室温下光纤耦合二极管泵浦Tm：YAP激光器

为实现室温下小型化、高效率的1.9μm激光输出,采用793.5 nm激光二极管泵浦Tm：YAP晶体,晶体采用热电制冷及风冷的方式控制在18℃,采用1∶1的聚焦耦系统,获得功率为2.2 W、中心波长为1928 nm的激光输出,光光转换效率为31%,斜率效率达41%。对影响激光输出的耦合输出率、腔型、腔长、晶体工作温度等因素进行了实验分析,实验结果表明：输出功率的变化与温度基本成线性关系,当增加激光谐振腔长时,由于高阶模式损耗加大以及晶体热透镜效应的加重导致腔内损耗加大,输出功率和斜率效率都有所下降。

基于Landsat TM的西安市城市热岛效应研究

IEECAS SKLLQG

端面抽运的Tm:YAP薄片板条激光器的研究

2μm激光器由于其在遥感、雷达和医疗等领域具有重要的应用前景而受到越来越广泛的重视。Tm3+具有长的荧光寿命,且其吸收带与商用的激光二极管相匹配。YAP具有与YAG近似的机械和热性能,其双折射特性使得Tm:YAP激光器可以直接得到线偏振的激光输出,并且可以降低热退偏效应。795nm连续抽运光经透镜组耦合进薄片板条1mm×5mm晶体端面,采用平凹腔结构,分析比较了1%,4%和5%掺杂浓度的Tm:YAP的激光特性。

Passive Q-switching of short-length Tm3+-doped silica fiber lasers by polycrystalline Cr2+:ZnSe microchips

We demonstrate passive Q-switching of short-length double-clad Tm3+-doped silica fiber lasers near 2 mu m pumped by a laser diode array (LDA) at 790 nm. Polycrystalline Cr2+:ZnSe microchips with thickness from 0.3 to 1 mm are adopted as the Q-switching elements. Pulse duration of 120 ns, pulse energy over 14 mu] and repetition rate of 53 kHz are obtained from a 5-cm long fiber laser. As high as 530 kHz repetition rate is achieved from a 50-cm long fiber laser at similar to 10-W pump power. The performance of the Q-switched fiber lasers as a function of fiber length is also analyzed. (c) 2008 Elsevier B.V. All rights reserved.

Tm-doped fibre laser pumped Cr2+: ZnSe poly-crystal laser

Demonstrations of cw lasing in Cr2+:ZnSe poly-crystal are reported. The laser consists of a 1.7-mm-thick Cr2+:ZnSe poly-crystal disc pumped by a Tm-silica double-clad fibre laser at 2050nm. Using a concave high-reflection mirror with a radius of curvature of 500mm as the rear mirror, the laser delivers up to 1030mW of radiation around 2.367 mu m.

970nm抽运下Tm^3／Yb^3＋共掺氧氟玻璃的频率上转换发光

稀土离子掺杂的氧氟玻璃是一种新型上转换发光材料。制备了Tm^3／Yb^3＋单掺、共掺的摩尔分数为n（SiO2）-0．30，n（PbF2）-0．50，n=（Al2O3）=0．15，n（AlF3）=（0．049-x），n（TmF3）=y，n（YbF3）=x（x=0，0．001，0．010，0．015，0．020，y=0，0．001）系统氧氟玻璃，研究了其上转换发光特性、分析了其上转换发光机理。研究发现，在970nm抽运光源激发下，Tm^3＋单掺时没有可见光上转换发射；而加入Yb^3＋后产生了强的蓝光（452n

卤化铅调整Tm^3＋／Yb^3＋共掺碲酸盐玻璃上转换发光研究

研究了卤化铅调整Tm^3+／Yb^3+共掺碲酸盐玻璃的热稳定性能、Raman光谱和上转换发光光谱，分析了Tm^3+／Yb^3+共掺氧卤碲酸盐玻璃的上转换发光机理．结果发现：混合卤化铅调整Tm^3+／Yb^3+共掺碲酸盐玻璃具有好的热稳定性能、低的声子能量、强的上转换蓝光．这表明混合卤化铅调整Tm^3+／Yb^3+共掺碲酸盐玻璃是一种上转换蓝光激光器的潜在基质材料．