Trio win Nobel prize for laser physics

By Niklas Pollard and Ben Hirschler

STOCKHOLM/LONDON (Reuters) - A trio of American, French and Canadian scientists won the 2018 Nobel Prize for Physics on Tuesday for breakthroughs in laser technology that have turned light beams into precision tools for everything from eye surgery to micro-machining.

They include the first female physics prize winner in 55 years.

Canada's Donna Strickland, of the University of Waterloo, becomes only the third woman to win a Nobel for physics, after Marie Curie in 1903 and Maria Goeppert-Mayer in 1963.

Arthur Ashkin of Bell Laboratories in the United States won half of the 2018 prize for inventing "optical tweezers", while Strickland shared the remainder with Frenchman Gerard Mourou, who also has U.S. citizenship, for work on high-intensity lasers.

"Obviously we need to celebrate women physicists," Strickland said shortly after learning of the prize.

The Nobel prizes have long been dominated by male scientists, and none more so than physics.

Strickland is the first female Nobel laureate in any field in three years. The Royal Swedish Academy of Sciences said last year it would seek to more actively encourage nominations of women researchers to begin addressing the imbalance.

Strickland later spoke of how her predecessor, Goeppert Mayer, had been "allowed to follow her husband from job to job while he ... went up the ranks as a professor", while she was only allowed to teach or do unpaid research.

"Women have come a long way," she told a news conference in Canada.

Her win comes a day after Europe's physics research centre CERN suspended an Italian scientist, Alessandro Strumia, for telling a seminar at the organisation's Swiss headquarters last week that physics was "invented and built by men" and that women were now being favoured in hiring for research positions.

Jessica Wade, a physicist at Imperial College London who was at the CERN event and unhappy about Strumia's comments, said having a female Nobel winner was also important given the current fight over U.S. Supreme Court nominee Brett Kavanaugh, who is facing sexual misconduct allegations.

"This news could not come at a better time," Wade told Reuters. "After a week where a woman has been forced to describe her sexual assault to a live television audience of billions, and an academic at a prestigious university has said that women are unfairly promoted into senior positions in physics, even I – the eternal optimist – was starting to lose hope."

PRECISION INSTRUMENTS

The inventions by the three scientists awarded this year's Nobel Prize for Physics date back to the mid-1980s and over the years they have revolutionised laser physics.

"Advanced precision instruments are opening up unexplored areas of research and a multitude of industrial and medical applications," the academy said on awarding the nine million Swedish crown (770,594.1 pounds) prize.

Ashkin's work was based on the realisation that the pressure of a beam of light could push microscopic objects and trap them in position. A breakthrough came in 1987, when he used the new optical tweezers to grab living bacteria without harming them.

At 96, Ashkin is the oldest ever Nobel prize winner, but he is still busy with fresh research.

"I am busy working right now, writing an important paper on solar energy," he told Reuters in a telephone interview.

"I'm surprised," Ashkin said about winning the prize. "A guy called me up on the phone and woke me up."

Mourou and Strickland's research centred on developing the most intense laser pulses ever created by humans, paving the way for the precision instruments used today in corrective eye surgery and industrial applications.

The prizes for achievements in science, literature and peace have been awarded since 1901 in accordance with the will of Swedish business tycoon Alfred Nobel, whose discovery of dynamite generated a vast fortune used to fund the prize.

Physics is the second of this year's crop of prizes and comes after the medicine prize was awarded on Monday for discoveries about how to harness and manipulate the immune system to fight cancer.

However, for the first time in decades no Nobel Prize for literature will be given this year after a scandal over sexual misconduct allegations saw a string of members leave the board of the Swedish Academy that awards it.

(Additional reporting by Kate Kelland, Matt Scuffham, Brendan O'Brien, Esha Vaish, Daniel Dickson and Helena Soderpalm. Editing by Andrew Heavens and Gareth Jones)/Reuters