High-resolution imaging spectrometer for recording absolutely calibrated far ultraviolet spectra from laser-produced plasmas

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3000685· OSTI ID:21266445

Brown, Charles M; Seely, John F ^[1]; Feldman, Uri ^[2]; Holland, Glenn E ^[3]; Weaver, James L; Obenschain, Steven P ^[4]; Kjornrattanawanich, Benjawan ^[5]; Fielding, Drew ^[6]

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1. Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
2. ARTEP Inc., Ellicott City, Maryland 21042 (United States)
3. SFA Inc., 2200 Defense Highway, Suite 405, Crofton, Maryland 21114 (United States)
4. Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States)
5. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA and Universities Space Research Associates, Columbia, Maryland 21044 (United States)
6. Commonwealth Technologies Inc., 5775 Barclay Drive, Alexandria, Virginia 22315 (United States)

An imaging spectrometer was designed and fabricated for recording far ultraviolet spectra from laser-produced plasmas with wavelengths as short as 155 nm. The spectrometer implements a Cassegrain telescope and two gratings in a tandem Wadsworth optical configuration that provides diffraction limited resolution. Spectral images were recorded from plasmas produced by the irradiation of various target materials by intense KrF laser radiation with 248 nm wavelength. Two pairs of high-resolution gratings can be selected for the coverage of two wavebands, one grating pair with 1800 grooves/mm and covering approximately 155-175 nm and another grating pair with 1200 grooves/mm covering 230-260 nm. The latter waveband includes the 248 nm KrF laser wavelength, and the former waveband includes the wavelength of the two-plasmon decay instability at (2/3) the KrF laser wavelength (165 nm). The detection media consist of a complementary metal oxide semiconductor imager, photostimulable phosphor image plates, and a linear array of 1 mm{sup 2} square silicon photodiodes with 0.4 ns rise time. The telescope mirrors, spectrometer gratings, and 1 mm{sup 2} photodiode were calibrated using synchrotron radiation, and this enables the measurement of the absolute emission from the laser-produced plasmas with temporal, spatial, and spectral resolutions. The spectrometer is capable of measuring absolute spectral emissions at 165 nm wavelength as small as 5x10{sup -7} J/nm from a plasma source area of 0.37 mm{sup 2} and with 0.4 ns time resolution.

• OSTI ID: 21266445
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10; Other Information: DOI: 10.1063/1.3000685; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
CURIUM OXIDES
DECAY INSTABILITY
DIFFRACTION
FAR ULTRAVIOLET RADIATION
GRATINGS
IMAGES
KRYPTON FLUORIDE LASERS
LASER-PRODUCED PLASMA
PHOTODIODES
PULSE RISE TIME
SEMICONDUCTOR MATERIALS
SPECTROMETERS
SYNCHROTRON RADIATION
TIME RESOLUTION
ULTRAVIOLET SPECTRA
WAVELENGTHS