高掺杂浓度时痕量稀土杂质离子的存在也将导致浓度猝灭,确定了Yb:YAG晶体中Yb^3+的理想掺杂浓度。 相似文献
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Yb:YAG晶体中的色心 总被引:5,自引:0,他引:5
在用引上法生长的Yb:YAG晶体中,存在一个独特的色心,其吸收带位于375nm的625nm,随着Yb2O3掺杂浓度的增加,色心浓度增加,探讨了晶体生长过程中色心形成机理。高强γ射线辐照Yb:YAG晶体,诱导大量色心的形成。晶体中的 对激发态Yb^3+离子的荧光寿命具有流淬火效应,因此,Yb:YAG激光晶体需要经高温退火,消除色心的影响。 相似文献
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Cr^4+:YAG的可饱和吸收特性与被动Q开关性能研究 总被引:22,自引:6,他引:16
运用速率方程计算了Cr^4+:YAG晶体的可饱和吸收特性参数,包括初始吸收系数,饱和吸收系数,饱和光强和损耗调制度,用Cr^4+:YAG对脉冲和连续Nd:YAG激光器进行了被动调Q,在脉冲Nd:YAG激光器上得到了8ns的调Q激光脉冲,在连续Nd:YAG激光器的调Q中得到了间隔和幅度抖动小于5%的输出脉冲充列。 相似文献
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Cr^4+:YAG被动调Q五激光发态吸收饱和 总被引:1,自引:1,他引:0
运用速率方程计算了R^4+:YAG晶体的基态吸收,激发态吸收与入射脉冲的能量密度和强度的关系。在测量晶体透过率的实验中,发现Cr^4+;YAG晶体的激发态吸收趋于饱和。理论计算与实验数据拟合给出了包括基态吸收截面,激发态吸收截面和寿命等参数。 相似文献
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Cr^4+:YAG调Q特性的理论和实验研究 总被引:22,自引:1,他引:21
从理论和实验两个方面研究Cr^4+:YAG的调Q特性,测量了Cr^4+:YAG调QNd^3+:YAG激光器在不同条件下脉冲能量和脉冲宽度,并与理论结果进行比较,结果显示脉冲能量的理论结果与实验结果能较发地符合,脉冲工的理论结果与实验结果变化趋势大致相一致,文中还对Cr^4+:YAG调QNd^3+:YAG激光器的其它实验现象给出定性解释。 相似文献
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The Yb:YAG and Yb:YAP crystals have been grown by Czochralski method. The absorption spectra and the fluorescence spectra of Yb:YAG and Yb:YAP crystals have been investigated. It is shown that the Yb:YAG crystal has better laser properties and smaller threshold power than Yb:YAP crystal. In addition, the absorption cross-section of the Yb:YAP crystal is 2.16 times of that of the Yb:YAG crystal,so laser diode pumped Yb:YAG lasing can be easily realized. Because YAP single crystal is anisotropic, it is provided with polarization characteristics. 相似文献
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Yb :YAG晶体的闪烁特性 总被引:1,自引:0,他引:1
通过不同Yb3+掺杂浓度(5%~30%,原子数分数)的Yb:YAG晶体的阴极射线发光谱、衰减时间、光输出及其温度依赖关系的测量,研究了Yb:YAG晶体的闪烁性能.不同Yb3+掺杂浓度的Yb:YAG晶体具有不同的光输出和猝灭温度,光输出随Yb3+掺杂浓度的增大而降低,猝灭温度则随掺杂浓度的增大而升高.室温下Yb:YAG晶体的发光衰减时间较短,均小于50ns.Yb3+掺杂浓度为5%的Yb:YAG晶体具有较高的光输出和较低的猝灭温度. 相似文献
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The polarization states of 〈111〉-cut Yb:YAG crystal microchip lasers were investigated by pumped with the elliptically polarized
pump beam from fiber-coupled laser-diode. The manipulated polarized lasers were achieved in laser-diode pumped Yb:YAG microchip
laser by controlling the crystalline-orientations in 〈111〉-growth Yb:YAG crystal. Generally elliptically polarized lasers
were obtained in laser-diode pumped Yb:YAG microchip lasers. However, crystalline-orientation manipulated linearly polarized
laser was obtained when six different sites with different crystalline orientations were set to parallel to the major axis
direction of the elliptically polarized pump beam. Six different sites in Yb:YAG crystal were separated with 30° and 90°,
which were responsible for the linearly polarized laser oscillations. Circularly polarized lasers were observed when a Yb:YAG
crystal was aligned to a special position between two sites responsible for linearly polarized laser oscillation. Effects
of the polarization states of pump source on the laser polarization states of Yb:YAG microchip lasers and polarization direction
of different polarized lasers with respect to Yb:YAG crystal rotation was addressed. 相似文献
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The emission and the lifetime data of Cr, Yb: YAG and Yb: YAG were reported. The effective peak stimulated-emission cross section of chromium and ytterbium-co-doped yttrium-aluminum garnets (Cr, Yb: YAG) has been determined to be 8.98 × 10-20 cm2 at room temperature. The luminescence spectrum of Cr, Yb: YAG is the same as that of Yb: YAG. The luminescence lifetime of Cr, Yb: YAG at room temperature is 0.3 ms (Yb: YAG, 1.48 ms ). The causes of the differences in the fluorescence spectra and the stimulated emission cross-section between Yb: YAG and Cr, Yb: YAG crystals were discussed. Also the potential of Cr, Yb: YAG as a self Q- switched laser crystal was discussed. 相似文献
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Investigation of the Emission Cross-sections and the Spectra of (Cr~(4 ), Yb~(3 ) ): YAG Crystal 总被引:2,自引:0,他引:2
l introductionIn recent years, Cr4 --doped crystals have attracted a great deal of attention aspassive Q--,wit,h.,[l~4]. These Cr4 --dOPed crystals include Cr4 : YAG[l'21 ) Cr4 :GSGG[s], Cr4 : YSO['] etc. They have a large absorption cross section and lOwsaturable intensity at the laser wavelength. In comparison with previously usedsaturable absorbers such as dyes['] and LiF: FZ-- [6] cOlor center crystals, Cr4 -dopedcrystals are more photO--chemically and thermally stable and h… 相似文献
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用脉冲电子束激发测量了不同Yb3+掺杂浓度的Yb∶YAG晶体的红外(IR)闪烁发光性能。Yb∶YAG晶体的IR闪烁发光具有高的光产额和长的衰减时间,但存在浓度猝灭效应和温度依赖关系。Yb∶YAG晶体的IR闪烁性能还与晶体品质有关,相同掺杂浓度的Yb∶YAG晶体,品质优异的会获得更高的光产额。这一初步的研究成果表明,部分掺Yb3+晶体有可能用于医学成像装置。 相似文献
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The absorption and fluorescence spectra of Cr,Yb:YAG crystal were measured. There are two absorption bands at 940 nm and 968 nm although the absorption coefficient is lower than that of the absorption peak of Yb:YAG superimposed in Cr:YAG absorption peak. The emission peak intensity is 4 times lower than that of Yb:YAG, which may be caused by the existence of the ground state absorption of Cr4+ which quenches the Yb3+ emission intensity. Although the emission peak of Cr,Yb:YAG is lower than that of Yb:YAG, there is an advantage of this crystal which combines the saturable absorber and gain medium into one and can be a self-Q switching laser crystal if Cr,Yb:YAG crystal is pumped with high energy power. 相似文献