共查询到18条相似文献,搜索用时 140 毫秒
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Tm:YAG晶体的光谱及激光特性研究 总被引:5,自引:1,他引:4
测试了Tm:YAG晶体的室温吸收光谱和荧光光谱,计算了各吸收谱线的振子强度,并根据Judd-Ofelt理论了Tm:YAG晶体的荧光跃迁截面和荧光寿命,用红宝石激光泵浦时,获得了波长2.01μm能量40mJ的激光脉冲。 相似文献
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通过对Cr∶YAG、Tm∶YAG和Cr,Tm∶YAG晶体吸收光谱和发射光谱的比较,研究了Cr,Tm∶YAG晶体中的能量转移过程.指出Cr3+→Tm3+能量转移过程中,无辐射能量转移占绝对优势. 相似文献
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测量了Cr^4+,YAG、Cr^4+,Mg2SiO4晶体在室温和液氮温度下的荧光光谱,吸收光谱和激发态寿命,讨论了温度变化时,两种晶体中Cr^4+近红外辐射积分强度变化与激光发态寿命变化的关系,得出结论:在77K ̄300K范围内,Cr^4+的^3T2能级荧光辐射截面本身受温度影响不大,Cr^4+辐射荧光的变化,主要是由无辐射弛豫速率随温度变化而引起的。 相似文献
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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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YAG晶体中Cr~(3+)→Tm~(3+),Er~(3+)→Tm~(3+)的能量 总被引:1,自引:1,他引:0
研究了加入敏化离子Cr3+和Er3+的Tm:YAG晶体的吸收谱和荧光谱,计算了Cr3+、Er3+、Tm3+离子的2E、4I13/2、3F4能态的平均寿命及能量;转移效率、转移速率.得出Cr3+→Tm3+转移效率为80%,转移速率为2.1×103s-1.由(Er,Tm):YAG的荧光谱可见存在Er3+→Tm3+的有效的能量转移.讨论了Cr3+→Tm3+和Er3+→Tm3+能量转移的不同. 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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纵向泵浦Tm:YAG激光器的理论研究 总被引:3,自引:0,他引:3
用准三能级系统速率方程对纵向泵浦Tm:YAG激光器的阈值,效率和激活介质最佳长度进行了计算和分析,讨论了温度对Tm:YAG激光器输出特性的影响。 相似文献
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Yb:YAG晶体的制备与光谱特性 总被引:5,自引:0,他引:5
用引上法生长Yb:YAG晶体,确定了合适的退火工艺,研究了Yb:YAG晶体中Yb^3+的光谱性能双及晶体缺陷对Yb^2+光谱性能的影响。 相似文献
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Cr,Tm:YAG晶体中的能量转移 总被引:1,自引:0,他引:1
通过对Cr:YAG、Tm:YAG和Cr,Tm:YAG晶体吸收光谱和发射光谱的比较,研究了Cr,Tm:YAG晶体中的能量转移过程.指出Cr3+→Tm3+能量转移过程中,无辐射能量转移占绝对优势. 相似文献
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The absorption spectra, fluorescence spectra, and lifetimes of as-grown and annealed Cr,Yb:YAG crystal grown by Czochralski technique have been measured. The broad absorption bands in the visible region increase in intensity and shift to long wavelength after annealing, and the additional absorption around 482 nm may be possibly due to new octahedral Cr4+ center in the crystal, and the increase in the infrared (IR) region is due to the increase of Cra+. The increase of Cr4+ also results in the groud state absorption and the concentration quenching of Ybs+ in Cr,Yb:YAG crystal after annealing, the fluorescence intensity is reduced to 75% and the emission lifetime is shortened from 1.40 to 0.44 ms. 相似文献
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Widely tunable performances of Tm:YAG and Tm:LuAG lasers near 2 μm are demonstrated. The emission spectra of Tm3+ in these two single crystals are reported and analyzed. The lifetimes of the 3 F 4 state in thulium-doped YAG and LuAG are 10.1 and 9.2 ms, respectively. In addition, it is proven that the Tm:YAG crystal with two bonded undoped YAG ends is promising for high-efficient operation. 相似文献
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Tm:YVO4晶体的光谱参数计算 总被引:10,自引:0,他引:10
由测量的Tm :YVO4晶体的吸收光谱 ,考虑到单轴晶体在各个方向上的吸收不同和折射率随波长的变化 ,根据Judd Ofelt理论计算了Tm3 +在YVO4中的强度参数、各个能级的振子强度、自发辐射几率、荧光分支比、积分发射截面等参数。强度参数为Ω2 =1 9416× 10 - 2 0 (cm2 ) ,Ω4=0 15 6 8× 10 - 2 0 (cm2 ) ,Ω6=0 396 3× 10 - 2 0 (cm2 )。计算结果表明 ,1 D2 → 3 F4的跃迁几率远大于1 D2 向其他各个能级的跃迁几率 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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Laser crystal Yb3+-doped NaY(WO4)2 (Yb:NYW) with excellent quality has been grown by Czochralski technique. The rocking curves from (400) plane of as-grown
Yb:NYW crystal was measured and the full-width value at half-maximum was 19.92″. The effective segregation coefficients were
measured by the X-ray fluorescence method. The polarized absorption spectra and the fluorescence spectra of Yb:NYW crystal
were measured at room temperature. The fluorescence decay lifetime of Yb3+ ion in NYW crystal has been investigated. The spectroscopic parameters of Yb:NYW crystal are calculated and compared with
those of Yb:YAG crystal. A continuous wave output power of 3.06 W at 1031 nm was obtained with a slope efficiency of 42% by
use of diode pumping. 相似文献
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Y. Cheng X. B. Yang Z. Xin S. S. Cheng D. H. Cao X. D. Xu J. Xu 《Laser Physics》2009,19(12):2168-2173
Yb3+-doped NaGd(WO4)2 (Yb:NGW) crystal has been successfully grown by Czochralski method. The rocking curves from (400) plane of as-grown Yb:NGW
crystal was measured and the full-width values at half-maximum was 21″. The polarized absorption spectra, the fluorescence
spectra and the fluorescence decay lifetime of Yb:NGW crystal were measured at room temperature. The spectroscopic parameters
of Yb:NGW crystal are calculated and compared, with those of Yb:YAG crystal. A continuous wave output power of 3.01 W at 1048
nm was obtained with a slope efficiency of 71% by use of diode pumping. 相似文献