Implementation of temporal ptychography algorithm, I$^2$PIE, for improved single-beam coherent anti-Stokes Raman scattering measurements

基于倾斜入射多旋转角度融合叠层成像的超分辨率相干衍射成像

Super-Resolution Coherent Diffractive Imaging via Titled-Incidence Multi-Rotation-Angle Fusion Ptychography

针对相干衍射成像（CDI）受阿贝衍射极限限制的问题，提出倾斜入射多旋转角度融合叠层成像技术，结合tmf-PIE算法整合多角度数据，实现2倍分辨率增强并减轻伪影，为超分辨率成像提供新方案。

Rank-1 accelerated illumination recovery in scanning diffractive imaging by transparency estimation

We consider the problem of blind ptychography, that is the joint estimation of an unknown object and an illumination function from diffraction intensity measurements. In ptychography, diffraction measurements from neighboring regions of the same object are related to each other by a pairwise relationship between overlapping frames. When the illumination is well known, the relationship among frames is given by a linear projection operator. We propose a power iteration-projection algorithm that minimizes the global pairwise discrepancy among frames. We accelerate the convergence of power method …

Coherent microwave radiation emitted during the process of stimulated Raman scattering in weakly compressed hydrogen : experimental studies, together with an attempt to interpret this microwave emission

A coherent microwave radiation, concomitant with experiments of stimulated Raman scattering (SRS) in weakly compressed hydrogen, had been observed; qualitative and quantitative results had been obtained, and are given in this article. .An attempt to interpret this emission on a phenomenological basis is presented, on the basis of a model in which the influence of hydrogen molecule anharmonicity is taken into account, leading to two main effects:1) possible existence of an intermediate state involving a vibrationally excited quasiparticle system, the lifetime of which should be very short (0.1-…

轨道角动量对声子光散射的影响：实验检验

Orbital angular momentum impact on light scattering by phonons tested experimentally

本文用涡旋光实验检验 Bi$_4$Ge$_3$O$_{12}$ 中轨道角动量对声子拉曼散射的影响，结果否定静默模激活及 $E$ 模张量对称性降低的预测。

Dynamic local strain in graphene generated by surface acoustic waves

We experimentally demonstrate that the Raman active optical phonon modes of single layer graphene can be modulated by the dynamic local strain created by surface acoustic waves (SAWs). In particular, the dynamic strain field of the SAW is shown to induce a Raman scattering intensity variation as large as 15% and a phonon frequency shift of up to 10 cm$^{-1}$ for the G band, for instance, for an effective hydrostatic strain of 0.24% generated in a single layer graphene atop a LiNbO$_{3}$ piezoelectric substrate with a SAW resonator operating at a frequency of $ \sim $ 400 MHz. Thus, we demonstr…