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5 terms
Definitions: S
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square x
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S x
square wave
A wave that changes from one amplitude to the other in a short time compared with the wavelength.
self-phase modulation
Self-phase modulation (SPM) is a nonlinear optical phenomenon that occurs when an intense laser beam passes through a medium, causing a change in the phase of the light due to its interaction with...
step tablets
In sensitometric testing, a series of areas progressing by equal density steps (usually the increments between steps are equal to the logarithm of the square root of two). They are commonly used in...
steradian
The unit solid angle subtended at the center of a sphere by an area on its surface equivalent to the square of the radius; the unit of solid angular measurement, often used in problems of...
structure function
The mean square difference in a spatial parameter at points spaced a given distance.
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