Scientists win Nobel for laser work
NEWYORK (AP) >> Scientists from the United States, Canada and France won the Nobel Prize in physics Tuesday for revolutionizing the use of lasers in research, finding ways to make them deliver more powerful flashes of light and even to act like tiny tweezers.
Their work paved the way for laser eye surgery to improve vision and studies that can manipulate cells and their innards.
Two winners also made history for other reasons. Arthur Ashkin, the American who developed “optical tweezers,” became the old- est Nobel Prize laureate at age 96. And Donna Strickland, of the University of Waterloo in Canada, became only the third woman to have won the physics Nobel, and the first in 55 years.
Strickland and the third winner, Frenchman Gerard Mourou of the Ecole Polytechnique and University of Michigan, developed a way to generate high-intensity, ultra- short bursts of laser light. They share half of the 9 million kronor ($1.01 million) prize while the other half goes to Ashkin, who worked at Bell Labs in New Jersey.
Ashkin said he was pleasantly surprised when he got the 5 a.m. call from Sweden.
“I’m very old and had given up worrying about things like Nobel Prizes,” he told The Associated Press. He said he’s working on solar energy research at his New Jersey home. These days, though, scientific research is “a hobby more or less,” he told the official website of the Nobel Prize. “I tell my wife that’s the only thing I’m really good at.” The work of the three winners constitutes “fundamental breakthroughs in physics that led to tools that are now being used all over science,” said Robbert Dijkgraaf, director of the Institute for Advanced Study in Princeton, New Jersey. Sweden’s Royal Academy of Sciences said Ashkin’s development of optical tweezers that can grab tiny particles such as viruses without damaging them realized “an old dream of science fiction,” using the tiny amount of pressure exerted by beams of light to move objects. That means lasers can be used to push, pull or hold in place tiny objects like atoms, molecules and living cells. Optical tweezers “created entirely new opportunities for observing and controlling the machinery of life,” the Nobel committee said. “You see the thing work and your heart stops. The hairs stand up on the back of your neck,” said David Grier of New York Univer-
sity, who uses optical tweezers in his research.
With the ability to manipulate tiny cells like sperm and eggs, optical tweezers are used in research involving in vitro fertilization, Grier said. They can also be used to grab and stretch cells, and so distinguish between normal and cancerous cells, he said.
On an even smaller scale, they can be used to study how proteins interact with other molecules in the body, to unfold individual proteins and to study traits like how much torque they exert while rotating. And they can help give insights into how disease causes trouble by interfering with proteins that haul molecular cargo within a cell, said Arne Gennerich of the Albert Einstein College of Medicine in the Bronx.
Working together, Strickland and Mourou helped develop a way to produce very brief and intense laser pulses that have broad industrial andmedical applications, including laser eye surgery and highly precise machine cutting. The academy said their 1985 article on the technique
was “revolutionary.”
“With the technique we have developed, laser power has been increased about a
million times, maybe even a billion,” Mourou said in a video statement released by Ecole Polytechnique.
Strickland’s award was the first Nobel Prize in physics to go to a woman since 1963, when it was won
by Maria Goeppert-Mayer; the only other woman to win for physics was Marie Curie in 1903.