Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion
P. A. Carpeggiani, G. Coccia, G. Fan, E. Kaksis, A. Pugžlys, A. Baltuška, R. Piccoli, Y. -G. Jeong, A. Rovere, R. Morandotti, L. Razzari, B. E. Schmidt, A. A. V… 展开作者
P. A. Carpeggiani, G. Coccia, G. Fan, E. Kaksis, A. Pugžlys, A. Baltuška, R. Piccoli, Y. -G. Jeong, A. Rovere, R. Morandotti, L. Razzari, B. E. Schmidt, A. A. Voronin, A. M. Zheltikov
Ultrashort high-energy pulses at wavelengths longer than 1 $μ$m are nowadays desired for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband pulses still relies on optical parametric amplification (OPA), which often requires multiple and complex stages, may feature imperfect beam quality and has limited conversion efficiency into one of the amplified waves. In this work, we present a completely different strategy to realize an energy-efficient and scalable laser frequency shifter. This relies on the continuous red shift provided by stimulated Raman scattering (SRS) over a long propagation distance in nitrogen-filled hollow core fibers (HCF). We show a continuous tunability of the laser wavelength from 1030 nm up to 1730 nm with conversion efficiency higher than 70% and high beam quality. The highly asymmetric spectral broadening, arising from the spatiotemporal nonlinear interplay between high-order modes of the HCF, can be readily employed to generate pulses (~20 fs) significantly shorter than the pump ones (~200 fs) with high beam quality, and the pulse energy can further be scaled up to tens of millijoules. We envision that this technique, coupled with the emerging high-power Yb laser technology, has the potential to answer the increasing demand for energetic multi-TW few-cycle sources tunable in the near-IR.
FLASH: Ultrafast beam quality characterization via spatial-to-temporal mapping
Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, Huazhong University of Science and Technology（武汉光电国家实验室，华中科技大学光学与电子信息学院）
Raman suppression in nanophotonics enabled by multimode spectral filtering
John A. Paulson School of Engineering and Applied Sciences, Harvard University（哈佛大学约翰·A·保尔森工程与应用科学学院）；Quantum Science and Engineering, Harvard University（哈佛大学量子科学与工程）；Department of Physics, University of Auckland（奥克兰大学物理系）；The Dodd-Walls Centre for Photonic and Quantum Technologies（多德-沃尔斯光子与量子技术中心）
High-order correlations and ultrafast Wigner negativities in bright-squeezed-vacuum-driven high-harmonic generation
Max Planck Institute for the Structure and Dynamics of Matter（马普固体与结构研究所）；Guangdong Technion-Israel Institute of Technology（广东以色列理工学院）；Technion–Israel Institute of Technology（以色列理工学院）；Initiative for Computational Catalysis (ICC), Flatiron Institute（Flatiron研究所计算催化倡议）
Real-Time Visualization of the Spatiotemporal Dynamics of 3D Solitons
State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications（北京邮电大学电子工程学院信息光子学与光通信国家重点实验室）
Direct observation of ultrafast defect-bound and free exciton dynamics in defect-engineered WS$_2$ monolayers
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory（橡树岭国家实验室纳米材料科学中心）；Center for Integrated Nanotechnologies, Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室集成纳米技术中心）；Honda Research Institute USA Inc.（本田美国研究院）；Department of Materials Science and Engineering, University of Tennessee, Knoxville（田纳西大学诺克斯维尔分校材料科学与工程系）
University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory（斯坦福同步辐射光源，斯坦福直线加速器中心）；Institute for Laser Science, The University of Electro-Communications（电子通信大学激光科学研究所）；RIKEN SPring-8 Center（理化学研究所SPring-8中心）；Research Center for Precision Engineering, Graduate School of Engineering, Osaka University（大阪大学大学院工学研究系精密工程研究中心）；Department of Advanced Materials Science, The University of Tokyo（东京大学先进材料科学系）；Japan Synchrotron Radiation Research Institute（日本同步辐射研究机构）；Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器研究所自由电子激光科学中心）；Department of Physics, Universität Hamburg（汉堡大学物理系）；Stanford PULSE Institute. SLAC National Accelerator Laboratory（斯坦福PULSE研究所，斯坦福直线加速器中心）；Department of Applied Physics, Stanford University（斯坦福大学应用物理系）
