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Experimental study on emission spectra of air plasma induced by femtosecond laser pulses

Zhu Zhu-Qing Wang Xiao-Lei

Experimental study on emission spectra of air plasma induced by femtosecond laser pulses

Zhu Zhu-Qing, Wang Xiao-Lei
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  • Received Date:  02 September 2010
  • Accepted Date:  28 February 2011
  • Published Online:  15 August 2011

Experimental study on emission spectra of air plasma induced by femtosecond laser pulses

  • 1. Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210046, China;
  • 2. Key Laboratory of Optoelectronic Information Science and Technology of Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China

Abstract: The emission spectra produced in ambient air with focused strong femtosecond laser pulses are studied experimentally. The results show the emission spectrum presents the short-wavelength continuum spectrum with stronger intensity(cutoff wavelength 340 nm) and long-wavelength line spectrum with less weak intensity(near 800 nm). A similar spectrum shape can be acquired with fixed pulse width 50 fs and adjustable laser pulse energy. When the pulse energy is 1 mJ and the pulse width increases from 50 fs to 1ps, the peak value of continuum spectrum located in 500 nm wavelength becomes strong and gradually presents the line spectrum characteristics.

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