1 深圳大学土木与交通工程学院, 深圳 518060
2 低品位难处理黄金资源综合利用国家重点实验室, 龙岩 364200
中和渣(NS)是矿物开采和冶金处理过程中生成的以硫酸钙为主要成分的工业废渣, 中和渣大量堆积储存会给环境带来巨大威胁, 因此, 迫切需要探索一种回收利用中和渣的新技术。研究了不同粒化高炉矿渣掺量的中和渣基地质聚合物的力学性能, 并通过X射线衍射测试、反应热测试、压汞测试、傅里叶变换红外光谱测试和扫描电子显微镜测试等手段, 对中和渣基地质聚合物的物相组成、水化速率、孔结构及微观形貌进行了表征。结果表明: 在激发剂作用下, 中和渣与粒化高炉矿渣间地质聚合反应的主要产物为C(N)-A-S-H凝胶。粒化高炉矿渣的掺入可提高聚合反应速率, 生成更多的地质聚合物凝胶, 使得中和渣基地质聚合物微观结构更致密, 力学性能也更高。粒化高炉矿渣掺量为30%(质量分数)的中和渣基地质聚合物28 d抗压强度可达178 MPa。
地质聚合物 中和渣 粒化高炉矿渣 抗压强度 孔结构 微观结构 geopolymer neutralization slag granulated blast furnace slag compressive strength pore structure microstructure
Author Affiliations
Abstract
1 Department of Biomedical Engineering, Peking University, Beijing 100871, China
2 Department of Anatomy, School of Basic Medical Sciences, Peking University, Beijing 100191, China
3 Laboratory Animal Center, Peking University, Beijing 100871, China
4 School of Public Health, Jilin University, Changchun 130012, China
Since significant ocular differences in both anatomical structure and optical properties exist between rodents and humans, clinical imaging devices for human use are not suitable for use on rodents. In this study, we develop a contact probe with a flexible surface that can closely fit the rodent cornea for fundus imaging with a confocal scanning laser ophthalmoscope. Both Zemax simulation and in vivo fundus imaging demonstrate that this contact probe can significantly improve both the imaging quality and the operational convenience.
170.0170 Medical optics and biotechnology 170.4460 Ophthalmic optics and devices 170.5755 Retina scanning 170.2520 Fluorescence microscopy Chinese Optics Letters
2016, 14(3): 031701
Author Affiliations
Abstract
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
The influence on the level of amplified spontaneous emission (ASE) contrast resulting from the different seed pulse energies has been experimentally studied in a 10-TW-level femtosecond Ti:sapphire chirped pulse amplification laser. It is found that, with the seed pulse energy increasing, the ASE pedestal is suppressed more efficiently, and the ASE contrast is improved with a saturable tendency. The measurement of ~2×10-8 ASE contrast in the range of more than 50 ps before the main pulse is achieved in the laser.
对比度 自发辐射放大 飞秒啁啾脉冲放大激光器 320.0320 Ultrafast optics 140.0140 Lasers and laser optics Chinese Optics Letters
2010, 8(1): 123
Author Affiliations
Abstract
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Micro-lens arrays were adopted to homogenize the beam profile of 532-nm pumping laser for the main amplifier of an intense femtosecond, chirped pulse amplification (CPA) Ti:sapphire laser. Experimental measurements showed a great improvement of the near-field pattern of the CPA beam after the main amplifier and the size of the focal spot was improved from 2.7 times diffraction limitation (DL) to 1.6 DL. The spot size focused by an f/4 off-axis parabola (OAP) in the target chamber was measured to be 5.8 micron (full-width at half-maximum (FWHM)), and a peak intensity of 2.6*10^(20) W/cm2 was obtained at the output power of 120 TW. Peak intensity exceeding 10^(21) W/cm2 or even 10^(22) W/cm2 can be expected with smaller f-number focusing configuration and wavefront correction.
钛宝石激光器 超快激光 光束整形 微光学 140.3590 Lasers, titanium 140.7090 Ultrafast lasers 140.3300 Laser beam shaping 350.3950 Micro-optics Chinese Optics Letters
2006, 4(10): 583
中国科学院上海光学精密机械研究所强光光学重点实验室, 上海 201800
建成一台10 Hz,23TW掺钛蓝宝石激光装置,中心波长为790 nm.压缩后可在33.9fs期间输出778 mJ能量.并报道该激光装置的一些性能.
飞秒激光 啁啾脉冲放大 掺钛蓝宝石激光器
中国科学院上海光学精密机械研究所强光光学开放实验室, 上海 201800
从半经典理论的麦克斯韦-布洛赫方程出发, 对种子激光脉冲在再生和多程放大器中的放大过程进行了分析, 结合实际的物理条件得出了放大器的峰值输出的解析表达式, 并详细地分析了放大器的损耗和增益对峰值输出的提高和稳定的影响。 得出了一些对实际搭建工作具有指导意义的结论。
麦克斯韦-布洛赫方程 激光放大器 峰值输出 稳定性
中国科学院上海光机所强光光学开放实验室,上海 201800
报道了自行建立的一台钛宝石再生放大器,它将作为整套TW系统的首级放大装置,并通过实验研究了它在自由运转条件下的能量和时间工作特性：获得了10%的斜率效率;在45 mJ泵浦下得到了4 mJ的脉冲激光输出;脉冲建立时间稳定在350 ns左右,重复频率为10 Hz。这些性能指标初步验证了再生放大器的腔结构和光学布置的合理性,其稳定运转保证了将进行的种子注入和放大。
钛宝石再生放大器 自由振荡 能量与时间特性
采用中频感应加热提拉法生长出具有可饱和吸收性质的四价铬离子掺杂钇铝石榴石晶体（Cr4+:YAG）,实现了连续Nd:YAG激光的被动调Q高重复率脉冲输出。报道了Cr4+:YAG晶体存在一种光致附生损耗机制,并讨论了其对于调Q特性的重要影响。
调Q的稳定性 光致附生损耗
1 中国高等科学技术中心(世界实验室)理论物理分中心
2 西南交通大学应用物理系, 成都 610031
本文对波荡器(Wiggler)入口区绝热压缩磁场分布对自由电子激光输出功率、增益、效率的影响,进行了非线性计算机模拟.结果表明:磁场幅值沿轴向接立方函数分布,比通常采用的正弦平方函数和平方函数这两种分布更好,更接近实验值.
自由电子激光 波荡器 非线性
1 中国科学院上海光学精密机械研究所, 上海 201800
2 中国科学院感光化学研究所, 上海 201800
对透明和吸收介质的简并四波混频理论作了处理,实验上给出了掺半导体玻璃,无机和有机材料的三阶非线性极化率χ(3)和非线性折射率n2的值,而且确定了非线性参数χ(3)的时间响应特性,实验装置的时间分辨率为5 ps.
非线性参数 吸收介质 简并四波混频
