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NTU research embraces laser and sparks cool affair
Date:1/30/2013

Bulky and noisy air-conditioning compressors and refrigerators may soon be a thing of the past.

With the latest discovery by scientists from Nanyang Technological University (NTU), current cooling systems which uses refrigerant harmful to the ozone layer could be replaced by a revolutionary cooling system using lasers.

This discovery, published and featured on the cover of the 24 January 2013 issue of Nature, the world's top scientific journal, could also potentially lead to a host of other innovations. This includes making huge Magnetic Resonance Imaging (MRI) machines, unwieldy night vision goggles and satellite cameras - all of which require extreme cooling systems - even more compact and energy saving.

This breakthrough in laser cooling technology can even lead to the development of almost sci-fi like computer chips that cool on their own, minimising heat and thus prolonging battery life for portable devices like tablets and smart phones.

Assistant Professor Xiong Qihua from the School of Physical and Mathematical Sciences and the School of Electrical and Electronic Engineering had cooled down a semiconductor from 20 degrees Celsius down to minus 20 degrees Celsius. Before this, the cooling of semiconductors by laser has never been proven.

The material, Cadmium Sulfide, is a type of group II-VI semiconductor commonly used in solar cells, sensors and electronics.

"If we are able to harness the power of laser cooling, it would mean that medical devices which require extreme cooling, such as MRI which uses liquid helium, could do away with their bulky refrigerant systems with just with an optical refrigeration device in its place," Prof Xiong said.

"Not only that, but it would also remove the need for compressors and coolants in air-conditioning and refrigerators used in our homes and automobiles, saving space, energy and green house gases which are harmful to our ozone layer.

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Contact: Lester Kok
lesterkok@ntu.edu.sg
Nanyang Technological University
Source:Eurekalert  

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NTU research embraces laser and sparks cool affair
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