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References in periodicals archive ?
Among the signatories were Professor Gerard Mourou, a physics Nobel Prizewinner for the invention of 'chirped pulse amplification' a technique used to create ultrashort-pulse, very high-intensity petawatt laser pulses; Professor Stefan Hell, who developed a method in which one light pulse causes fluorescent molecules to glow, while another causes all molecules except those in a very narrow area to become dark; and Professor Theodor Hansch, whose work on the 'optical frequency comb' technique won him, along with John L Hall and Roy J Glauber, a joint-Nobel Prize.
One of the biggest advantages is that ultrashort-pulse lasers deliver a very precise concentration of light over such short duration that no heat damage occurs to the surrounding material--a process called athermal laser ablation.
Fast ignition uses the same hardware as the hot spot approach but adds a high-intensity, ultrashort-pulse laser as the "spark" that achieves ignition.
As the material requirements shifted to more Nitinol (nickel-titanium) and cobalt-chrome alloys, the industry sought even better edge characteristics, and the first use of green (0.5 micron, or 532 nm wavelength) and ultrashort-pulse (less than 200 picoseconds) laser sources were created in this market segment.
They cover semiconductor quantum dots for ultrafast optoelectronics, foundations of quantum dot theory, quantum dots in amplifiers of ultra-short pulses, quantum dot saturable absorbers, monolithic quantum dot mode-locked lasers, ultrashort-pulse solid-state lasers based on quantum dot saturable absorbers, saturable absorbers based on glasses doped with quantum dots, and emerging applications such as optical communications and biophotonics and medicine.
The new lasers became variously known as ultrashort-pulse lasers, ultrafast lasers, or simply as femtosecond lasers.
Mike Perry, who led Livermore's petawatt effort as associate program leader for short-pulse lasers, pointed out that a primary spinoff from the petawatt laser program was the development of ultrashort-pulse lasers for high-precision laser cutting and machining.
Scientists at the Laser Physics Research Center of ITMO University in Saint Petersburg, Russia, have developed a high-power, ultrashort-pulse laser that can be used in a lunar laser locator to measure the distance to the Moon accurately, to within a few millimetres.