Abstract：To improve the quality of laser-induced breakdown spectroscopy, nanosecond pulse laser generated by Nd∶YAG laser was used to excite soil sample. The intensity and signal-to-background ratio of Al Ⅰ 394.401 nm, Ba Ⅰ 455.403 nm, Fe Ⅰ 430.791 nm and Ti Ⅰ 498.173 nm were observed using a grating spectrometer and a photoelectric detection system. The effects of laser shot frequency(5，10 and 15 Hz)on the radiation characteristics of laser-induced plasma was studied. The experimental results show that as compared with the laser shot frequency of 5 Hz, the spectral line intensity of Al, Ba, Fe and Ti increased by about 50.94%, 112.7%, 107.46%, and 99.38% at 15 Hz respectively under the same laser energy, while the spectral signal-to-background ratio increased byabout 15.16%, 24.08%, 40.26% and 72.06% respectively. The effects mechanism of the laser shot frequency on radiation characteristics of plasma is explained by measuring plasma parameters.
Key words：Laser-induced plasma;Laser shot frequency;Spectral line intensity;Signal-to-background ratio
陈金忠，白津宁，宋广聚，孙 江，邓泽超，王英龙. 激光脉冲重复频率对等离子体辐射特性的影响[J]. 光谱学与光谱分析, 2012, 32(11): 2916-2919.
CHEN Jin-zhong, BAI Jin-ning, SONG Guang-ju, SUN Jiang, DENG Ze-chao, WANG Ying-long. Effects of Laser Shot Frequency on Plasma Radiation Characteristics. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 2916-2919.
[1] Pandhija S, Rai N K, Rai A K, et al. Appl. Phys. B, 2010, 98: 231. [2] Popov A M, Colao F, Fantoni R. J. Anal. At. Spectrom., 2010, 25: 837. [3] Gaft M, Nagli L, Fasaki I, et al. Spectrochim. Acta Part B, 2009, 64(10): 1098. [4] Death D L, Cunningham A P, Pollard L J. Spectrochim Acta Part B, 2008, 63(7): 763. [5] Galmed A H, Kassem A K, Von Bergmann H, et al. Appl. Phys. B, 2011, 102: 197. [6] Gupta G P, Suri B M, Verma A, et al. Alloys Compd., 2011, 509(9): 3740. [7] Hamzaoui S, Khleifia R, Jaidane N, et al. Lasers Med. Sci., 2011, 26: 79. [8] EI-Hussein A, Kassem A K, Ismail H. Talanta, 2010, 82(2)：495. [9] CHEN Jin-zhong, ZHANG Lin-jing, SUN Jiang，et al(陈金忠，张琳晶，孙 江，等). Chinese Science Bulletin(科学通报)，2011, 56(4-5): 299. [10] Pandhija S, Rai N K, Rai A K, et al. Appl. Phys. B, 2010, 98(1): 231. [11] ZHANG Yang, JIN Xing, XIN Chao-jun(张 杨，金 星，辛朝军). High Power Laser and Particle Beams(强激光与粒子束), 2009, 21(9): 1326. [12] NIST Atomic Spectra Database, http://physics.nist.gov. Kurucz output Atomic Spectral Line database from R.L.Kurucz’s CD-ROM 23. [13] Shaikh N M, Hafeez S, Kalyar M A, et al. Appl. Phys., 2008, 104(10): 103108.
