[1] [1] De Giacomo A, Dell’Aglio M, De Pascale O. Single pulse-laser induced breakdown spectroscopy in aqueous solution[J]. Applied Physics A, 2004, 79(4-6): 1035-1038.

[2] [2] Tian Y, Xue B, Song J, et al. Comparative investigation of laser-induced breakdown spectroscopy in bulk water using 532- and 1064-nm lasers[J]. Applied Physics Express, 2017, 10(7): 072401.

[3] [3] Li Ying, Wang Zhennan, Wu Jianglai, et al. Effects of laser wavelength on detection of metal elements in water solution by laser induced breakdown spectroscopy[J]. Spectroscopy and Spectral Analysis, 2012, 32(3):582-585 (in Chinese).

[4] [4] SongJiaojian, Tian Ye, Lu Yuan, et al. Comparative investigation of underwater-LIBS using 532 nm and 1064 nm lasers[J]. Spectroscopy and Spectral Analysis, 2014, 34(11): 3104-3108 (in Chinese).

[5] [5] Kennedy P K, Hammer D X, Rockwell B A. Laser-induced breakdown in aqueous media[J]. Progress in Quantum Electronics, 1997, 21(3): 155-248.

[6] [6] XueBoyang, Tian Ye, Song Jiaojian, et al. Study on the spatial distribution of laser plasma emission underwater with different laser energies[J]. Spectroscopy and Spectral Analysis, 2016, 3(4): 1186-1190 (in Chinese).

[7] [7] Thornton B, Ura T. Effects of pressure on the optical emissions observed from solids immersed in water using a single pulse laser[J]. Applied Physics Express, 2011, 4(2): 2702.

[8] [8] Tian Y, Xue B, Song J, et al. Stabilization of laser-induced plasma in bulk water using large focusing angle[J]. Applied Physics Letters, 2016, 109(6): 515-7.

[9] [9] Tian Y, Xue B, Song J, et al. Non-gated laser-induced breakdown spectroscopy in bulk water by position-selective detection[J]. Applied Physics Letters, 2015, 107(11): 297-103.

[10] [10] Giacomo A D, Dell’Aglio M, Colao F, et al. Double-pulse LIBS in bulk water and on submerged bronze samples[J]. Applied Surface Science, 2005, 247(1): 157-162.

[11] [11] Casavola A, De Giacomo A, Dell’Aglio M, et al. Experimental investigation and modelling of double pulse laser induced plasma spectroscopy under water[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2005, 60(7): 975-985.

[12] [12] De Giacomo A, Dell’Aglio M, De Pascale O, et al. From single pulse to double pulse ns-laser induced breakdown spectroscopy under water: elemental analysis of aqueous solutions and submerged solid samples[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2007, 62(8): 721-738.

[13] [13] De Giacomo A, Dell’Aglio M, Bruno D, et al. Experimental and theoretical comparison of single-pulse and double-pulse laser induced breakdown spectroscopy on metallic samples[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2008, 63(7): 805-816.

[14] [14] De Giacomo A, DeBonis A, Dell’Aglio M, et al. Laser ablation of graphite in water in a range of pressure from 1 to 146 atm using single and double pulse techniques for the production of carbon nanostructures[J]. The Journal of Physical Chemistry C, 2011, 115(12): 5123-5130.

[15] [15] De Giacomo A, Dell’Aglio M, Santagata A, et al. Cavitation dynamics of laser ablation of bulk and wire-shaped metals in water during nanoparticles production[J]. Physical Chemistry Chemical Physics, 2013, 15(9): 3083-3092.

[16] [16] Lazic V, Laserna J J, Jovicevic S. Insights in the laser-induced breakdown spectroscopy signal generation underwater using dual pulse excitation—Part I: Vapor bubble, shockwaves and plasma[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2013, 82: 42-49.

[17] [17] Lazic V, Laserna J J, Jovicevic S. Insights in the laser induced breakdown spectroscopy signal generation underwater using dual pulse excitation-Part II: Plasma emission intensity as a function of interpulse delay[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2013, 82: 50-59.

[18] [18] Xue B, Li N, Lu Y, et al. Emission enhancement of underwater collinear dual-pulse laser-induced breakdown spectroscopy with the second pulse defocused[J]. Applied Physics Letters, 2017, 110(10): 101102.

[19] [19] Tamura A, Sakka T, Fukami K, et al. Dynamics of cavitation bubbles generated by multi-pulse laser irradiation of a solid target in water[J]. Applied Physics A, 2013, 112(1): 209-213.

[20] [20] Guirado S, Fortes F J, Lasema J J. Elemental analysis of materials in an underwater archeological shipwreck using a novel remote laser-induced breakdown spectroscopy system[J]. Talanta, 2015, 137: 182-8.

[21] [21] Sakka T, Oguchi H, Masai S, et al. Use of a long-duration ns pulse for efficient emission of spectral lines from the laser ablation plume in water[J]. Applied physics letters, 2006, 88(6): 061120.

[22] [22] Sakka T, Oguchi H, Masai S, et al. Quasi nondestructive elemental analysis of solid surface in liquid by long-pulse laser ablation plume spectroscopy[J]. Chemistry Letters, 2007, 3(4): 508-509.

[23] [23] Sakka T, Masai S, Fukami K, et al. Spectral profile of atomic emission lines and effects of pulse duration on laser ablation in liquid[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2009, 64(10): 981-985.

[24] [24] Sakka T, Tamura A, Matsumoto A, et al. Effects of pulse width on nascent laser-induced bubbles for underwater laser-induced breakdown spectroscopy[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2014, 97: 94-98.

[25] [25] Tamura A, Matsumoto A, Nakajima T, et al. Effects of temporal laser profile on the emission spectra for underwater laser-induced breakdown spectroscopy: Study by short-interval double pulses with different pulse durations[J]. Journal of Applied Physics, 2015, 117(2): 640.

[26] [26] Michel A P M. Laboratory evaluation of laser-induced breakdown spectroscopy (LIBS) as a new in situ chemical sensing technique for the deep ocean[J]. Massachusetts Institute of Technology, 2007: 1-5.

[27] [27] Lawrence-Snyder M, Scaffidi J, Angel S M, et al. Laser-induced breakdown spectroscopy of high-pressure bulk aqueous solutions[J]. Applied Spectroscopy, 2006, 60(7): 786-790.

[28] [28] Michel A P M, Lawrence-Snyder M, Angel S M, et al. Laser-induced breakdown spectroscopy of bulk aqueous solutions at oceanic pressures: evaluation of key measurement parameters[J]. Applied Optics, 2007, 4(13): 2507-2515.

[29] [29] Lawrence-Snyder M, Scaffidi J, Angel S M, et al. Sequential-pulse laser-induced breakdown spectroscopy of high-pressure bulk aqueous solutions[J]. Applied Spectroscopy, 2007, 61(2): 171-176.

[30] [30] Michel A P M, Chave A D. Double pulse laser-induced breakdown spectroscopy of bulk aqueous solutions at oceanic pressures: interrelationship of gate delay, pulse energies, interpulse delay, and pressure[J]. Applied Optics, 2008, 47(31): G131-G143.

[31] [31] Lawrence-Snyder M, Scaffidi J P, Pearman W F, et al. Issues in deep ocean collinear double-pulse laser induced breakdown spectroscopy: Dependence of emission intensity and inter-pulse delay on solution pressure[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2014, 99: 172-178.

[32] [32] Thornton B, Ura T. Effects of pressure on the optical emissions observed from solids immersed in water using a single pulse laser[J]. Applied Physics Express, 2011, 4(2): 022702.

[33] [33] Thornton B, Takahashi T, Ura T, et al. Cavity formation and material ablation for single-pulse laser-ablated solids immersed in water at high pressure[J]. Applied Physics Express, 2012, 5(10): 102402.

[34] [34] Thornton B, Sakka T, Takahashi T, et al. Spectroscopic measurements of solids immersed in water at high pressure using a long-duration nanosecond laser pulse[J]. Applied Physics Express, 2013, (8): 082401.

[35] [35] Takahashi T, Thonton B, Ura T. Investigation of double-pulse laser-induced breakdown spectroscopy for analysis of the composition of solids submerged at high pressures[C]. Oceans. IEEE, 2012: 1-5.

[36] [36] Hou H, Tian Y, Li Y, et al. Study of pressure effects on laser induced plasma in bulk seawater[J]. Journal of Analytical Atomic Spectrometry, 2014, 29(1): 169-175.

[37] [37] Hou H, Li Y, Tian Y, et al. Plasma condensation effect induced by ambient pressure in laser induced breakdown spectroscopy[J]. Applied Physics Express, 2014, 7: 032402.

[38] [38] Li N, Guo J, Zhu L, et al. Effects of ambient temperature on laser-induced plasma in bulk water[J]. Applied Spectroscopy, 2019, 73(11): 1277-1283.

[39] [39] Li N, Guo J, Zhang C, et al. Salinity effects on elemental analysis in bulk water by laser-induced breakdown spectroscopy[J]. Applied Optics, 2019, 58(14): 3886-3891.

[40] [40] Guirado S, Fortes F J, Lazic V, et al. Chemical analysis of archeological materials in submarine environments using laser-induced breakdown spectroscopy. On-site trials in the Mediterranean Sea[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 2012, 74: 137-143.

[41] [41] Guirado S, Fortes F J, Laserna J J. Elemental analysis of materials in an underwater archeological shipwreck using a novel remote laser-induced breakdown spectroscopy system[J]. Talanta, 2015, 137: 182-188.

[42] [42] Thornton B, Sakka T, Takahashi T, et al. Laser-induced breakdown spectroscopy for in situ chemical analysis at sea[C]. Underwater Technology Symposium (UT), 2013 IEEE International. IEEE, 2013: 1-7.

[43] [43] Thornton B, Takahashi T, Sato T, et al. Development of a deep-sea laser-induced breakdown spectrometer for in situ multi-element chemical analysis[J]. Deep Sea Research Part I: Oceanographic Research Papers, 2015, 95: 20-36.

[44] [44] Guo J, Lu Y, Cheng K, et al. Development of a compact underwater laser-induced breakdown spectroscopy (LIBS) system and preliminary results in sea trials[J]. Applied Optics, 2017, 5(29): 8196-8200.

[45] [45] Morel A. Optical Aspects of Oceanography[M]. London: Academic Press, 1974, 1-24.

[46] [46] Russo R E, Bol’shakov A A, Mao Xianglei, et al. Laser ablation molecular isotopic spectrometry[J]. Spectrochimica Acta Part B, 2011, 66: 99-104.