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

AI Article Synopsis

  • A new imaging spectrometer was designed to capture far ultraviolet spectra from laser-produced plasmas, specifically targeting wavelengths as short as 155 nm using a Cassegrain telescope and tandem Wadsworth optical configuration for high resolution.
  • The spectrometer utilizes two pairs of high-resolution gratings for different wavebands, one covering 155-175 nm and another 230-260 nm, allowing it to analyze emissions related to specific laser wavelengths, such as the 248 nm KrF laser.
  • Detection is achieved using various advanced media, including a metal oxide semiconductor imager and silicon photodiodes, enabling precise measurements of spectral emissions with a spatial and temporal resolution of 0.4 ns, capable of detecting emissions as low as

Article Abstract

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 23 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(2) square silicon photodiodes with 0.4 ns rise time. The telescope mirrors, spectrometer gratings, and 1 mm(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(-7) J/nm from a plasma source area of 0.37 mm(2) and with 0.4 ns time resolution.

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Source
http://dx.doi.org/10.1063/1.3000685DOI Listing

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