A slit grating spectrograph for quantitative soft x-ray spectroscopy
نویسندگان
چکیده
In this article we describe a new slit grating spectrograph which is based on an e-beam written 10 000 linepairs/mm freestanding transmission diffraction grating. In combination with a thinned, back-illuminated charge coupled device ~CCD!, the spectrograph allows for real-time spectroscopy of laser-produced plasma x-ray sources within the wavelength region l51–20 nm. Calibration of grating and CCD allow for the possibility to measure absolute photon fluxes, currently within the wavelength region l51–6 nm. The compact spectrograph is easy to align and flexible in its use. Absolutely calibrated spectra were obtained from a liquid-jet laser-plasma source in the water window, with a spectral resolution l/Dl>330 at l53.37 nm. A simple change in experimental geometry allowed single-shot spectra to be recorded with l/Dl>60 at the same wavelength. In addition, spectra from this laser-plasma source were measured within the range l59–20 nm. © 1999 American Institute of Physics. @S0034-6748~99!02203-0#
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