In optics, a diffraction grating is an optical grating with a periodic structure that diffracts light, or another type of electromagnetic radiation, into several beams traveling in different directions (i.e., different diffraction angles).

Light diffracts as it moves through space, bending around obstacles, interfering constructively and destructively. This can be used as a spectroscopic tool—a diffraction grating disperses light according to wavelength, for example, and is used to produce spectra—but diffraction also limits the detail we can obtain in images.

The optical properties of gratings consisting of equally spaced concentric circles or spirals are considered and their image-forming properties are described. Expressions for the light intensity distribution in the images of a point source are derived.

2022年9月1日 · Diffraction gratings, either transmissive or reflective, can separate different wavelengths of light using a repetitive structure embedded within the grating. The structure affects the amplitude and/or phase of the incident wave, causing interference in the output wave.

The fine structure of the annular images of circular gratings is analyzed in terms of diffraction patterns of axicon pairs. Each image arises substantially from only one converging and one diverging axicon of equal deflection angle.

Circular diffraction limits the minimum size do the spot that can be formed by a lens. According to ray optics. camera lens with an f- number (f/D) equal to 1.4 is used to focus light from a distant source. What is the diffraction limited radius of the spot that can be formed for 500 nm light?

A circular grating is defined, for the purposes of this paper, as consisting of a number of concentric circular rings of constant radial spacing on a transparent or reflecting surface. The rings may be alternately more and less absorbing giving an

A diffraction grating is an optical component with a regular pattern. ... A computer-generated image of an Airy disk Diffraction pattern from a circular aperture at various distances. The far-field diffraction of a plane wave incident on a circular aperture is often referred to as the Airy disk.

Diffraction gratings are commonly used for spectroscopic dispersion and analysis of light. What makes them particularly useful is the fact that they form a sharper pattern than double slits do. That is, their bright fringes are narrower and brighter while their dark regions are darker.

2003年11月15日 · A circular Dammann grating that can produce circular equal intensities at various orders in the far field is described. A set of parameters such as order, circular number, uniformity, and diffraction efficiency has been defined to …