Excitation wavelength dependence of water-window line emissions from boron-nitride laser-produced plasmas

Journal Article · Wed Feb 01 04:00:00 EST 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3682087· OSTI ID:22036806

Crank, M; Harilal, S S; Hassan, S M; Hassanein, A ^[1]

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1. Center for Materials Under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

We investigated the effects of laser excitation wavelength on water-window emission lines of laser-produced boron-nitride plasmas. Plasmas are produced by focusing 1064 nm and harmonically generated 532 and 266 nm radiation from a Nd:YAG laser on BN target in vacuum. Soft x-ray emission lines in the water-window region are recorded using a grazing-incidence spectrograph. Filtered photodiodes are used to obtain complementary data for water-window emission intensity and angular dependence. Spectral emission intensity changes in nitrogen Ly-{alpha} and He-{alpha} are used to show how laser wavelength affects emission. Our results show that the relative intensity of spectral lines is laser wavelength dependent, with the ratio of Ly-{alpha} to He-{alpha} emission intensity decreasing as laser wavelength is shortened. Filtered photodiode measurements of angular dependence showed that 266 and 532 nm laser wavelengths produce uniform emission.

• OSTI ID: 22036806
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 111; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANGULAR DISTRIBUTION
BORON NITRIDES
EMISSION SPECTRA
EXCITATION
FREQUENCY DEPENDENCE
LASER TARGETS
LASER-PRODUCED PLASMA
LIGHT TRANSMISSION
NEODYMIUM LASERS
PHOTODIODES
PLASMA DIAGNOSTICS
SEMICONDUCTOR MATERIALS
SOFT X RADIATION
THERMIONIC DIODES
WAVELENGTHS