self-focusing


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self-focusing

[¦self ′fō·kə·siŋ]
(optics)
The action of a medium whose index of refraction increases with increasing optical intensity on a laser beam that is more intense in the center than at the edges, whereby the profile of the refractive index corresponds to that of a positive lens, causing the beam to focus.
References in periodicals archive ?
Self-focusing task This task was also developed for the purpose of the current experiment, primarily to control for the extra 5 minutes it took to complete the specified other-focusing task.
One such relativistic phenomena - induced transparency - can produce laser self-focusing, the transmission of shorter pulses with a fast rising edge (through thin foils) and is predicted to change the laser polarisation.
In addition, self-focusing and the coupling effect are discussed.
TEHRAN (FNA)- Researchers have designed an optical lens that exhibits two properties that so far have not been demonstrated together: self-focusing and an optical effect called the Talbot effect that creates repeating patterns of light.
People who were forced to sit upright also managed to speak more words during their speeches and used less first-person singular pronouns like "me" or "I," which Broadbent said suggested more energy, less negative mood and less self-focusing.
Self-focusing of laser beams is an important nonlinear process in laser produced plasma and laser based charged particle accelerators.
The results showed that subjects with hallucinations showed significantly higher private self-awareness than the psychiatric control group, further demonstrating that those self-focusing levels predicted the appearance of hallucinations.
In fact the collapse also occurs in one-dimensional (1D) NLS equation with self-focusing quintic term [9].
For sufficiently strong field, such that [beta] > 1 / 2([w.sub.0y] / [w.sub.0x] + [w.sub.0x] / [w.sub.0y], self-focusing reduces the average width.
This can enable self-focusing light beams, highly directive antennas, and even potentially an approach to cloak or hide objects, at least in the small-scale or a narrow band of frequencies currently," he added.
Self-focusing of relativistic electron bunches in plasmas.
This pain-t-sized detector combines the self-focusing capabilities of fused silica capillaries with the high speed, high spatial resolution of Active Pixel Sensors, which are similar to those used in digital cameras or mobile phones.