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A 45-μJ, 10-kHz,burst-mode picosecond optical parametric oscillator synchronously pumped at a second harmonic cavity 下载免费PDF全文
A novel high-energy picosecond optical parametric oscillator (OPO) was realized by placing an OPO in a second-harmonic (SH) cavity. In a proof-of-principle experiment, we demonstrated excellent burst energy of 45 μJ for the OPO signal at 900 nm that operates at a pulse repetition rate of 10 kHz and a pulse width of 46.8 ps. The beam quality was measured as $M^{2}_{x} = 1.44$ and $M^{2}_{y} = 1.40$ in the orthogonal directions, corresponding to an average beam factor $M^{2} = 1.42$. So far, this study is the first to investigate high-energy ps OPO synchronously pumped in a second-harmonic cavity. 相似文献
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We demonstrate a new management of multi-stage optical parametric generator(OPG)and amplifier(OPA)to obtain high-energy picosecond sources with high beam quality.The setup of multi-stage OPG-OPA requires mode-matching between the pump beam and the stable mode of the OPG-OPA.In a proof-of-principle experiment,the single-pass multi-stage OPG-OPA consists of three walk-off compensated KTP crystal pairs and two lenses,pumped by an 86 ps,1064 nm 10 kHz picosecond laser.The signal light at~1.77μm has an average output power of 502 mW with record energy up to 50.2μJ.The beam quality factor of the signal light can be improved toM2x ×M2yafter filtering out about 40%signal power.To the best of our knowledge,it is the first picosecond single-pass multi-stage OPG-OPA pumped at kHz regime. 相似文献
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苯胺是常用于染料制造、印染、橡胶、制药、塑料和油漆等的原料,其可通过呼吸道、消化道摄入人体,亦可通过皮肤吸收进入人体。苯胺对人体具有一定的毒害作用,主要是因为苯胺可使氧和血红蛋白转变为高铁血红蛋白,影响组织细胞供氧而造成内窒息。慢性中毒表现为神经系统症状和血象的变化,某些苯胺类化合物还具有致癌性[1]。苯胺类化合物一般在环境中有残留,因此分析环境样品中的苯胺类化合物十分重要。固体废物是指在生产建设、日常生活和其他活 相似文献
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α1-酸性糖蛋白柱拆分马来酸曲美布汀对映体 总被引:1,自引:0,他引:1
以α1-AGP为固定相,建立了马来酸曲美布汀的HPLC对映体拆分方法.考察了流动相pH、缓冲盐溶液的浓度、有机改性剂种类和浓度、流速、柱温等对对映体分离的影响.优化后的色谱条件为Chiral-AGP(100 mm×4.0 mm,5 μm)色谱柱,流动相为10 mmol/L醋酸铵缓冲液(pH 3.8);流速为0.4 mL/min;柱温为35℃.马来酸曲美布汀对映体的保留时间分别为7.4 min和9.8 min;分离度为1.59. 相似文献
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有机试剂在头发消化过程中的作用研究 总被引:1,自引:0,他引:1
利用有机试剂对蛋白质和油脂的作用,建立了一种不需加热的快速有效消化头发的新方法,并对其作用机理进行了探讨。 相似文献
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A High Conversion Efficiency Q-Switched Intracavity Nd:YVO_4/KTA Optical Parametric Oscillator under Direct Diode Pumping at 880nm 下载免费PDF全文
We report a high conversion efficiency Q-switched Nd:YVO_4/KTiOAsO_4(KTA) intracavity optical parametric oscillator(IOPO) operating near 3.5 um based on direct 880 nm laser diode(LD) pumping. A maximum average idler output power of 2.6 W with a pulse width of about 7.9 ns is achieved under an absorbed LD power of 45.4 W at a pulse repetition rate(PRR) of 10 kHz. The maximum optical-optical conversion efficiency from LD power to OPO mid-infrared(MIR) output of 6.74% is achieved. To our knowledge, this is the highest conversion efficiency for a KTA-IOPO by exploiting a Q-switched laser as the parent fundamental pump source. The beam quality factors M~2 of the MIR beam at the full output power with a PRR of 10 kHz are within 2.12 in both the horizontal and vertical directions, indicating a near Gaussian mode. 相似文献
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近年来,随着温室效应即全球变暖引发的环境问题越来越严峻,因此,CO2转化与再生引起了科学界的广泛关注,其中备受关注的是电催化CO2还原。而二维材料电催化剂可以将CO2还原为高附加值的多碳化合物,但催化剂的合成设计以及理论研究有待更多的研究。从发现石墨烯开始,二维材料的其他超薄层状结构的广泛研究逐渐出现。本文重点综述了石墨烯、MXenes、金属氧化物、二维MOFs和过渡金属硫族化合物等二维材料的构建以及其CO2还原电催化技术应用方面的最新进展,并简要的介绍了二维材料的分类和制备方法。讨论了电催化CO2还原的基本原理以及反应途径。指出了二维材料电催化剂面临的机遇和挑战,旨在对二维材料电催化剂的合成以及应用提供一些新的思路。 相似文献
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基于壳层隔绝纳米粒子增强拉曼光谱技术,合成了Au@SiO2纳米粒子,并对其进行了相关表征. 结果表明,包裹的二氧化硅层连续、致密,Au@SiO2膜/Ti电极上可获得金属钛电极上吸附吡啶分子的高质量表面增强拉曼光谱(SERS)信号. 通过Pt、Ni电极的测试,证实该信号源于吸附在基底表面的吡啶分子. 此外,Au@SiO2膜/Ti电极上吸附吡啶分子的现场SERS光谱研究表明,在-0.1 V ~ -0.6 V电位区间,吡啶分子平躺吸附,从-0.6 V起吸附的吡啶分子由平躺逐转变为垂直,而当电位为-1.2 V时,电极表面析氢,吡啶脱附. 相似文献