Immersed gratings and associated phenomena.

Physics – Optics

Scientific paper

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Astronomical Spectroscopy, Gratings (Spectra), Spectral Resolution, Pixels, Prisms

Scientific paper

The spectral resolution of an immersed diffraction grating is discussed. The main focus of the study is for astronomical spectroscopy, in which a substantial angular separation is generally required between the incident and diffracted collimated beams to accommodate a collimator and camera with different relative apertures. It is shown that when a grating immersed on one face of an entry prism is separated from the prism so that the light beam reaches the grating through a parallel air space, then the spectral resolution arising at the grating is unchanged. However, the position of the blaze maximum does change.

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