We report on a systematic study of the laser polarization effect on a femtosecond laser filamentation in air.By changing the laser’s ellipticity from linear polarization to circular polarization, the onset position o...We report on a systematic study of the laser polarization effect on a femtosecond laser filamentation in air.By changing the laser’s ellipticity from linear polarization to circular polarization, the onset position of laser filament formation becomes farther from the focusing optics, the filament length is shorter, and less laser energy is deposited. The laser polarization effect on air filaments is supported by a simulation and analysis of the polarization-dependent critical power and ionization rates in air.展开更多
We demonstrate a simple technique to filter out the continuum background in filament-induced remote breakdown spectroscopy.By inserting a polarizer before the detector,the continuum background was reduced by more than...We demonstrate a simple technique to filter out the continuum background in filament-induced remote breakdown spectroscopy.By inserting a polarizer before the detector,the continuum background was reduced by more than 42%in filament-induced breakdown spectroscopy at a distance of 3.8 m,while the fluorescence intensity of aluminum atomic lines remains constant.Supercontinuum through self-phase modulation during filamentation mainly contributes to the continuum background.The polarization-gated technique provides a simple way to remove the continuum background in filament-induced remote breakdown spectroscopy.展开更多
基金supported in part by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB16000000)the Key Project from the Bureau of International Cooperation of the Chinese Academy of Sciences(No.181231KYSB20160045)+1 种基金the 100 Talents Program of the Chinese Academy of Sciencesthe support from Laval University in Canada
文摘We report on a systematic study of the laser polarization effect on a femtosecond laser filamentation in air.By changing the laser’s ellipticity from linear polarization to circular polarization, the onset position of laser filament formation becomes farther from the focusing optics, the filament length is shorter, and less laser energy is deposited. The laser polarization effect on air filaments is supported by a simulation and analysis of the polarization-dependent critical power and ionization rates in air.
基金supported in part by the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB16000000)the Key Project from Bureau of International Cooperation of Chinese Academy of Sciences(No.181231KYSB20160045)the 100Talents Program of Chinese Academy of Sciences
文摘We demonstrate a simple technique to filter out the continuum background in filament-induced remote breakdown spectroscopy.By inserting a polarizer before the detector,the continuum background was reduced by more than 42%in filament-induced breakdown spectroscopy at a distance of 3.8 m,while the fluorescence intensity of aluminum atomic lines remains constant.Supercontinuum through self-phase modulation during filamentation mainly contributes to the continuum background.The polarization-gated technique provides a simple way to remove the continuum background in filament-induced remote breakdown spectroscopy.
