Interactions of intense ultraviolet laser radiation with solid aerosols
作者:
D. E. Poulain,
D. R. Alexander,
J. P. Barton,
S. A. Schaub,
J. Zhang,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 5
页码: 2283-2288
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345522
出版商: AIP
数据来源: AIP
摘要:
Characterizations of the interaction of intense ultraviolet laser radiation (&lgr;=248 nm) with small solid aerosols are presented. Interaction dynamics, velocity measurements of expelled material, and thresholds for plasma formation are presented for aluminum, calcium fluoride, glass, silicon carbide, and tungsten particles. An excimer laser operating with a krypton fluoride gas mixture was used to irradiate small solid aerosol particles (≊5–50 &mgr;m) under atmospheric and vacuum conditions down to 10−5Torr. Focused laser radiation intensities varied from 107W/cm2to a maximum of 2×1011W/cm2. Interactions of the laser radiation with the solid aerosols were recorded in real time by an ultraviolet laser imaging system. Velocities between 250 and 2000 m/s were measured for material ejected from particles undergoing laser interaction. Laser intensity thresholds for visible plasma emission ranged from a maximum of 650 MW/cm2for aluminum to a minimum of 59 MW/cm2for tungsten. Thresholds for plasma formation were determined to be relatively independent of ambient pressure.
点击下载:
PDF
(944KB)
返 回