【摘 要】
：
The input pulse of the laser PEARL with energy of 18 J and pulse duration of about 60 fs was compressed to 10 fs after passage through a 4-mm-thick KDP crystal and reflection at two chirped mirrors with sum dispersion of -200 fs2. The experimen
【机 构】
：
InstituteofAppliedPhysicsoftheRussianAcademyofSciences,NizhnyNovgorod603950,Russia
【出 处】
：
HighPowerLaserScienceandEngineering
论文部分内容阅读
The input pulse of the laser PEARL with energy of 18 J and pulse duration of about 60 fs was compressed to 10 fs after passage through a 4-mm-thick KDP crystal and reflection at two chirped mirrors with sum dispersion of -200 fs2. The experiments were performed for the В-integral values from 5 to 19 without visible damage to the optical elements, which indicates that small-scale self-focusing is not a significant issue. It was shown that, by virtue of the low dispersion of the group velocity, the KDP crystal has some advantages over silica: a larger pulse compression coefficient, especially at a small value of the В-integral (B = 5, …, 9), lower absolute values of chirped mirror dispersion, and also a possibility to control the magnitude of nonlinearity and dispersion by changing crystal orientation.
其他文献
研究了AgGaS2晶体对TEA CO2 10.6微米激光的倍频特性。晶体厚度4.3毫米时倍频转换效率为0.122％。实测相位匹配角71.5％,调节宽度8°±1°。实验结果与理论计算值非常一致。
报道了研制主振-放大（MOPA）结构的高功率保偏掺镱脉冲光纤激光器并用其抽运光参变振荡器（OPO）的研究工作。掺镱脉冲光纤激光器以声光调Q的Nd∶YVO4激光器作为种子源, Liekki的大直径双包层保偏光纤作为放大介质, 得到接近基模的1064 nm波长激光输出, 最大线偏振输出功率17 W, 偏振消光比优于10 dB, 重复频率50 kHz, 脉冲宽度60 ns。利用该光纤激光作为抽运光, 抽运基于周期性畴极化反转掺镁铌酸锂（PPMgLN）晶体的宽带可调谐OPO, 实现了高效参量转换。在信号光1518
Cavity-coupled plasmonic structure is demonstrated to be a simple and effective tool to manipulatelight, enhance the biosensing figure of merit, and control the polarization state. In this Letter, we demonstrate the tunability of the chiroptical effect of
日本北海道大学的研究人员已利用动态散斑图案测量人体皮下的血流。以前其他研究人员的测量以激光多普勒测速方法为主。该法通过测量散射激光的多普勒频移成分推断血流的速度。但这些技术需要激光侵入性地(如用光纤探针或通过目视)直接进入血管。
驾驶员因素引发的交通事故比例居高不下,因此,研究基于驾驶员活动状态分析从而对异常驾驶行为进行正确识别分类的识别方法具有重要意义。提出一种基于协方差流形和基于二分类思想的多类LogitBoost分类器的异常驾驶行为识别方法。首先,提取图像的纹理、颜色和梯度方向等基础特征,以克服基于单一特征识别驾驶行为的不足;然后,利用协方差流形进行多特征融合,以消除特征冗余,同时降低由于不同特征数值差异过大而可能给
提出了一种用四焦点全息透镜实现的二维PS(Perfect Shuffle)和FPS(Folded PS)的方法，并给出了四焦点全息透镜的设计方法及应用于二维PS和FPS互连网络中的实验结果。
本文介绍了氧化铍放电管的特点,描述了一种氧化铍—金属结构氩离子激光器的基本构造。在内径3.8毫米、长36厘米的氧化铍放电管氩离子激光器中,在40安培电流下获得了0.86瓦的激光输出。
Photons with a great many tunable physical properties have been profoundly engaged in research of brain science in all aspects for more than a hundred years. Taking advantage of highly developed incoherent light sources, coherent lasers and short-pulse la
利用自行研制的单模光纤输出2.05 μm半导体激光器，采用外差检测技术，研究了 2.05 μm全光纤声光移频器的调制特性和偏转特性，实验结果表明，该器件的中心频率为104.5 MHz、布拉格带宽为8.92 MHz、布拉格角为41.63 mrad，最大衍射效率约为95%，其实验结果与理论分析相吻合，能够满足整个2.05 μm相干激光多普勒测风雷达系统的需要。