Title :
Radiation structure of laser-produced plasma at low Mach-number by 2-wavelength Mach-Zehender interferometer
Author :
Shimamura, Kohei ; Ofosu, Joseph A. ; Fukunari, Masafumi ; Komurasaki, Kimiya ; Koizumi, Hirotaka
Author_Institution :
Dept. of Adv. Energy, Univ. of Tokyo, Kashiwa, Japan
Abstract :
Understanding laser absorption and its heating structure is a key to improving the performance of myriad applications, especially laser propulsion thruster. The laser heating structure is known to ZND model in the same manner as chemical detonation. Much effort has been spent on models for Raizer´s theory. However, experimental investigation on previous models has not yet been explained completely. Recent studies show the occurrence of laser-absorption from the point ahead of the shock wave at high Mach-number. This phenomenon is explained not by shock-induced ionization but by non-hydrodynamic ionization (Photoionization induced by UV light) mechanism. Thus the propagation of laser-produced plasma is mainly induced by photoionization due to UV radiation from the plasma.
Keywords :
Mach number; Mach-Zehnder interferometers; detonation; photoionisation; plasma accelerators; plasma diagnostics; plasma heating by laser; plasma light propagation; plasma production by laser; plasma shock waves; propulsion; ultraviolet spectra; 2-wavelength Mach-Zehender interferometer; Raizer´s theory; UV light; UV radiation; ZND model; chemical detonation; high Mach-number; laser heating structure; laser propulsion thruster; laser-absorption; laser-produced plasma propagation; low Mach-number; mechanism; myriad application; nonhydrodynamic ionization; photoionization; radiation structure; shock wave; shock-induced ionization; Chemical lasers; Gas lasers; Heating; Ionization; Laser modes; Laser theory;
Conference_Titel :
Plasma Science (ICOPS), 2013 Abstracts IEEE International Conference on
Conference_Location :
San Francisco, CA
DOI :
10.1109/PLASMA.2013.6634783
