Tag Archives: lasers

No more twinkle, junk and stars, now we know just where you are

Technology that ‘de-twinkles’ stars is being used to pinpoint manmade space junk and avoid devastating collisions like those dramatised in the movie Gravity.

Artist’s impression of the Giant Magellan Telescope with the laser guide beams of its adaptive optics system. Credit: GMTO Corporation

Australian company Electro Optic Systems, based on Mount Stromlo in Canberra, is using adaptive optics and pulsing lasers to locate detritus too small for conventional radar. Ultimately, the company hopes to use similar lasers to remove the debris from orbit.

Adaptive optics helps the pulsing lasers to cut through the Earth’s atmospheric turbulence, which distorts and scatters light, by using a second orange-coloured laser to illuminate sodium atoms in the upper atmosphere.

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Putting Einstein to the ultimate test

CSIRO’s Parkes telescope records pulsar signals to try to detect gravitational waves. Credit: David McClenaghan / CSIRO

Einstein’s general theory of relativity predicts them, and they could be scattered throughout the Universe. But so far, gravitational waves— ‘ripples’ in the fabric of space and time—have never been detected. Several Australian teams of astronomers are trying to catch the first signs of one.

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Fresh Science 2010

Each year we identify early-career scientists with a discovery and bring them to Melbourne for a communication boot camp. Here are some of their stories.

More at www.freshscience.org.au

Print your own lasers, lights and TV screens

Print your own lasers, lights and TV screens
Jacek Jasieniak sprinkling quantum dots. Credit: Jacek Jasieniak

Imagine printing your own room lighting, lasers, or solar cells from inks you buy at the local newsagent. Jacek Jasieniak and colleagues at CSIRO, the University of Melbourne and the University of Padua in Italy, have developed liquid inks based on quantum dots that can be used to print such devices and in the first demonstration of their technology have produced tiny lasers. Quantum dots are made of semiconductor material grown as nanometre-sized crystals, around a millionth of a millimetre in diameter. The laser colour they produce can be selectively tuned by varying their size.

Cling wrap captures CO2
Colin Scholes operates a test rig for his carbon capture membrane. Credit: CO2 CRC

Cling wrap captures CO2

High tech cling wraps that ‘sieve out’ carbon dioxide from waste gases can help save the world, says Melbourne University chemical engineer, Colin Scholes who developed the technology. The membranes can be fitted to existing chimneys where they capture CO2 for removal and storage. Not only are the new membranes efficient, they are also relatively cheap to produce. They are already being tested on brown coal power stations in Victoria’s La Trobe Valley, Colin says. “We are hoping these membranes will cut emissions from power stations by up to 90 per cent.”

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Making light work of photonic chip fabrication

Macquarie University laser physicists are part of a consortium developing a micro-processing platform that will revolutionise photonic chip fabrication. This technology has implications for a diverse range of applications such as fibre-to-thehome (FTTH), smart sensor arrays for aircraft, biosensing and astronomy.

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