宽带飞秒脉冲双折射干涉滤波的研究

对宽带飞秒脉冲双折射干涉滤波进行了理论和实验研究。首先给出了一种新型的双折射干涉滤波器的原理和设计，得到了输出滤波光谱强度分布的解析表达式。然后进行了15fs宽带脉冲的干涉滤波的实验研究，实验得到了一组性能良好的透射和反射输出的干涉滤波谱图，实验测量与理论计算基本一致。同时还分析了群速失配以及色散对宽带飞秒脉冲双折射干涉滤波的影响。结果表明这种滤波器对宽带飞秒脉冲有很好的干涉滤波作用，能同时前向透射和侧向反射干涉滤波输出，且无插入功率损耗，可以用来获得波长稳定的多波长可调谐超短脉冲光源。对于飞秒脉冲干涉滤波器的设计和应用具有重要的参考价值。     

掺Yb3+双包层光纤中的绿光荧光分析

普通单模光纤与掺Yb³⁺双包层光纤熔接后,当用波长为976nm激光耦合时,实验观察到掺Yb³⁺双包层光纤中呈现绿色的荧光并用光谱仪进行了测试分析表明:绿色荧光的产生为Yb³⁺离子间相互作用引起合作能量转移(CET)过程,这种能量转移过程将降低光纤激光器和光纤放大器的量子效率。     

Three-dimensional optical data storage using a solid immersion lens to focus a femtosecond laser pulse

A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Tiisapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1×10 2 b/cm3. Some advantages of the employment of SIL have been discussed.     

Three-dimensional optical storage in fused silica using modulated femtosecond pulses

Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading (phase-contrast) and a serial reading (confocal-type) methods. The method for modulating laser pulses can also be used in all of pulsed laser systems which operate in cavity-dumping configuration.     

吲哚俘精酰胺的偏振全息图像光存储实验研究

在吲哚俘精酰胺/PMMA薄膜上记录了同偏振全息和正交偏振全息图，获得了它们的再现衍射像.实验结果表明：吲哚俘精酰胺具有光致各向异性，可以进行正交偏振全息记录.在偏振全息中，衍射光的偏振方向依赖于物光和再现光的偏振方向，衍射像的噪声主要来源于再现光照射到样品上引起的散射.正交偏振全息可以得到比同偏振全息更高信噪比的衍射像.存储于样品上的全息图在室温下黑暗处至少可以保存五个月而衍射效率无明显下降.结果表明，吲哚俘精酰胺是一种可用于偏振全息的可擦重写记录介质. 关键词： 偏振全息 光致各向异性 俘精酸酐 光致变色     

High-power double-clad large-mode-area photonic crystal fiber laser

High power fiber lasers based on ytterbium-doped large- mode-area photonic crystal fiber (LMA PCF) have been the focus of considerable research[1-3]. Output powers up to 260 W based on the LMA PCF were obtained without any thermo-optical problems or reduction in slope efficiency, only limited by the available pump diode lasers[3]. High power fiber lasers based on the conventional ytterbium-doped step-index fibers require relatively large mode areas to avoid the fiber surface damage caused…     

Three-dimensional optical data storage using a solid immersion lens to focus a femtosecond laser pulse

A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical datastorage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Ti:sapphire laser,the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at adensity of 1.1× 1012b/cm3. Some advantages of the employment of SIL have been discussed.     

种子注入的短脉冲激光器特性研究

 从LD泵浦固体激光器优化设计原则出发，设计了一种微型二极管泵浦激光器，并对种子激光器的结构和参数进行了优化。该激光器运转稳定，输出光束质量高，光束发散角小，光-光转化效率为17-4%，斜率效率可达24%，输出功率可达80mW。将此种子激光注入到调Q激光器中，改善了调Q激光器的输出特性，使得激光脉冲的建立时间缩短了40ns，输出的横模场分布得到了明显改善。     

高功率单模Er~(3+)∶Yb~(3+)共掺双包层光纤激光器

给出了单模输出的铒镱共掺双包层光纤激光器(EYDCFL)的数值分析及最新实验结果.基于速率方程及功率传输方程,对单模EYDCFL进行数值分析,从理论上对其性能进行优化.然后,在相同条件下进行了EYDCFL的实验研究.描述了输出激光功率随入纤泵浦功率和光纤长度的变化以及输出激光波长随光纤长度的变化.在光纤长度为6.3m时,获得了波长为1566nm、最大功率为2.2W的单模激光输出,整体光-光转换效率22%,这是目前国内用该类光纤获得的最高单模输出功率.     

不同宽度脉冲激光对白宝石损伤的结构特征

研究了白宝石（〈0001〉切割）晶体在800nm ns、ps和fs激光脉冲作用下的损伤形态.实验发现,在纳秒脉冲作用下，损伤外型与晶体的结构参量一致，呈“米”字形；在皮秒激光脉冲作用下，损伤外型呈“十”字形；而在飞秒激光脉冲作用下，损伤外形呈“一”字形；说明白宝石晶体结构损伤与应力作用下晶体缺陷的择优取向有关.