Concave diffraction gratings combine dispersion and imaging properties onto a single optical component for integration into spectroscopic systems. These concave gratings are produced holographically, optimizing the focal plane and minimizing aberrations across the grating wavelength range. concave diffraction gratings are designed to increase grating efficiency and minimize stray light, thereby increasing spectral resolution and the signal-to-noise ratio of the spectrometer.

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When both the focusing condition and Rowland circle mounting condition are satisfied for Rowland circle concave holographic gratings, the operating and recording parameters of the grating can be determined to eliminate astigmatism, coma and certain spherical aberrations at the target wavelength. Rowland circle concave holographic gratings are generally adopted for the fabrication of Rowland circle spectrographs.

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