Intense white laser of high spectral flatness via optical-damage-free water–lithium niobate module  

作　　者：Lihong Hong Yuanyuan Liu Haiyao Yang Lingzhi Peng Mingzhou Li Yujie Peng Ruxin Li Zhi-Yuan Li 

机构地区：[1]Chinese Academy of Sciences,Shanghai Institute of Optics and Fine Mechanics,State Key Laboratory of High Field Laser Physics,Shanghai,China [2]South China University of Technology,School of Physics and Optoelectronics,Guangzhou,China

出　　处：《Advanced Photonics Nexus》2024年第1期61-67,共7页先进光子学通讯（英文）

基　　金：supported by the Science and Technology Project of Guangdong (Grant No.2020B010190001);the National Natural Science Foundation of China (Grant No.11974119);the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No.2016ZT06C594);the National Key R&D Program of China (Grant No.2018YFA 0306200).

摘　　要：A supercontinuum white laser with ultrabroad bandwidth,intense pulse energy,and high spectral flatness can be accomplished via synergic action of third-order nonlinearity(3rd-NL)and second-order nonlinearity.In this work,we employ an intense Ti:sapphire femtosecond laser with a pulse duration of 50 fs and pulse energy up to 4 mJ to ignite the supercontinuum white laser.Remarkably,we use water instead of the usual solid materials as the 3rd-NL medium exhibiting both strong self-phase modulation and stimulated Raman scattering effect to create a supercontinuum laser with significantly broadened bandwidth and avoid laser damage and destruction.Then the supercontinuum laser is injected into a water-embedded chirped periodically poled lithium niobate crystal that enables broadband and high-efficiency second-harmonic generation.The output white laser has a 10 dB bandwidth encompassing 413 to 907 nm,more than one octave,and a pulse energy of 0.6 mJ.This methodology would open up an efficient route to creating a long-lived,high-stability,and inexpensive white laser with intense pulse energy,high spectral flatness,and ultrabroad bandwidth for application to various areas of basic science and high technology.

关 键 词：intense white laser optical-damage-free water third-order nonlinearity second-order nonlinearity 

分 类 号：TN2[电子电信—物理电子学]