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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
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The absorption spectra characters of the (Cr,Yb):YAG,Cr:YAG and Yb:YAG crystals are reported. In the absorption spectra of the (Cr,Yb): YAG crystal,there are two absorption bands at 937 nm and 968 nm respectively,which are suitable for InGaAs diode laser pumping;and there is an absorption band of Cr4+ near 1030 nm,which is suitable for passive Q switch laser output at 1.03 μm. This Cr-Yb-codoped crystal may be a potential material for compact,diode laser pumped passive Q-switched solid-state laser with efficient,high-stable. 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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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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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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利用Siegman速率方程组,采用自适应变步长龙格一库塔数值方法,对Cr4+:Nd3+:YAG自调Q陶瓷激光器的输出特性进行了数值模拟,详细讨论了Nd3+:YAG陶瓷厚度以及Cr^4+离子浓度对陶瓷激光器的重复频率、峰值功率、单脉冲能量、脉冲宽度、以及平均输出功率等输出特性的影响。研究结果表明,随着参与作用的Nd^3+离子数的增加,输出激光脉冲重复频率和平均输出功率均会明显提高;随着Cr^4+离子浓度的升高,输出激光脉冲重复频率和平均输出功率则会明显下降。 相似文献
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The self-Q-switched laser performance of monolithic Cr4+,Nd3+:YAG concave-planar resonator with 5-mm length was studied experimentally and theoretically. The slope efficiency is as high as 24% and pump threshold is as low as 64 mW. The pulse width, the single pulse energy and the pulse repetition rate of monolithic Cr,Nd:YAG self-Q-switched laser were measured as a function of absorbed pump power. With the increase of pump power, the pulse width decreases and the pulse energy and the pulse repetition rate increase. The average output power of 91 mW with pulse width of 7 ns at repletion rate of 35.5 kHz was obtained at the maximum absorbed pump power of 440 mW, the peak power is as high as 370 W. The theoretical prediction of pulse energy, pulse width and pulse repetition rate as a function of absorbed pump power based on rate equations is in a good agreement with our experimental data. This can lead to develop the diode laser-pumped monolithic self-Q-switched solid-state microchip lasers. 相似文献
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LD端面泵浦腔内倍频Yb:YAG绿光激光器 总被引:1,自引:0,他引:1
报道了一种激光二极管(LD)端面泵浦10at%掺杂Yb:YAG激光晶体(4×4×1mm)和Ⅰ类临界相位匹配LBO的腔内倍频全固态绿光激光器.为了克服"绿光问题",采用了两个激光二极管偏振耦合系统.在双路泵浦功率为1.2W时,获得最高功率为40mW525nm的连续基模激光输出.在腔内插入Cr4+:YAG饱和吸收体被动调Q,在泵浦功率为1.2W时,可以获得平均功率为5.2mW,脉冲重复频率为2.44kHz,脉冲宽度为51.5ns,峰值功率为41.7W的515nm脉冲激光输出.输出波长发生变化,而且515nm脉冲激光输出的阈值仅为728mW. 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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We first experimentally demonstrate a laser-diode end-pumped self-Q-switched and mode-locked Nd,Cr:YAG green laser with a KTP crystal as the intra-cavity frequency doubler. The device produces
an average output power of 680 mW at 532 nm. The corresponding pulse width of the Q-switched envelope of the green laser is 170±20 ns. The mode-locked pulses have a repetition rate of approximately 183
MHz and the average pulse duration is estimated to be around sub-nanosecond. It is found that the intra-cavity frequency doubling greatly improves the modulation depth and stability of the
mode-locked pulses within the Q-switched envelope. 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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激光二极管端面泵浦Yb∶YAG薄片激光器的热效应 总被引:3,自引:1,他引:3
通过激光二极管端面泵浦Yb∶YAG薄片工作特点分析,建立了符合实际情况的热模型.热模型考虑了介质薄片具有端面绝热、周边恒温冷却、后端面镀膜达到充分利用泵浦光能量等特点.分析并建构了Poisson方程新的求解方法,得出了Yb∶YAG薄片内部温度场以及泵浦端面热形变场的一般解析表达式.理论研究结果表明:若激光二极管泵浦功率为20 W、耦合到薄片泵浦面的泵浦光高斯半径为250 μm时,长度3 mm、半径1.5 mm的5.0at.%Yd:YAG薄片泵浦端面的最高温升为44.5℃,最大热形变量为0.83 μm. 相似文献
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The high efficient laser performance of self-Q-switched laser in the co-doped Cr4+,Nd3+:YAG microchip with 1.8 mm thickness was demonstrated. The slope efficiency is varied with the reflectivity of output coupler at 1064 nm, and the highest slope efficiency of 26% was obtained for 95% reflectivity of output coupler at 1064 nm. The pulse width, the single pulse energy and the pulse repetition rate for different reflectivity of the output couplers were measured, and the experimental results agree with the numerical calculations of the passively Q-switched rate equations. This can lead to develop the diode laser pumped monolithic self-Q-switched solid-state microchip lasers, especially for the intracavity frequency-doubled solid-state microchip lasers. 相似文献
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高温熔制Er3+,Yb3+离子掺杂CaO-Y2O3-Al2O3-SiO2系统玻璃,并进行微晶化处理,研究了微晶玻璃中Er3+离子的发光及上转换发光特性,分析了微晶玻璃上转换发光机理.结果表明:原始玻璃经热处理得到了Er,Yb:YAG微晶玻璃,微晶玻璃中Er3+离子在室温下4I13/2→4I15/2跃迁产生横盖1450—1650nm区间的超宽带荧光,荧光半高宽达180nm,这可能由于YAG微晶相中Er3+离子与玻璃相中残留Er3+离子的共同发光;Er3+与Yb3+离子局域基质声子能量的降低使微晶玻璃Er3+离子上转换发光强度与原始玻璃相比显著提高,绿光、红光上转换荧光强度比玻璃样品分别增强约7和3倍;微晶化后Er3+,Yb3+离子局域环境发生变化也导致微晶玻璃中Er3+离子绿光、红光上转换发光相对强度发生变化.
关键词:
铒
镱:钇铝石榴石
微晶玻璃
荧光光谱 相似文献
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Based on space-dependent rate equations, the lowest threshold input power for a diode end-pumped solid-state laser is obtained for the pump spot size wp→0. However, as the pump beam waist is decreased, the thermally induced effects in the laser rod would be very high. Diffraction losses caused by radial and tangential variations of refractive index have been analyzed and compared for the Nd : YAG and the Yb : YAG at room temperature (300 K) and liquid-nitrogen temperature (77 K). 相似文献