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 ?
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.
Unfortunately, many people descend into the pitfalls of self-focusing.
OXFORD physics professor Joshua Silver has invented a pair of self-focusing glasses which could help millions of people in the developing world.
The researchers will describe their self-focusing laser at next month's International Electronic Devices meeting in Washington, D.
In his chapter on culture, however, Weinstein talks about the "syndrome" in Faulkner's fiction, "the male lust for virginity," an "ordeal of self-focusing [that] is insistently punitive, as if for Faulkner the entry into male selfhood were inseparable from aggression against the body' (pp.
Patent number US 7269195, titled "Laser Diode With an Amplification Section That has a Varying Index of Refraction," protects a concept unique to QPC for combating the self-focusing phenomenon found in other high powered laser diodes.
According to a report in National Geographic News the new technique, which is a 21st-century form of Morse code, uses self-focusing laser beams to superheat BB-size quantities of water up to 70 feet (20 meters) beneath the waves.
There seems to be a kind of self-focusing effect that's created by armoring or reinforcing the biological material, which by itself would normally be too fragile to withstand the ion beam," Douglas says.
The high-resolution, non-invasive, self-focusing Panasonic camera quickly captures a digital photograph of each of the sex offender's eyes and creates a unique iris code for each individual enrolled in the system.