Blaze characteristics of echelle gratings
Applied Optics (Impact Factor: 1.78). 12/1982; 21(23):4356-62. DOI: 10.1364/AO.21.004356
A new model for the blaze function of the two in-plane mountings of echelle gratings is described and extended to account for defects in the edges of the grooves. Expressions for the relative efficiency are given. The model shows that the wavelength for the maximum blaze intensity differs slightly from the wavelength lambda(0) satisfying mlambda(0) = d[sinalpha + sin(2theta - alpha)], the difference being a function of the spectral order. The off-blaze orders of the wavelengths diffracted at the central blaze for the mounting alpha < theta (alpha = angle of incidence, theta = blaze angle) lie at the minima of the blaze function for a perfect echelle. Results are given from measurements of the blaze angle and the groove edge defects of three echelles.
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ABSTRACT: This paper describes a new spectrometer mounting using several echelle gratings as dispersive elements. These gratings are mounted so that a resolution equal to the sum of the resolution of the individual gratings is obtained. In the mounting the dispersions from the gratings coact resulting in very high dispersion in the focal plane. The multiechelle grating mounting can be used to build compact spectrometers with higher resolutions than can be obtained with the widest gratings ever ruled. Results from an experimental verification of the multiechelle grating mounting are given.
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