Abstract

Laser-produced plasmas emit intense X radiation primarily at sub-KeV Photon energies. Spectra in the sub-KeV region were measured with a pinhole transmission grating and grazing incidence spectrographs respectively. The transmission grating spectrometer with two pinholes of 25 μm and 50 μm in diameter is consisted of free-standing gold bars (1000 Lines/mm, bar thickness 0.45 pm). The wavelength resolution achieved in the spectrometer was 10Å. The grazing incidence spectrograph is composed of a toroidal mirror and a concave grating. It is designed to cover the spectral range of 10~450 Å in the first difraction order. The angles of incidence on both mirror and grating are 87~87.5° in order to maintain good efficiency down to 20 Å. The spectrograph of 998.8 mm radius and 2400 grooves/mm, the brazing angle being 2°.

© 1988 Optical Society of America