Applications of a new high spatial and spectral resolution spectrograph design principle to solar and stellar ultraviolet spectroscopy

Physics

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Broadband, Gratings (Spectra), High Resolution, Spectral Resolution, Spectroheliographs, Stellar Spectrophotometry, Design Analysis, Optical Scanners, Solar Spectra, Systems Engineering, Tuning

Scientific paper

Schemes for double-dispersion spectrographs and spectrometers are described which make use of two classical concave gratings in tandem. In the tandem Wadsworth mount, one grating is positioned so that the slit is on the grating normal and at the grating focus; the second grating has the same radius and ruling density and is arranged coincident with the radius of the first grating. The recorded solar spectra have high spectral resolution throughout the 1200-1700 A range. By arranging the two concave gratings so that their normals are parallel, a zero-dispersion broadband spectroheliograph can be constructed. A tunable narrow-band spectroheliograph is obtained by adding a grid collimator between the first and second grating. A variation of the symmetric tandem Wadsworth mount can be employed to construct a double-dispersion stigmatic, coma-free scanning spectrometer.

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