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Diffraction grating

This is a simulation of a what light does when it encounters a diffraction grating. Use at least one of the checkboxes to turn on a beam of light. When the light encounters the diffraction grating (a comb-like structure with a large number of equally spaced openings), the light is diffracted, because of constructive interference, at particular angles. Compared to a double-slit, the lines produced by the diffraction grating are very sharp (narrow) and bright.

A close-up of the center of the grating can be seen at the bottom right. You can use the slider to control the grating spacing, which is the distance between neighboring openings in the grating.

In the simulation, red light has a wavelength of 650 nm, green light has a wavelength of 550 nm, and blue light has a wavelength of 450 nm.

Simulation written by Andrew Duffy, and first posted on 8-17-2017.

This work by Andrew Duffy is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
This simulation can be found in the collection at http://physics.bu.edu/~duffy/classroom.html.
The counter has been running on this page since 8-14-2018. The number of people accessing the page since then is:

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Choose between experiment and results to view either from the menu.
When results are displayed, dragging below the graph area shows the alignment of individual phasors (white) and the resultant phasor (yellow).
The intensity in the sidebands is exaggerated to make them visible.
You can increase, decrease the scale on the y axis by clicking/touching in the right/left halves of the graph area.

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Choose between experiment and results to view either from the menu. When results are displayed, dragging below the graph area shows the alignment of individual phasors (white) and the resultant phasor (yellow). The intensity in the sidebands is exaggerated to make them visible.

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Physlet Physics by Christian and Belloni: Illustration 38.1

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The Marina (Single slit diffraction, Two slit interference) | Physics | Interactive Simulation | CK-12 Exploration Series

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Learn about the interference and diffraction patterns that result when a wave passes through one or two thin openings using our interactive simulation.

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First dark fringe in a single-slit diffraction pattern

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First dark fringe in a single-slit diffraction pattern

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HTML5 app: Diffraction of light by a single slit

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Description
This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen. Use the sliders to change the distance from the grating to the screen, the number of lines per millimeter in the diffraction grating, and the wavelength of the laser. Use the diagram of the screen in the top window to analyze the numerical positions of the dots on the screen using diffraction equations.

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Description This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen.

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Description
This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen. Use the sliders to change the distance from the grating to the screen, the number of lines per millimeter in the diffraction grating, and the wavelength of the laser. Use the diagram of the screen in the top window to analyze the numerical positions of the dots on the screen using diffraction equations.

# data[].attributes.attachment_link.description
Description This is a simulation of a typical laser diffraction lab set up. Examine the set up in the 3D window, it shows a laser, a diffraction grating, and a screen. Use the checkbox to place the grating in front of the laser, and look at the pattern of dots that appear on the screen.

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Differaction pattern - with white light 

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Differaction pattern - with white light 