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国家自然科学基金(60878018)

作品数:4 被引量:2H指数:1
相关作者:刘斌吕昆王梓夏元钦成向阳更多>>
相关机构:哈尔滨工业大学更多>>
发文基金:国家自然科学基金中央高校基本科研业务费专项资金更多>>
相关领域:理学机械工程更多>>

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飞秒激光扫描显微成像技术研究
利用飞秒激光脉冲作为光源开展显微成像研究,可以实现双光子荧光(TPEF two-photon excitation fluorescence)和三次谐波(THG third-harmonic generation)以及相...
夏元钦刘斌王梓张志斌董志伟樊荣伟陈德应
关键词:飞秒激光脉冲THGCARS显微成像
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高数值孔径物镜下CARS显微成像光场分布计算
2011年
为了更好地解释相干反斯托克斯拉曼散射(CARS)显微成像的基本原理,方便对CARS显微图像进行处理,使用角频谱的方法对物镜后的CARS显微成像光场分布进行了研究,计算了横向和轴向的光场分布随着物镜数值孔径以及入射光斑大小的变化情况。计算结果表明,光场分布的半峰全宽基本随着数值孔径的增大而减小,并且入射光束腰斑半径越大,CARS显微成像的分辨率也相对越高。理论计算工作为即将开展的实验奠定了基础。
夏元钦王梓刘斌吕昆成向阳陈德应吕志伟
关键词:光场分布
Role of highest occupied molecular orbitals in molecular field-free alignment by a femtosecond pulse
2009年
This paper studies the molecular rotational excitation and field-free spatial alignment in a nonresonant intense laser field numerically and analytically by using the time-dependent SchrSdinger equation. The broad rotational wave packets excited by the femtosecond pulse are defined in conjugate angle space, and their coefficients are obtained by solving a set of coupled linear equations. Both single molecule orientation angles and an ensemble of O2 and CO molecule angular distributions are calculated in detail. The numerical results show that, for single molecule highest occupied molecular orbital (HOMO) symmetry σ tends to have a molecular orientation along the laser polarization direction and the permanent dipole moment diminishes the mean of the orientation angles; for an ensemble of molecules, angular distributions provide more complex and additional information at times where there are no revivals in the single molecule plot. In particular, at the revival peak instant, with the increase of temperature of the molecular ensemble, the anisotropic angular distributions with respect to the laser polarization direction of the πg orbital gradually transform to the symmetrical distributions regarding the laser polarization vector and for two HOMO configurations angular distributions of all directions are confined within a smaller angle when the temperature of the molecular ensemble is higher.
陈德应王玉铨夏元钦樊荣伟张盛
Valence orbital method of calculating harmonic emission from diatomic molecule
2010年
We present a valence orbital method of calculating high-order harmonic generation from a diatomic molecule with arbitrary orientation by using a space rotation operator. We evaluate the effects of each valence orbital on harmonic emissions from N2 and O2 molecules in detail separately. The calculation results confirm the different properties of harmonic yields from N2 and O2 molecules which are well consistent with available experimental data. We observe that due to the orientation dependence of /sigma and /pi orbitals, the bonding orbital (π2pz)^2 of N2 determines the maximum of harmonic emission when the molecular axis of N2 is aligned parallel to the laser vector, and the magnitude of the high harmonic signal gradually weakens with the orientation angle of molecular axis increasing. But for O2 molecule the antibonding orbitals (π2pz)^1 and (π2pz)^1 contribute to the maximum of harmonic yield when O2 is aligned at 45° and bonding orbitals (π2pz)^2 and (π2pz)^2 slightly influence the orientation angle of maximum of harmonic radiation not exactly at 45°.
王玉铨陈德应夏元钦樊荣伟卢发铭
The dissociation pathways of N_2^+ in intense femtosecond laser fields被引量:2
2009年
Using a neutral N2 beam as target, this paper studies the dissociation of N2^+ in intense femtosecond laser fields (45 fs, ~ 1 × 10^16 W/cm^2) at the laser wavelength of 800 nm based on the time-of-flight mass spectra of N+ fragment ions. The angular distributions of N^+ and the laser power dependence of N^+ yielded from different dissociation pathways show that the dissociation mechanisms mainly proceed through the couplings between the metastable states (A, B and C) and the upper excited states of N^+.A coupling model of light-dressed potential energy curves of N2^+ is used to interpret the kinetic energy release of N^+.
陈德应张盛夏元钦
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