Title :
Optical field dependence of breakdown in liquids by Q-switched lasers
Author_Institution :
Dept. of Electron. Eng. & Comput. Sci., Kinki Univ., Osaka, Japan
Abstract :
Probabilistic behavior of optical breakdown in water is investigated as a function of the laser intensity using Q-switched 1.06 μm and 0.532 μm lasers with 5-6 ns duration and is compared with the breakdown probability of air in which a avalanche mechanism is believed to govern the breakdown process. These results suggest us a mechanism of optical breakdown is the following. Initial electrons are supplied from liquid itself or impurities in liquids by multiphoton absorption process. These seed electrons absorb laser radiation thorough collision with liquid molecules (microwave breakdown process) and acquires sufficient energy to induce avalanche ionization of liquid molecules.
Keywords :
Q-switching; avalanche breakdown; dielectric liquids; laser beam applications; multiphoton processes; 0.532 micron; 1.06 micron; Q-switched lasers; avalanche ionization; laser radiation; microwave breakdown; molecules breakdown; multiphoton absorption; optical breakdown; optical field dependence; seed electrons; Avalanche breakdown; Electric breakdown; Electrons; Laser theory; Liquids; Masers; Microscopy; Optical attenuators; Optical filters; Plasma waves;
Conference_Titel :
Dielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8954-9
DOI :
10.1109/ICDL.2005.1490028
