Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser  

作　　者：Sang-Hoon Nam Garima CNagar Dennis Dempsey Ondrej Novák Bonggu Shim Kyung-Han Hong 

机构地区：[1]Research Laboratory of Electronics,Massachusetts Institute of Technology(MIT),Cambridge,MA 02139,USA [2]Department of Physics,Applied Physics and Astronomy,Binghamton University,State University of New York,Binghamton,NY 13902,USA [3]HiLASE Centre,Institute of Physics of the Czech Academy of Sciences,25241 DolníBrežany,Czech Republic [4]Presently with MIT Lincoln Laboratory,Lexington,MA 02420,USA

出　　处：《High Power Laser Science and Engineering》2021年第1期109-117,共9页高功率激光科学与工程（英文版）

基　　金：supported by the US DOE accelerator stewardship program(grant number DE-SC0018378);US DOD Office of Navy Research(ONR)DURIP(grant number N00014-17-1-2744);National Science Foundation(NSF)(grant number PHY-1707237);Air Force Office of Scientific Research(AFOSR)(grant number FA9550-18-1-0223);Integrated Electronics Engineering Center(IEEC)of Binghamton University;ERDF and the state budget(grant number CZ.02.1.01/0.0/0.0/15006/0000674);MEYS(grant number LO1602,LM2015086)of the Czech Republic;EU Horizon 2020(grant number 739573)。

摘　　要：We present experimental and numerical investigations of high-energy mid-infrared filamentation with multi-octavespanning supercontinuum generation(SCG), pumped by a 2.4 μm, 250 fs Cr:ZnSe chirped-pulse laser amplifier.The SCG is demonstrated in both anomalous and normal dispersion regimes with YAG and polycrystalline ZnSe,respectively. The formation of stable and robust single filaments along with the visible-to-mid-infrared SCG is obtained with a pump energy of up to 100 μJ in a 6-mm-long YAG medium. To the best of the authors’ knowledge, this is the highest-energy multi-octave-spanning SCG from a laser filament in a solid. On the other hand, the SCG and evenharmonic generation based on random quasi-phase matching(RQPM) are simultaneously observed from the single filaments in a 6-mm-long polycrystalline ZnSe medium with a pump energy of up to 15 μJ. The numerical simulations based on unidirectional pulse propagation equation and RQPM show excellent agreement with the measured multioctave-spanning SCG and even-harmonic generation. They also reveal the temporal structure of mid-infrared filaments,such as soliton-like self-compression in YAG and pulse broadening in ZnSe.

关 键 词：laser filamentation mid-infrared laser nonlinear optics ultrafast optics 

分 类 号：TN248[电子电信—物理电子学]