St. Andrews scientists develop LED-powered 'rainbow' laser

May 20, 2008--Physicists at the University of St. Andrews (Fife, Scotland) have developed a laser with a variety of colors that is powered by a simple, low-cost light-emitting diode (LED). This compact visible laser can be created at a fraction of the cost of existing technologies and used for a wide range of applications, from medical treatment to light-emitting clothing.

May 20, 2008--Physicists at the University of St. Andrews (Fife, Scotland) have developed a laser with a variety of colors that is powered by a simple, low-cost light-emitting diode (LED). This compact visible laser can be created at a fraction of the cost of existing technologies and used for a wide range of applications, from medical treatment to light-emitting clothing.

The breakthrough by physicists professor Ifor Samuel and Graham Turnbull uses plastic-like semiconducting materials. These flexible light-emitting materials combine the virtues of semiconductors with the simple manufacture of plastics, and have even been used to make a light-emitting sticking plaster for the treatment of skin cancer. Professor Samuel said, "For over forty years visible organic lasers have required another laser to make them shine. We have now developed a low-cost, easy to make plastic laser, which converts the light from an LED (of the kind used in torches and traffic lights) into laser light. LEDs can be battery powered, and so this hybrid LED-laser approach can make very simple compact emitters. The lasers can give a variety of colours and are suitable for various applications such as spectroscopy or chemical sensing."

Collaborator Graham Turnbull said, "The new lasers are incredibly cheap and disposable and so could be used in single-use medical diagnostics, or in extreme environments such as sensing for explosives.

Conventional visible lasers can cost anything between a few hundred pounds to tens of thousands, but our new laser can be created for less than five pounds. These LED-lasers offer a better, smaller and brighter alternative to conventional light sources. They are the next generation of low-cost lasers."

For more information, visit www.st-andrews.ac.uk.


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