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The whole process of the electron thermal emission by ultrafast pulsed laser is studied in the paper. When an ultra-short laser pulse interaction with the target film, first of all, the incident laser excites free electrons within the absorption depth, next, electron energy is transferred to nearby lattice through the heat transfer systems of the free electron and lattice, and by the thermal coupling between the electron and the lattice, the energy is delivered to the internal material. Therefore, in a short period of ps and shorter, the energy coupling of the electron and lattice can not be established. So that the electron temperature is much higher than the lattice temperature, the electron thermal emission becomes apparent. The characteristics of thermionic emission of the films during ultrashort pulse laser ablation are investigated using two-temperature model coupled with the Richardson-Dushman equation. It is found that electron thermal emission can significantly change the development of electron and lattice temperatures, meanwhile, the film thickness and laser fluence directly affect electron thermal emission.
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Keywords:
- laser ablation /
- two-temperature model /
- electron emission
[1] Nolte S, Momma C, Jacobs H 1997 J. Opt. Soc. Am. B 14 2716
[2] Bulgakova N M 2004 Phys. Rev. B 69 54102
[3] Gu Y Q, Cai D F, Zheng Z J, Yang X D, Zhou W M, Jiao C Y, Chen H, Wen T S, Chunyu S T 2005 Acta Phys. Sin. 54 186 (in Chinese)[谷渝秋、蔡达锋、郑志坚、杨向东、周维民、焦春晔、陈 豪、温天舒、淳于书泰 2005 54 186]
[4] Xu M H, Liang T J, Zhang J 2006 Acta Phys. Sin. 55 2357 (in Chinese) [徐妙华、梁天骄、张 杰 2006 55 2357]
[5] Li K, Li Y T, Zhang J, Yuan X H, Xu M H, Wang Z H, Zhang J 2006 Acta Phys. Sin. 55 5909 (in Chinese) [李 昆、李玉同、张 军、远晓辉、徐妙华、王兆华、张 杰 2006 55 5909]
[6] Huang W Z, Li Y T, Xiong Y, Zhang S G, Wen X L, Hong W, Gu Y Q, Wen T S, He Y L 2008 Acta Phys. Sin. 57 111 (in Chinese) [黄文忠、李玉同、熊 勇、张双根、温贤伦、洪 伟、谷渝秋、温天舒、何颖玲 2008 57 111]
[7] Corkum P B, Brunel F, Sherman N K 1988 Phys. Rev. Lett. 61 2886
[8] Zhigilei L V, Lin Z B, Ivanov D S 2009 J. Phys. Chem. C 113 11892
[9] Cheng J, Perrie W, Sharp M, Edwardson S P 2009 Appl. Phys. A 95 739
[10] Gan Y, Chen J K 2009 Appl. Phys. Lett. 94 201116
[11] Hu D Z 2009 Acta Phys. Sin. 58 1077 (in Chinese) [胡德志 2009 58 1077]
[12] Allen P B 1987 Phys. Rev. Lett. 59 1460
[13] Wang X Y, Riffe D M, Lee Y S 1994 Phys. Rev.B 50 8016
[14] Huang J, Zhang Y W, Chen J K 2009 Appl. Phys. A 95 643
[15] Qiu T Q, Tin C L 1993 J. Heat Trans. 115 835
[16] Unal A A, Stalmashonak A, Seifert G, Graener H 2009 Phys. Rev.B 79 115411
[17] Chen J K, Beraun J E 2003 J. Opt. A: Pure Appl. Opt. 5 168
[18] Kim J, Na S 2007 Opt. Laser Technol. 39 1443
[19] Yang J J, Liu W W, Zhu X N 2007 Chin. Phys. 16 2003
[20] Tang J 2008 Appl. Phys. Lett. 92 11901
[21] Tai P T, Yu P, Tang J 2009 J. Phys. Chem. C 113 15014
[22] Smith A L, Breitwieser R 1970 J. Appl. Phys. 41 436
[23] Jiang L, Tsai H L 2006 J. Appl. Phys. 100 23116
[24] Jiang L, Tsai H L 2005 J. Heat Trans.127 1167
[25] Christensen B H, Vestentoft K, Balling P 2006 Appl. Surf. Sci. 253 6347
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[1] Nolte S, Momma C, Jacobs H 1997 J. Opt. Soc. Am. B 14 2716
[2] Bulgakova N M 2004 Phys. Rev. B 69 54102
[3] Gu Y Q, Cai D F, Zheng Z J, Yang X D, Zhou W M, Jiao C Y, Chen H, Wen T S, Chunyu S T 2005 Acta Phys. Sin. 54 186 (in Chinese)[谷渝秋、蔡达锋、郑志坚、杨向东、周维民、焦春晔、陈 豪、温天舒、淳于书泰 2005 54 186]
[4] Xu M H, Liang T J, Zhang J 2006 Acta Phys. Sin. 55 2357 (in Chinese) [徐妙华、梁天骄、张 杰 2006 55 2357]
[5] Li K, Li Y T, Zhang J, Yuan X H, Xu M H, Wang Z H, Zhang J 2006 Acta Phys. Sin. 55 5909 (in Chinese) [李 昆、李玉同、张 军、远晓辉、徐妙华、王兆华、张 杰 2006 55 5909]
[6] Huang W Z, Li Y T, Xiong Y, Zhang S G, Wen X L, Hong W, Gu Y Q, Wen T S, He Y L 2008 Acta Phys. Sin. 57 111 (in Chinese) [黄文忠、李玉同、熊 勇、张双根、温贤伦、洪 伟、谷渝秋、温天舒、何颖玲 2008 57 111]
[7] Corkum P B, Brunel F, Sherman N K 1988 Phys. Rev. Lett. 61 2886
[8] Zhigilei L V, Lin Z B, Ivanov D S 2009 J. Phys. Chem. C 113 11892
[9] Cheng J, Perrie W, Sharp M, Edwardson S P 2009 Appl. Phys. A 95 739
[10] Gan Y, Chen J K 2009 Appl. Phys. Lett. 94 201116
[11] Hu D Z 2009 Acta Phys. Sin. 58 1077 (in Chinese) [胡德志 2009 58 1077]
[12] Allen P B 1987 Phys. Rev. Lett. 59 1460
[13] Wang X Y, Riffe D M, Lee Y S 1994 Phys. Rev.B 50 8016
[14] Huang J, Zhang Y W, Chen J K 2009 Appl. Phys. A 95 643
[15] Qiu T Q, Tin C L 1993 J. Heat Trans. 115 835
[16] Unal A A, Stalmashonak A, Seifert G, Graener H 2009 Phys. Rev.B 79 115411
[17] Chen J K, Beraun J E 2003 J. Opt. A: Pure Appl. Opt. 5 168
[18] Kim J, Na S 2007 Opt. Laser Technol. 39 1443
[19] Yang J J, Liu W W, Zhu X N 2007 Chin. Phys. 16 2003
[20] Tang J 2008 Appl. Phys. Lett. 92 11901
[21] Tai P T, Yu P, Tang J 2009 J. Phys. Chem. C 113 15014
[22] Smith A L, Breitwieser R 1970 J. Appl. Phys. 41 436
[23] Jiang L, Tsai H L 2006 J. Appl. Phys. 100 23116
[24] Jiang L, Tsai H L 2005 J. Heat Trans.127 1167
[25] Christensen B H, Vestentoft K, Balling P 2006 Appl. Surf. Sci. 253 6347
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