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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.
[1] Radziemski L J, Cremers D A 1989 Laser-induced Plasmas and Applications (Boca Raton: CRC) p295
[2] [3] Geertsen C, Mauchien P 1995 Collection in Application of Particle and Laser Beams in Materials Technology (Netherlands: Kluwer) p237
[4] [5] Telle H H 1996 Proc. SPIE 2730 160
[6] Sattmann R, Monch I, Krause H, Noll R, Couris S, Hatziapostolou A, Mavromanolakis A, Fotakis C, Larrauri E, Miguel R 1998 Appl. Spectrosc. 52 456
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[14] Lin Z X, Li X Y, Cheng X W, Li F Q, Gong S S 2003 Spectrosc. Spect. Anal. 23 421 (in Chinese)[林兆祥、李小银、程学武、李发泉、龚顺生 2003 光谱学与光谱分析 23 421]
[15] [16] [17] Li X Y, Lin Z X, Liu Y Y, Chen Y Q, Gong S S 2004 Acta Opt. Sin. 24 1051 (in Chinese)[李小银、林兆祥、刘煜炎、陈扬锓、龚顺生 2004 光学学报 24 1051]
[18] Lu X, Xi T T, Li Y J, Zhang J 2004 Acta Phys. Sin. 53 3404 (in Chinese)[鲁 欣、奚婷婷、李英竣、张 杰 2004 53 3404]
[19] [20] [21] Lin Z X, Wu J Q, Gong S S 2006 Acta Phys. Sin. 55 5892 (in Chinese)[林兆祥、吴金泉、龚顺生 2006 55 5892]
[22] [23] Corkum P B, Rolland C 1986 Phys. Rev. Lett. 57 2268
[24] Brodeur A, Chin S L 1998 Phys. Rev. Lett. 80 4406
[25] [26] Sirven J B, Bousquet B, Canioni L, Sarger L 2004 Spectrochim. Acta B 59 1033
[27] [28] [29] Baudelet M, Guyon L, Yu J, Wolf J P 2006 J. Appl. Phys. 99 084701
[30] Zhu X N, Fu R L 2003 Proc. SPIE 4914 58
[31] [32] Wang X L, Zhang N, Zhao Y B, Li Z L, Zhai H C, Zhu X N 2008 Acta Phys. Sin. 57 354 (in Chinese)[王晓雷、张 楠、赵友博、李智磊、翟宏琛、朱晓农 2008 57 354]
[33] -
[1] Radziemski L J, Cremers D A 1989 Laser-induced Plasmas and Applications (Boca Raton: CRC) p295
[2] [3] Geertsen C, Mauchien P 1995 Collection in Application of Particle and Laser Beams in Materials Technology (Netherlands: Kluwer) p237
[4] [5] Telle H H 1996 Proc. SPIE 2730 160
[6] Sattmann R, Monch I, Krause H, Noll R, Couris S, Hatziapostolou A, Mavromanolakis A, Fotakis C, Larrauri E, Miguel R 1998 Appl. Spectrosc. 52 456
[7] [8] Yalcin S, Crosley D R, Smith G P, Faris G W 1999 Appl. Phys. B 68 121
[9] [10] Vadillo J M, Milan M, Laserna J J 1996 J. Anal. Chem. 355 10
[11] [12] [13] Borghese A, Merola S S 1998 Appl. Opt. 37 3977
[14] Lin Z X, Li X Y, Cheng X W, Li F Q, Gong S S 2003 Spectrosc. Spect. Anal. 23 421 (in Chinese)[林兆祥、李小银、程学武、李发泉、龚顺生 2003 光谱学与光谱分析 23 421]
[15] [16] [17] Li X Y, Lin Z X, Liu Y Y, Chen Y Q, Gong S S 2004 Acta Opt. Sin. 24 1051 (in Chinese)[李小银、林兆祥、刘煜炎、陈扬锓、龚顺生 2004 光学学报 24 1051]
[18] Lu X, Xi T T, Li Y J, Zhang J 2004 Acta Phys. Sin. 53 3404 (in Chinese)[鲁 欣、奚婷婷、李英竣、张 杰 2004 53 3404]
[19] [20] [21] Lin Z X, Wu J Q, Gong S S 2006 Acta Phys. Sin. 55 5892 (in Chinese)[林兆祥、吴金泉、龚顺生 2006 55 5892]
[22] [23] Corkum P B, Rolland C 1986 Phys. Rev. Lett. 57 2268
[24] Brodeur A, Chin S L 1998 Phys. Rev. Lett. 80 4406
[25] [26] Sirven J B, Bousquet B, Canioni L, Sarger L 2004 Spectrochim. Acta B 59 1033
[27] [28] [29] Baudelet M, Guyon L, Yu J, Wolf J P 2006 J. Appl. Phys. 99 084701
[30] Zhu X N, Fu R L 2003 Proc. SPIE 4914 58
[31] [32] Wang X L, Zhang N, Zhao Y B, Li Z L, Zhai H C, Zhu X N 2008 Acta Phys. Sin. 57 354 (in Chinese)[王晓雷、张 楠、赵友博、李智磊、翟宏琛、朱晓农 2008 57 354]
[33]
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