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 ?
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.
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.
If only diffraction effect and the self-focusing due to the Kerr effect are considered, the theoretical analysis indicates that when the initial power exceeds the critical power, the beam width goes to zero in a finite propagation distance.
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.
OXFORD physics professor Joshua Silver has invented a pair of self-focusing glasses which could help millions of people in the developing world.
1986 "Persistent high self-focus after failure and low self-focus after success: The depressive self-focusing style.
Since videotaped feedback is by definition a self-focusing stimuli, it is predicted that:
The researchers will describe their self-focusing laser at next month's International Electronic Devices meeting in Washington, D.