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Nobel Prize in Physics 2018


What is the work that has won a Nobel?

Before Dr Strickland and Dr Mourou's pioneering work, the peak power of laser pulses was limited because, when cranked up to high intensities, they would destroy the material used for amplifying its energy.

To get round this, the researchers first stretched the laser pulses in time to reduce their peak power, then amplified them and finally compressed them.

When a laser pulse is compressed in time and becomes shorter, more light is packed into a small space. This dramatically increases the intensity of the pulse.

Dr Strickland and Dr Mourou's technique, called chirped pulse amplification (CPA), became standard for high intensity lasers.

Arthur Ashkin realised an old dream in science fiction - using the radiation pressure of light to move physical objects. In doing so, he invented the optical tweezers that are today used to grab particles, atoms, viruses and living cells with their laser-based pincers.

He first worked on getting laser light to push small particles towards the centre of the beam and hold them there.

Then, in 1987, he used the tweezers to capture living bacteria without harming them. The technique is now used widely to study the machinery of life


The last woman to win the physics prize, German-born American physicist Maria Goeppert-Mayer, took the award for her discoveries about the nuclei of atoms.

Polish-born physicist Marie Curie shared the 1903 award with her husband Pierre Curie and Antoine Henri Becquerel for their research into radioactivity.

The award is worth a total of nine million Swedish kronor (£770,686; $998,618).

Reacting to her win, Dr Strickland, who is based at the University of Waterloo in Canada, said: "First of all you have to think it's crazy, so that was my first thought. And you do always wonder if it's real.

"As far as sharing it with Gerard, of course he was my supervisor and mentor and he has taken CPA to great heights so he definitely deserves this award. And I'm so happy Art Ashkin also won."

She added: "I think that he made so many discoveries early on that other people have done great things with that it's fantastic that he is finally recognised."

In a statement, the American Institute of Physics (AIP) offered its congratulations to all the winners, adding: "The countless applications made possible by their work, like laser eye surgery, high-power pettawat lasers, and the ability to trap and study individual viruses and bacteria, only promise to increase going forward.

"It is also a personal delight to see Dr Strickland break the 55-year hiatus since a woman has been awarded the Nobel Prize in Physics, making this year's award all the more historic."

BBC News 2nd October 2018