Self Diffraction

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Self-diffraction in the semilinear generator geometry is investigated using statistical approach. A dynamical hologram is formed in the process of the four wave mixing of the signal image which undergoes self-diffraction and the reference image with their fannings on the background of the previous expositions with different signal images and reference beams. Phonon scattering. Scatter electrons to 5 - 15 mrad – Diffuse background in diffraction pattern – Energy loss I Convince your self! Neutron scattering is a severely underused technique for studies of catalysts. How & why neutrons are useful to catalysis - includes Neutron diffraction.

Смотри собственное излучение.

Энциклопедический словарь по металлургии. — М.: Интермет Инжиниринг. Главный редактор Н.П. Лякишев. 2000.

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If an image is made through a small aperture, there is a point at which the resolution of the image is limited by the aperture diffraction. As a matter of general practice in photographic optics, the use of a smaller aperture (larger f-number) will give greater depth of field and a generally sharper image. But if the aperture is made too small, the effects of the diffraction will be large enough to begin to reduce that sharpness, and you have reached the point of diffraction-limited imaging.

If you are imaging two points of light, then the smallest separation at which you could discern that there are two could reasonably be used as the limit of resolution of the imaging process. Presuming that diffraction is the determining factor, then the generally accepted criterion for the minimum resolvable detail is the Rayleigh criterion.

Self Diffraction Frog

This shows the intensity curves for the radial distribution of the diffracted light for different separations. Your eye sees the characteristic bullseye distribution of light as illustrated below.

Self-diffraction Autocorrelator

While perfect imaging of the source would be smaller perfect circles of light, this shows the smearing of the light by diffraction into the bullseye patterns.

Self diffraction theory

For modern digital photography where the images are projected onto a CCD, the information is collected on pixels of the digital detector. At left is an attempt to show the effect of diffraction on such imaging in cases where the diffraction is the phenomenon that limits the resolution. If the image is in focus and free of visible affects of lens aberrations, then it may be that it will fit on one pixel. But if the aperture is small enough, then diffraction can spread the image onto neighboring pixels and constitute the limit on the resolution of the image.

Self-diffraction Grating


Self Diffraction Definition

The Cambridge in Colour site has calculations and demonstrations of diffraction spreading at different f-numbers.