A stigmatic spectrograph composed of a toroidal mirror and a concave grating both working at grazing incidence has been built and applied to the observation of laser-produced plasmas. Spatial resolution of 20–30 µm over a region of 1-mm extension and spectral resolution of ≈1500 have been obtained with a considerable increase in speed of the spectrograph. By varying the relative positions of the optical elements, it is possible to change the wavelength of stigmatic condition in the range 10–300 Å. Examples of observations of a beryllium plasma are shown.
Stigmatic Observations of Laser-Produced Plasmas with a Grazing-Incidence Spectrograph
NICOLOSI, PIERGIORGIO;TONDELLO, GIUSEPPE
1979
Abstract
A stigmatic spectrograph composed of a toroidal mirror and a concave grating both working at grazing incidence has been built and applied to the observation of laser-produced plasmas. Spatial resolution of 20–30 µm over a region of 1-mm extension and spectral resolution of ≈1500 have been obtained with a considerable increase in speed of the spectrograph. By varying the relative positions of the optical elements, it is possible to change the wavelength of stigmatic condition in the range 10–300 Å. Examples of observations of a beryllium plasma are shown.
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