Numerically optimized FROG results for the study of red-shifted spectra in multi-frequency Raman generation
IIT Madras（印度理工学院马德拉斯分校）；University of Waterloo（滑铁卢大学）；Meta；Indian Institute of Science（印度科学学院）；IIT Bhubaneswar（印度理工学院布巴内斯瓦尔分校）；RWTH Aachen University（亚琛工业大学）
Sakthi Priya Amirtharaj, Zujun Xu, Donna Strickland, Borun Chowdhury, Sagnik Acharya, Priyam Samantray, Anil Prabhakar, Kisor Kumar Sahu, Franz Bamer, S. Swayamjyoti
When multifrequency Raman scattering is driven in the transient regime by two chirped pump pulses, the resulting anti-Stokes orders exhibit asymmetric spectral broadening toward lower frequencies, leading to a characteristic double-peaked structure in each order. In this Letter, frequency-resolved optical gating (FROG) is used to investigate the spectral evolution of the first anti-Stokes Raman component. To interpret the observed features, we introduce a double-pulse interference model and employ an adaptive learning-based reconstruction algorithm using the Adam optimizer to retrieve the temporal field evolution. The simulation results show good agreement with the experimental measurements. Our analysis indicates that the observed red-shifted spectral component originates from linear Raman processes within the two-photon dressed-state framework.
Experimental and theoretical study of red-shifted solitonic resonant radiation in photonic crystal fibers and generation of radiation seeded Raman solitons
A New Type of Two-photon Forward Radiation in Pure Liquids
在10^10Wcm-2或更小的80飞秒激光脉冲聚焦下，在纯水的正向双光子谱中观察到了一些意想不到的光谱特征，其强度远低于液态水的击穿或受激阈值。这两个宽的特征分别相对于超瑞利波长红移约2700 cm ~（-1）和5000 cm ~（-1），并且与激光强度成二次函数关系。它们与水的已知拉曼或超拉曼频率不匹配，并且它们都以向前方向的窄角度为中心。其他几种液体也表现出类似但分子特异性的光谱特征。
Oblique Bragg-Doppler scattering at relativistic grating created by backward Raman amplification in hydrogen
Russell Centre for Advanced Lightwave Science, Shanghai Institute of Optics and Fine Mechanics and Hangzhou Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (CAS)（中国科学院上海光学精密机械研究所杭州分院）；University of Chinese Academy of Sciences（中国科学院大学）；Zhejiang Key Laboratory of Microstructured Specialty Optical Fiber, Hangzhou Institute of Optics and Fine Mechanics（浙江省微结构特种光纤重点实验室，中国科学院上海光学精密机械研究所杭州分院）
Bright-state source cancellation in dissipative shortcut Raman atom optics
Qatar Center for Quantum Computing, College of Science and Engineering, Hamad Bin Khalifa University（卡塔尔量子计算中心，科学与工程学院，哈马德·本·哈利法大学）；School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM)（粒子与加速器学院，基础科学研究所）
