Get more Mail & Guardian
Subscribe or Login

Sandile Ngcobo makes light work of lasers

Sandile Ngcobo, the Council for Scientific and Industrial Research (CSIR) scientist responsible for developing the world's first digital laser, gave what is probably the shortest speech in the history of press briefings at the announcement of the breakthrough this week. He stood up in the small, swelteringly hot room at the National Laser Centre, thanked the CSIR for giving him the opportunity to undertake the research, said the discovery was exciting, and sat down again, to ­journalists' applause.

Speaking to the Mail & Guardian on Wednesday, he was equally self-effacing. Originally from Pietermaritzburg, where his parents and brothers still live, the 33-year-old Ngcobo is a full-time employee at the National Laser Centre, part of the CSIR since 2003, and works in the mathematical optics unit.

At the same time, he is a doctoral candidate at the University of KwaZulu-Natal, where he did his undergraduate and honours degrees. He took a brief hiatus from the university to do his MSc at Stellenbosch University. But he notes: "I'm a full-time employee of the CSIR. It's not like I'm just a student."

But the breakthrough – how to control the size and shape of a laser beam using a computer – forms part of his doctorate, which "is on controlling the light inside lasers", he said.

In a traditional laser, the beam is shaped inside a box with two mirrors, the curvature of the mirrors determining the size and shape of the beam. If a researcher, company or manufacturer requires a different beam, they either have to replace one of the mirrors in the laser or manipulate the beam once it comes out of the laser using a spatial light modulator. Lasers cost thousands of rands, and altering them is a lengthy and costly exercise.

Ngcobo's research has shown it is possible to alter the beam from inside the laser  by replacing one of the mirrors with a computer interface. The research was published in the journal Nature Communications last month.

The computer interface is "like a television which displays the image you're watching", said Professor Andrew Forbes, the chief scientist and research group leader in the mathematical optics group. "The basic idea is to create the desired hologram digitally," which acts as a spatial light modulator.

To build a laser, you require "a medium that can amplify light, something to excite the medium and a box made of two mirrors that bounces the light backwards and forward. We replaced one of the mirrors with our little ­television set."

Forbes said the intellectual property belonged to the CSIR, although under South African law, part of it belonged to the inventor. Igor Litvin and Liesl Burger of the mathematical optics unit were also involved in the development of the laser.

Ngcobo sounded surprisingly calm about finishing his doctorate, saying he was just going to collect the papers he had previously published. The digital laser is also the second patent he has been responsible for.

Told about the adulation he was receiving about the laser, and the fact that many were saying someone should "give the man a Bell's", he chuckled with embarrassment: "But I don't drink."

Subscribe to the M&G

Thanks for enjoying the Mail & Guardian, we’re proud of our 36 year history, throughout which we have delivered to readers the most important, unbiased stories in South Africa. Good journalism costs, though, and right from our very first edition we’ve relied on reader subscriptions to protect our independence.

Digital subscribers get access to all of our award-winning journalism, including premium features, as well as exclusive events, newsletters, webinars and the cryptic crossword. Click here to find out how to join them.

Sarah Wild
Sarah Wild is a multiaward-winning science journalist. She studied physics, electronics and English literature at Rhodes University in an effort to make herself unemployable. It didnt work and she now writes about particle physics, cosmology and everything in between.In 2012, she published her first full-length non-fiction book Searching African Skies: The Square Kilometre Array and South Africas Quest to Hear the Songs of the Stars, and in 2013 she was named the best science journalist in Africa by Siemens in their 2013 Pan-African Profiles Awards.

Related stories

WELCOME TO YOUR M&G

If you’re reading this, you clearly have great taste

If you haven’t already, you can subscribe to the Mail & Guardian for less than the cost of a cup of coffee a week, and get more great reads.

Already a subscriber? Sign in here

Advertising

Subscribers only

The basic income grant is surely on the horizon

It is becoming clear SA needs a BIG, as many ANC cabinet members, opposition parties and experts agree. But there is still dissent from some quarters

Bargaining council looks into complaint against Blade Nzimande

Two months before the long-serving higher education director general was suspended, he reported Nzimande to the bargaining council

More top stories

The basic income grant is surely on the horizon

It is becoming clear SA needs a BIG, as many ANC cabinet members, opposition parties and experts agree. But there is still dissent from some quarters

Bargaining council looks into complaint against Blade Nzimande

Two months before the long-serving higher education director general was suspended, he reported Nzimande to the bargaining council

Ace claims the state’s witness

The ANC’s suspended secretary general believes the state’s witness is, in fact, the defence’s witness

Taxi violence: Fight for survival in Cape Town’s dangerous turf...

The flare-up of the taxi war in the Western Cape has again shown the industry’s ability to hold commuters, the state and the local economy to ransom
Advertising

press releases

Loading latest Press Releases…
×