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Effects of focusing conditions on femtosecond laser induced plasma fluorescence in air are investigated by using different focal length lenses. Under the tightly focusing condition, the fluorescence spectra are composed mainly of continuous spectrum and line spectra from N and O atoms, which is due to the higher laser intensity and corresponding higher electron density than those in the case of weakly focused laser beam. In the latter case, only line spectra from air molecules are observed. Besides, the intensity of line spectrum as a function of propagation distance is measured, which reveals the evolution of the plasma filaments.
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Keywords:
- femtosecond laser /
- plasma filaments /
- fluorescence spectra /
- optical breakdown
[1] Braun A, Korn G, Liu X, Du D, Squier J, Mourou G 1995 Opt. Lett. 20 73
[2] Talebpour A, Petit S, Chin S L 1999 Opt. Commun. 171 285
[3] Talebpour A, Abdel-Fattah M, Bandrauk A D, Chin S L 2001 Laser Phys. 11 68
[4] Gravel J F, Luo Q, Boudreau D, Tang X P, Chin S L 2004 Anal. Chem. 76 4799
[5] Hao Z Q, Zhang J 2004 Phys. 33 741 (in Chinese) [郝作强, 张 杰 2004 物理 33 741]
[6] Xu H L, Daigle J F, Luo Q, Chin S L 2006 Appl. Phys. B 82 655
[7] Luo Q, Xu H L, Hosseini S A, Daigle J F, Th′eberge F, Sharifi M, Chin S L 2006 Appl. Phys. B 82 105
[8] Xu H L, Kamali Y, Marceau C, Simard P T, Liu W, Bernhardt J, M′ejean G, Mathieu P, Roy G, Simard J R, Chin S L 2007 Appl. Phys. Lett. 90 1101
[9] Bernhardt J, Liu W, Th′eberge F, Xu H L, Daigle J F, Ch?ateauneuf M, Dubois J, Chin S L 2008 Opt. Commun. 281 1268
[10] Hao Z Q, Zhang J, Yu J, Zhang Z, Zhong J Y, Zang C Z, Jin Z, Wang Z H, Wei Z Y 2006 Acta Phys. Sin. 55 299 (in Chinese) [郝作强, 张杰, 俞进, 张喆, 仲佳勇, 臧充之, 金展, 王兆华, 魏志义 2006 55 299]
[11] Gibson G, Luk T S, Mcpherson A, Boyer K, Rhodes C K 1989 Phys. Rev. A 40 2378
[12] Zhang Z, Lu X, Liang W X, Hao Z Q, Zhou M L, Wang Z H, Liu X, Zhang J 2009 Opt. Express 17 3461
[13] Hao Z Q, Zhang J, Li Y T, Lu X, Yuan X H, Zheng Z Y, Wang Z H, Ling W J, Wei Z Y 2005 Appl. Phys. B 80 627
[14] Liu W, Luo Q, Chin S L 2003 Chin. Opt. Lett. 1 56
[15] Lofthus A, Krupenie P H 1977 J. Phys. Chem. Ref. Data 6 113
[16] Liu X L, Lu X, Liu X, Xi T T, Liu F, Ma J L, Zhang J 2010 Opt. Express 18 26007
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[1] Braun A, Korn G, Liu X, Du D, Squier J, Mourou G 1995 Opt. Lett. 20 73
[2] Talebpour A, Petit S, Chin S L 1999 Opt. Commun. 171 285
[3] Talebpour A, Abdel-Fattah M, Bandrauk A D, Chin S L 2001 Laser Phys. 11 68
[4] Gravel J F, Luo Q, Boudreau D, Tang X P, Chin S L 2004 Anal. Chem. 76 4799
[5] Hao Z Q, Zhang J 2004 Phys. 33 741 (in Chinese) [郝作强, 张 杰 2004 物理 33 741]
[6] Xu H L, Daigle J F, Luo Q, Chin S L 2006 Appl. Phys. B 82 655
[7] Luo Q, Xu H L, Hosseini S A, Daigle J F, Th′eberge F, Sharifi M, Chin S L 2006 Appl. Phys. B 82 105
[8] Xu H L, Kamali Y, Marceau C, Simard P T, Liu W, Bernhardt J, M′ejean G, Mathieu P, Roy G, Simard J R, Chin S L 2007 Appl. Phys. Lett. 90 1101
[9] Bernhardt J, Liu W, Th′eberge F, Xu H L, Daigle J F, Ch?ateauneuf M, Dubois J, Chin S L 2008 Opt. Commun. 281 1268
[10] Hao Z Q, Zhang J, Yu J, Zhang Z, Zhong J Y, Zang C Z, Jin Z, Wang Z H, Wei Z Y 2006 Acta Phys. Sin. 55 299 (in Chinese) [郝作强, 张杰, 俞进, 张喆, 仲佳勇, 臧充之, 金展, 王兆华, 魏志义 2006 55 299]
[11] Gibson G, Luk T S, Mcpherson A, Boyer K, Rhodes C K 1989 Phys. Rev. A 40 2378
[12] Zhang Z, Lu X, Liang W X, Hao Z Q, Zhou M L, Wang Z H, Liu X, Zhang J 2009 Opt. Express 17 3461
[13] Hao Z Q, Zhang J, Li Y T, Lu X, Yuan X H, Zheng Z Y, Wang Z H, Ling W J, Wei Z Y 2005 Appl. Phys. B 80 627
[14] Liu W, Luo Q, Chin S L 2003 Chin. Opt. Lett. 1 56
[15] Lofthus A, Krupenie P H 1977 J. Phys. Chem. Ref. Data 6 113
[16] Liu X L, Lu X, Liu X, Xi T T, Liu F, Ma J L, Zhang J 2010 Opt. Express 18 26007
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