Robust and ultralow-energy-threshold ignition of a lean mixture by an ultrashort-pulsed laser in the filamentation regime

作     者：Hongwei Zang Helong Li Wei Zhang Yao Fu Shanming Chen Huailiang Xu Ruxin Li Hongwei Zang;Helong Li;Wei Zhang;Yao Fu;Shanming Chen;Huailiang Xu;Ruxin Li

作者机构：State Key Laboratory of Integrated OptoelectronicsCollege of ElectronicScience and EngineeringJilin University130012 ChangchunChina Instituteof Atomic and Molecular PhysicsJilin University130012 ChangchunChina CAS Center for Excellence in Ultra-intense Laser Science201800 ShanghaiChina State Key Laboratory of High Field Laser PhysicsShanghai lnstitute of Optics and Fine MechanicsChinese Academy of Sciences201800 ShanghaChina School of Physical Science and TechnologyShanghaiTech University201210 ShanghaiChina 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2021年第10卷第3期

页      面：320-326页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 082502[工学-航空宇航推进理论与工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0825[工学-航空宇航科学与技术] 0803[工学-光学工程] 

基　　金：The work is supported in part by the National Natural Science Foundation of China(61625501 and 62027822) the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM) 

主　　题：ultrashort laser energy 

摘      要：Laser ignition(LI)allows for precise manipulation of ignition tinning and location and is promising for green combustion of automobile and rocket engines and aero-turbines under lean-fuel conditions with improved emission efficiency;however,achieving completely effective and reliable ignition is still a ***,we report the realization of igniting a lean methane/air mixture with a 100%success rate by an ultrashort femtosecond laser,which has long been regarded as an unsuitable fuel ignition *** demonstrate that the minimum ignition energy can decrease to the sub-mJ level depending on the laser filamentation formation,and reveal that the resultant early OH radical yield significantly increases as the laser energy reaches the ignition threshold,showing a clear boundary for misfire and fire *** mechanisms for robust ultrashort LI are the filamentation-induced heating effect followed by exothermal chemical reactions,in combination with the line ignition effect along the *** results pave the way toward robust and efficient ignition of lean-fuel engines by ultrashort-pulsed lasers.