concave diffraction grating

A concave diffraction grating is a component of optical devices that uses a curved surface with precisely ruled, parallel lines to separate light into its constituent wavelengths, forming a spectrum. Unlike plane gratings, concave gratings can produce sharp spectral lines without additional lenses or mirrors, making them valuable for infrared and ultraviolet spectroscopy where lenses can absorb radiation.1

These gratings work based on the principle of diffraction and interference. When light strikes the grating, waves of specific wavelengths constructively interfere in certain directions, while others interfere destructively. This separation allows for the analysis of light, with the resolving power (R) indicating the ability to distinguish between closely spaced wavelengths ((R = \lambda / \Delta\lambda)).12