共查询到11条相似文献,搜索用时 0 毫秒
1.
Solid-state dye samples based on polymethyl methacrylate (PMMA) co-doped with pyrromethene 567 (PM567) and coumarin 500 (C500)
were prepared. The effects of C500 concentration on the performances of the solid state dye mediums, including spectra property,
slope efficiency and photostability were studied. The highest slope efficiency 64.25% was obtained in the sample (PM567: C500
= 2: 8). Pumping the samples at a rate of 5Hz with a pulse energy as high as 100 mJ (the fluence was 0.26 J/cm2), the output energy dropped to half of its initial value after approximate 116130 pulses and the normalized photostability
reached 75.48 GJ/mol in the sample (PM567: C500 = 2: 1). Our results have shown that it is possible to obtain a high-efficiency
with a long-lifetime for a solid-state dye laser co-doped with PM567 and C500. 相似文献
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Solid-state dye samples based on modified copolymers of methyl methacrylate (MMA) and 2-hydroxyethyl methacrylate (HEMA) with methanol doped with PM567 were first prepared. The volume proportions of methanol have great effects on the laser's characteristics including spectra, lasing output and thermal properties. The highest slope efficiency of 64.25% was achieved in the sample MP (MMA:HEMA = 85:15 + 10% methanol). Pumping the samples at a repetition rate of 5 Hz with a pulse energy as high as 100 mJ (the fluence was 0.26 J/cm2), the maximum lifetime of 278,000 shots was obtained in the sample MP (MMA:HEMA = 85:15 + 15% methanol), and the corresponding normalized photostability reached 180.7 GJ/mol. The obtained ten-shots damage thresholds were as high as 6.7 J/cm2. The results indicate that the laser properties of solid-state dyes can be greatly enhanced by using modified copolymers of MMA and HEMA with methanol as solid hosts. 相似文献
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S. S. Anufrik V. V. Tarkovskii V. M. Nikitchenko 《Journal of Applied Spectroscopy》1999,66(5):772-779
The effect of heterocycles of different types on the fluorescence and generation properties of ten new bifluorophores is investigated
experimentally. It is shown that a number of 7-diethylaminocoumarins with a triazole cycle or an oxydiazole cycle are characterized
by the highest generation efficiency in the region of 500–515 nm. The maximum generation energy was 2.5 J in lamp pumping,
which exceeds widely known coumarin 334 in efficiency by a factor of 1.7. Stabilization of the coumarin fragment by the nucleus
of julolidine—7-N(CH2)6—has a favorable effect on the photostability of these molecules. The effect and the role of the isomer form of the thiazole
fragment on the spectral and generation properties of the molecule are established. A favorable effect on the generation efficiency
of the imino group in the coumarin fragment of the molecule is shown.
Reported at the Second International Scientific and Technical Conference on Quantum Electronics, Minsk, November 23–25, 1998.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 5, pp. 675–681, September–October, 1999. 相似文献
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研究了三种掺Yb钒酸盐混晶Yb0.005:Y0.298Gd0.697VO4, Yb0.007:Y0.407Gd0.586VO4和Yb0.009:Y0.575Gd0.416VO4的室温偏振吸收谱和发射谱. 结果表明,最强的吸收和发射相应于π偏振,位
关键词:
掺Yb钒酸盐混晶
吸收谱和发射谱
激光振荡
偏振态 相似文献
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在各类光学系统设计过程中,由于实验系统对于光学器件的透反射率要求不同,需要确定光学器件的透反射率。本文设计了一种对光学器件的透反射率进行精准测量及标定的系统,该系统通过对激光光源进行声光调制,使得激光输出功率的稳定度显著提高,避免了测量时光源不稳定带来的较大误差。实验结果表明,该系统能够稳定光源输出功率,稳定度维持在0.05%/h,甚至更高的水平,满足了光学器件透反射率测量的误差小,精度高等要求。 相似文献
10.
研制了一套基于多光子脉冲内干涉相位扫描方法的可以同时对飞秒激光脉冲进行相位测量和补偿的实验系统装置.实验中,通过自主研发的LabVIEW程序控制液晶空间光调制器和光纤光谱仪,对待测飞秒激光脉冲施加相位扫描,并同时记录受到调制的飞秒激光脉冲的倍频光谱,得到了多光子脉冲内干涉相位扫描(MIIPS)轨迹图.通过MIIPS轨迹图的三次测量和迭代运算,还原出了经过预先啁啾调制的中心波长约为810 nm、重复频率为1 kHz的飞秒激光脉冲的光谱相位,测量精度在0.1 rad以内.根据测量结果,利用液晶空间光调制器对该飞秒激光脉冲进行相位补偿,得到了近似傅里叶变换极限的飞秒激光脉冲.这一装置将在多光子显微成像、脉冲整形、飞秒激光光谱学等众多领域发挥重要作用. 相似文献
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L. S. Lepnev A. A. Vaschenko A. G. Vitukhnovsky S. V. Eliseeva O. V. Kotova N. P. Kuzmina 《Journal of Russian Laser Research》2008,29(5):497-503
Organic light emitting diodes (OLEDs) based on zinc complexes with tetradentate Schiff bases — ZnSB [H2SB =H2Sal1, H2Sal2 (derivatives of salicylic aldehyde); H2MO1, H2MO2 (derivatives of o-vanillin)] display reversible and irreversible electroluminescence (EL) instability. The reversible
instability occurs after switching voltage on and the irreversible instability produced by UV light irradiation, heating,
and aging under the ambient conditions. In view of the results obtained, the first type of instability is associated with
the trap filling processes and the second type appearing at heating is possibly attributed to the changes in the interface
domains. Recommendations for the evaporation and capsulation conditions are provided. 相似文献