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The PhD project that won Donna Strickland her Nobel Prize

Strickland helped realize a novel mechanism through which ultrashort and intense laser pulses could be emitted safely.

Karthik Vinod

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Jijin Strickland
Credit: Jijin / EdPublica

It was in the wee hours of October 2nd, 2018, when Donna Strickland received a call from Sweden saying she was declared one of the awardees of that year’s Nobel Prize in Physics. With that she would make history, being just the third woman since Marie Curie and Maria Goeppert Mayer, to win the Nobel Prize in Physics.

Like many Nobel laureates before and even after her, it did take a moment or two for Strickland to digest the news. However, she couldn’t have felt more surprised when she realized that it wasn’t any of her research in laser physics she’d prided on being an expert on that won her the prize. Instead, she was awarded for her PhD work all the way back in the 1980s, squishing laser pulses to generate powerful beams. 

Her work came at a time in the 1980s when laser physicists faced difficulty increasing laser power beyond a threshold, when it could damage its casing and the apparatus.

By 1985, Strickland helped materialize a work-around solution proposed by her then PhD supervisor, Gérard Mourou. They had laser light pass through a prism, splitting them to produce a rainbow-like distribution of individually low power light beams. These would then be passed through a power amplifier, before being forcibly recombined into an extremely intense laser pulse. For this work developing the mechanism called, ‘chirped pulse amplification’ (CPA), Strickland and Mourou were each awarded one-quarter of the Nobel Prize. The other half was awarded to Arthur Ashkin, for his work developing tiny particle traps using optical laser beams. 

Wikimedia lasers

A laboratory set up consisting of lasers passing through lenses and mirrors. These are continuous wave lasers, as opposed to pulsed lasers. Credit: Wikimedia

Their work removed the roadblock to building lasers with shorter pulses that were below femtoseconds (a billion times shorter than a microsecond) and ever higher power beyond pettawatts (thousands of billions of times powerful than a kilowatt source). Frontier research today uses these pulsed lasers to cut through metals, in experimental nuclear reactors to trigger fusion in pellets of hydrogen. But their usage extends well beyond the confines of the laboratory too. For example, LASIK surgery to correct eye power became a reality after intense ultraviolet pulsed lasers were shown to reshape the eye’s cornea. They’re a basic concept behind military applications such as directed-energy weapons.

Wikimedia pulsed laser

Pulse waveforms of a 2.5 nanosecond pulse duration (much bigger than the lasers Strickland and Mourou worked on, that clocked in picoseconds – a thousandth of a nanosecond). Credit: Wikimedia / NIST

In the wake of CPA’s invention, Strickland and Morou moved onto researching different problems within laser physics, and led diverged career paths. However, Strickland, for one, had rather a very slow progression up the ranks. In fact, when the Royal Swedish Academy announced the 2018 physics laureates, Strickland wasn’t even a full professor at the University of Waterloo, Canada. Worse still, her recognition was stalled outside of academia until a Wikipedia page had to be propped after the Nobel Prize was announced. 

This became a hot topic after Strickland’s win since it ruffled the feathers of scientists, particularly women commentators at one point, who saw in Strickland, a potential to be an influential role model for girls and women in STEM. For she was just the third physics laureate at the time, after Marie Curie and Maria Goeppert Mayer, and the first in a very long time after Mayer was awarded in 1963. 

It turned out Strickland didn’t really apply to be promoted, and only did so following her Nobel Prize upon being beckoned by her well-wishers. Waterloo fast-tracked their final decision to promote her in just three weeks, which in any other scenario would have been an intense and long-drawn process altogether. 

But the lack of sufficient academic recognition did color views on her and her work in public. As it later turned out, Wikipedia editors denied a page in her name, deeming her three decade research into laser physics as insignificant. 

In fact, Strickland herself recalled being stunned that she was being awarded for her contribution decades ago.  “This work was done over thirty years ago so it’s not something that I am living and breathing every day … No one is expecting, in my position, to win a Nobel Prize,” she said. 

It’s unknown why exactly there has been a three decade long wait for laser physics to be awarded any Nobel Prize at all. Delaying consensus within the Nobel committee for the award can mean researchers may not even live to be awarded. The Nobel Prize doesn’t award posthumous awards. Arthur Ashkin, the third 2018 physics Nobel laureate, was already 96 years old and a retired emeritus professor. He passed away in 2020. However, understanding how the Nobel committee made the decisions that they did will have to wait another 44 years. when the nomination lists for the 2018 prize will be publicly released. 

For Strickland, life can’t have been more different after winning the prize. To girls and women, she was a rockstar in science, being the first woman to win a physics Nobel in a long time. However, she knows how much it means to them what being a scientist is like in her younger days. 

During her school days, Strickland stood out to gain both positive and negative attention. Positive, because she aced physics modules. But negative, in that, she was studying physics which was seen traditionally as a boys’ subject, and was questioned for her choices. Although her contribution to CPA wasn’t publicly acknowledged as much as it ever did only after three decades, Strickland did find some admirers soon after her work on CPA was published in 1985.

“I would like to acknowledge my homeroom teacher, Jim Forsyth, who was also my physics teacher in Grade 13,” Strickland said, as quoted in the 2018 Nobel biography. “When I returned to Canada as a faculty member at the University of Waterloo, he read that I had developed chirped pulse amplification. He contacted me through my mother asking if I would be willing to be placed on [her school’s] wall of fame. I wasn’t sure that I belonged on this wall that included John McCrae (a famous Canadian poet). Jim said that he wanted to have a female scientist on the wall as a role model for the female students. I agreed to his request and he made it happen. I have been on [her school’s] wall of fame for two decades for the development of CPA. They recently have rewritten the citation to say that I have received the Nobel Prize for CPA. Now it doesn’t seem so strange for me to be on [her school’s] wall of fame.”

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‘You’re admired, because no one understands you’

How does a soft-spoken, late-blooming, introspective young man—once dismissed as lazy and unimaginative—go on to become one of the greatest scientific minds the world has ever known? That story, woven with personal struggles, quiet determination, and an unmatched brilliance, is one of the most inspiring in the history of science. This edition of EP Know the Scientist turns the spotlight on the legend of Albert Einstein

Joe Jacob

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A Meeting of Geniuses

In 1931, two of the most brilliant minds of the 20th century met in Hollywood. One was Albert Einstein, the theoretical physicist who had turned our understanding of the universe on its head; the other, Charlie Chaplin, a master of silent cinema who could move the world to laughter without uttering a word.

“You’re admired because everyone understands you,” Einstein said to Chaplin.

“You’re admired,” Chaplin replied, “because no one understands you.”

That exchange perfectly captured the enigma of Einstein. Though his theories baffled the masses, his influence on science, and on the world itself, was impossible to ignore.

The Face of Modern Physics

Albert Einstein’s contributions to science redefined physics. From his Special and General Theories of Relativity to his explanation of the photoelectric effect, he reshaped how we understand energy, gravity, light, and time. His famous equation, E = mc², may be the most recognized scientific formula in history—a symbol of human curiosity and intellectual might.

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Albert Einstein and Charlie Chaplin

Even today, astronomers rely on Einstein’s insights to decode gravitational waves, explain the bending of light around stars, and predict the paths of planets like Mercury. Long after his passing, Einstein continues to be a guiding force in scientific exploration.

A Curious Child

Born in 1879 in Ulm, Germany, to a middle-class Jewish family, Einstein was a quiet child. His parents worried because he spoke late. Teachers misunderstood his dreamy nature. But from a young age, Einstein was captivated by the invisible forces of the world. A simple compass given to him at age five stirred a lifelong fascination with unseen energies.

By 12, a book on Euclidean geometry filled him with awe. He called it his “sacred little geometry book,” and it gave him a glimpse of the order behind nature’s complexity.

Despite a popular myth, Einstein was not bad at math. He excelled in mathematics and physics, though he struggled with the rigid, memorization-heavy Prussian education system. Creative thinking had little space in such classrooms—and Einstein needed space to think.

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Failing to Fit, and Finding a Path

At 16, Einstein dropped out of school. He failed the entrance exam to Zurich’s prestigious Polytechnic School on his first try, performing well only in science and math. Undeterred, he studied on his own and passed the exam the following year.

After graduating in 1901, Einstein struggled to find work as a teacher. Eventually, he secured a job as a clerk at the Swiss Patent Office in Bern—a humble position that gave him time to think, scribble equations, and dream about the cosmos. It was during this period that Einstein’s revolutionary ideas took shape.

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Image: Pixabay

The Miracle Year

In 1905, while still a patent clerk, Einstein published four papers that would change the course of physics. He explained the photoelectric effect (which would win him the Nobel Prize in 1921), developed the Special Theory of Relativity, and introduced the idea of mass-energy equivalence. These ideas challenged Newtonian physics and formed the foundation of modern science.

At first, his work went unnoticed. But Max Planck, one of the leading physicists of the time, recognized Einstein’s genius. The world soon followed.

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Max Planck/ Source: Wikipedia

Fame, Flight, and Fear

By the 1910s, Einstein’s fame had spread far beyond academic circles. He was offered positions at the most prestigious universities across Europe. In 1915, he completed his General Theory of Relativity—a breathtaking explanation of gravity as the curvature of space-time.

But in 1933, as Hitler rose to power, Einstein fled Germany for the United States, renouncing his citizenship. The man dubbed the “Pope of Physics” took refuge in Princeton, New Jersey, where he would live and work for the rest of his life.

The Atom Bomb and Moral Dilemmas

Einstein’s equation E = mc² implied that immense energy could be released by splitting atoms. Though he was a lifelong pacifist, in 1939, fearing Nazi Germany’s nuclear ambitions, Einstein co-signed a letter to U.S. President Franklin D. Roosevelt urging research into atomic weapons.

Ironically, he was never part of the Manhattan Project. After World War II, horrified by the bomb’s use in Hiroshima and Nagasaki, Einstein became a leading voice against nuclear weapons.

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The Man Behind the Mind

Einstein was more than a physicist. He was a violinist, a humanist, and an outspoken critic of nationalism and racism. Though famously disheveled, his mind was razor-sharp. In 1952, he was even offered the presidency of Israel—a role he declined, saying he lacked the experience and temperament for politics.

His personal life was complex. He married twice, had children, and endured heartbreaks, illnesses, and separations. Yet his work remained a constant force—until the very end.

The Brain that Fascinated the World

When Einstein died on April 18, 1955, at the age of 76, he refused life-prolonging surgery. “I want to go when I want,” he said. But the fascination with his mind didn’t end there. The doctor who performed his autopsy, Thomas Harvey, removed Einstein’s brain—without permission. He sliced it into hundreds of pieces, preserving them for study.

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Later analyses suggested Einstein’s brain had unusual features—more folds, a larger inferior parietal lobe, and a higher ratio of glial cells. Some researchers believe these might explain his extraordinary cognitive abilities. But others warn against drawing conclusions from a brain no longer alive.

Regardless, Einstein’s mind remains a symbol of limitless human potential.

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Image: Pixabay

Legacy Eternal

Sixty-six years after his death, fragments of Einstein’s brain are still preserved in museums around the world. But his true legacy isn’t in physical remains—it’s in every scientific equation that bears his fingerprints, every telescope that bends light to measure distant stars, every classroom where young minds imagine the unimaginable.

In a world hungry for quick answers, Einstein stood for slow, deep thinking. “Imagination is more important than knowledge,” he once said. He gave us the tools to measure time and space—and the courage to wonder what lies beyond both.

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Remembering S.N. Bose, the underrated maestro in quantum physics

Rejected in Britain, celebrated by Einstein, here’s the story of S.N. Bose, the Indian physicist who formulated quantum statistics, now a bedrock theory in condensed matter physics.

Karthik Vinod

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SN Bose image credit: Wikimedia Commons. Illustration/EP

It’s 1924, and Satyendra Nath Bose, going by S.N. Bose was a young physicist teaching in Dhaka, then British India. Grappled by an epiphany, he was desperate to have his solution, fixing a logical inconsistency in Planck’s radiation law, get published. He had his eyes on the British Philosophical Magazine, since word could spread to the leading physicists of the time, most if not all in Europe. But the paper was rejected without any explanations offered. 

But he wasn’t going to give up just yet. Unrelenting, he sent another sealed envelope with his draft and this time a cover letter again, to Europe. One can imagine months later, Bose breathing out a sigh of relief when he finally got a positive response – from none other than the great man of physics himself – Albert Einstein. 

In some ways, Bose and Einstein were similar. Both had no PhDs when they wrote their treatises that brought them into limelight. And Einstein introduced E=mc2 derived from special relativity with little fanfare, so did Bose who didn’t secure a publisher with his groundbreaking work that invented quantum statistics. He produced a novel derivation of the Planck radiation law, from the first principles of quantum theory. 

This was a well-known problem that had plagued physicists since Max Planck, the father of quantum physics himself. Einstein himself had struggled time and again, to only have never resolved the problem. But Bose did, and too nonchalantly with a simple derivation from first principles grounded in quantum theory. For those who know some quantum theory, I’m referring to Bose’s profound recognition that the Maxwell-Boltzmann distribution that holds true for ideal gasses, fails for quantum particles. A technical treatment of the problem would reveal that photons, that are particles of light with the same energy and polarization, are indistinguishable from each other, as a result of the Pauli exclusion principle and Heisenberg’s uncertainty principle. 

Fascinated and moved by what he read, Einstein was magnanimous enough to have Bose’s paper translated in German and published in the journal, Zeitschrift für Physik in Germany the same year. It would be the beginning of a brief, but productive professional collaboration between the two theoretical physicists, that would just open the doors to the quantum world much wider. Fascinatingly, last July marked the 100 years since Einstein submitted Bose’s paper, “Planck’s law and the quantum hypothesis” on his behalf to Zeitschrift fur Physik. 

With the benefit of hindsight, Bose’s work was really nothing short of revolutionary for its time. However, a Nobel Committee member, the Swedish Oskar Klein – and theoretical physicist of repute – deemed it a mere advance in applied sciences, rather than a major conceptual advance. With hindsight again, it’s a known fact that Nobel Prizes are handed in for quantum jumps in technical advancements more than ever before. In fact, the 2001 Nobel Prize in Physics went to Carl Wieman, Eric Allin Cornell, and Wolfgang Ketterle for synthesizing the Bose-Einstein condensate, a prediction made actually by Einstein based on Bose’s new statistics. These condensates are created when atoms are cooled to near absolute zero temperature, thus attaining the quantum ground state. Atoms at this state possess some residual energy, or zero-point energy, marking a macroscopic phase transition much like a fourth state of matter in its own right. 

Such were the changing times that Bose’s work received much attention gradually. To Bose himself, he was fine without a Nobel, saying, “I have got all the recognition I deserve”. A modest character and gentleman, he resonates a lot with the mental image of a scientist who’s a servant to the scientific discipline itself.

BOSE INSIDE

But what’s more upsetting is that, Bose is still a bit of a stranger in India, where he was born and lived. He studied physics at the Presidency College, Calcutta under the tutelage that saw other great Indian physicists, including Jagdish Chandra Bose and Meghnad Saha. He was awarded the Padma Vibhushan, the highest civilian award by the Government of India in 1954. Institutes have been named in his honour, but despite this, his reputation has little if no mention at all in public discourse. 

To his physicists’ peers in his generation and beyond, he was recognized in scientific lexicology. Paul Dirac, the British physicist coined the name ‘bosons’ in Bose’s honor (‘bose-on’). These refer to quantum particles including photons and others with integer quantum spins, a formulation that arose only because of Bose’s invention of quantum statistics. In fact, the media popular, ‘god particle’, the Higgs boson, carries a bit of Bose as much as it does of Peter Higgs who shared the 2013 Nobel Prize in Physics with Francois Euglert for producing the hypothesis. 

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Narlikar – the rare Indian scientist who penned short stories

Jayant Narlikar has been one of the most prolific scientists, and science communicators India has ever produced. The octogenarian had died at his residence in Pune.

Karthik Vinod

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Jayant Narlikar | Photo Courtesy: Wikimedia

Jayant Narlikar passed away at his Pune residence on Tuesday. He was 86-years old, and had been diagnosed with cancer. With his demise, India lost a prolific scientist, writer, and institution builder.

In 2004, the government of India had honored Narlikar with the Padma Vibhushan, the second-highest civilian award, for his services to science and society. But that was not his first recognition from the Indian government. At the age of 26, he had received his first Padma Bhushan, in recognition for his work in cosmology, studying the universe’s large-scale structures. He helped contribute to derive Einstein’s field equations of gravity from a more general theory. That work, dubbed the Narlikar-Hoyle theory of gravity, was borne out a collaboration with Narlikar’s doctoral degree supervisor at Cambridge; Fred Hoyle, the then leading astrophysicist of his time.

Narlikar and the steady-state theory

Narlikar and Hoyle bonded over a shared skepticism towards the prevalent Big Bang hypothesis, which sought to extrapolate the universe’s ongoing expansion to its birth at some finite time in the past. However, Narlikar and Hoyle could not have been more opposed, mostly out of their own philosophical beliefs. They drew upon the works of 19th century Austrian physicist and philosopher, Ernest Mach, in rejecting a theory discussing the universe’s beginning in the absence of a reference frame. As such, Narlikar was a strong proponent of Hoyle’s steady-state model of the universe, in which the universe is infinite in extent, and indefinitely old. As such, the steady-state theorists explained away the universe’s expansion to matter being spawned into existence from this vacuum at every instant, aka a C-field.

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In the Big Bang hypothesis, an expanding universe causes matter to dilute over time. Whereas in steady-state theory, spawning matter from thin vacuum ensures that the density remains unchanged over time. Credit: Wikimedia

However, the steady-state’s predictions did not hold up in face of evidence the universe expands over time. Nor did its successive avatar, the quasi-steady state theory devised sway scientific consensus. The death knell came when evidence of the cosmic microwave background (aka the CMB) was discovered in 1964.

Despite steady-state’s failure, it provided healthy rivalry to the Big Bang from the 1940s to the 60s, providing opportunities for astronomers to compare observations to precise predictions. In the words of the Nobel laureate Steven Weinberg, “In a sense, this disagreement is a credit to the model; alone among all cosmologies, the steady state model makes such definite predictions that it can be disproved even with the limited observational evidence at our disposal.”

The Kalinga winning short-story writer

Narlikar was more than just a cosmologist, studying the large-scale structure of the universe. He also had been an acclaimed science fiction writer, with his works penned in English, Hindi, and in his vernacular, Marathi. His famous work was a short-story, Dhoomekethu (The Comet), revolving around themes of superstition, faith, rational and scientific thinking. Published in Marathi in 1976, with translations available in Hindi, the story was adapted later into a two-hour film bearing the same name. In 1985, the film aired on the state-owned television broadcasting channels, Doordarshan.

In a way, he was India’s Carl Sagan, airing episodes explaining astronomical concepts, with children being his target audience. The seventeen-episode show, Brahmand (The Universe), aired in 1994, to popular acclaim. One of his most popular books, Akashashi Jadle Nathe (Sky-Rooted Relationship), remains popular. An e-book version in Hindi is available on Goodreads, with 470 reviewers lending an average rating of 4.7 out of 5.

His efforts was honored with an international prize. In 1996, he received the much-coveted Kalinga Prize for the Popularization of Science, awarded annually in India by the United Nations Educational, Scientific and Cultural Organization (UNESCO), “in recognition of his efforts to popularize science through print and electronic media.” Narlikar had been only the second Indian at the time, after the popular science writer Jagjit Singh, to have received the award.

When Narlikar returned to India, accepting a position at the Tata Institute of Fundamental Research (TIFR), he realized that the fruits of astrophysical research did not flourish outside central institutions. Though Bengaluru had an Indian Institute of Astrophysics, Narlikar envisioned basing a research culture paralleling his time at Cambridge. Hence, the Inter-University Centre for Astronomy and Astrophysics (IUCAA) was born in 1988, and Narlikar was appointed its founding director. Arguably, his most visible legacy would have been to shape India’s astrophysical research culture through his work with the IUCAA (pronounced “eye-you-ka”).

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