【摘 要】
：
We theoretically investigate the attosecond pulse generation in an orthogonal multicycle midinfrared two-color laser field. It is demonstrated that multiple continuum-like humps, which consist of about twenty orders of harmonics and an intensity of about
【机 构】
：
ShanghaiInstituteofOpticsandFineMechanics,ChineseAcademyofSciences,Shanghai201800,ChinaUniversityofC
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
We theoretically investigate the attosecond pulse generation in an orthogonal multicycle midinfrared two-color laser field. It is demonstrated that multiple continuum-like humps, which consist of about twenty orders of harmonics and an intensity of about one order higher than the adjacent normal harmonics, are generated when longer wavelength driving fields are used. By filtering these humps, intense isolated attosecond pulses (IAPs) are directly generated without any phase compensation. Our proposal provides a simple technique to generate intense IAPs with various central photon energies covering the multi-keV spectral regime by using multicycle midinfrared driving pulses with high pump energy in the experiment.
其他文献
物理实验对神光II装置的输出脉冲波形有很高的精度要求。对于单色光，通常做法是利用增益通量曲线反演激光链路获得注入波形，该方法在求解高通量或复杂波形时的精度比较差，甚至对宽带脉冲失效。针对不同输出通量，提出了智能算法和增益通量曲线的分层使用策略并应用于神光II全链路的波形反演，混合算法的计算精度理论上取决于采样点数目。通过模拟仿真验证了混合算法具有稳定性好、精度高和收敛快的特点。
Tantalum pentoxide thin films are prepared by oblique angle electron beam evaporation. The influence of flux angle on the surface morphology and microstructure is investigated by scanning electron microscopy (SEM). The Ta
涡旋光是一种携带轨道角动量、相位面呈螺旋状分布的新型结构光场,在量子纠缠、量子通信、光学微操控等领域已经获得了广泛应用。随着研究的深入,具有比传统涡旋光更复杂的拓扑结构、相位奇点、轨道角动量和偏振奇点的结构光场的产生,吸引了众多研究人员的兴趣。从固体激光腔内直接激发产生空间结构光和腔外调控得到空间结构光出发,分别介绍了离轴泵浦加像散转换、调制元件调制波形、泵浦整形三种腔内方法,以及空间光调制器光场定制、模式叠加、超构表面微结构设计的三种腔外方法,并分析比较了几种方法的优缺点,展望了未来空间涡旋结构光场的发
叶绿素含量的快速估算对于及时了解作物的长势、 病虫害监测以及产量的评估都具有重要意义。 利用自主研发的多角度成像观测系统获取了不同生育期玉米的高光谱影像, 精确地提取出主平面内各个观测角度下玉米冠层的反射率。 通过对ACRM模型模拟值和实测值的分析, 计算出玉米冠层红波段下的热点-暗点指数（HDS）, 并利用该指数对TCARI进行改进, 提出一个基于多角度观测的新型植被指数HD-TCARI, 最后使用多角度高光谱成像数据对其进行了地面验证。 结果表明, HD-TCARI能够减小LAI对叶绿素估算的影响,
Structural coloration techniques have improved display science due to their high durability in terms of resistance to bleaching and abrasion, and low energy consumption. Here, we propose and demonstrate an all-solid-state, large-area, lithography-free col
A new type of optical parametric chirped pulse amplifier is designed and analyzed for the amplification of pulse centered at 808 nm. A novel crystal, yttrium calcium oxyborate YCa4O(BO3)3 (YCOB), is utilized in the power amplification stage of optical par
A simple and compact optical fiber directional bending vector sensor with simultaneous measurement of temperature based on the Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. The device consists of a piece of photonic crysta
本文计算了玻璃中Er~(3 )离子的受激发射截面、量子效率,分析了其泵浦特性,估计了掺Er~(3 )离子玻璃得到激光振荡的能力,确定出合适的基质玻璃系统。