A simpler method for creating multicolor lasers

Normally, to get different red-blue laser light sources in the same device (like a 3D Blu-ray drive), one would have to create three separate laser sources. These laser sources will be combined with different semiconductor materials. However, engineers from Brown Island Rhode University have now succeeded in finding a way to create multicolored lasers using semiconductor-based nanocrystals . And this success will help diversify laser colors in a simpler way to apply to digital media.

Working with QD Vision technology engineers, Brown University team created nanometer-sized semiconductor particles called quantum dots or nanocrystals with cadmium and selenium alloys. The exterior is covered by zinc, cadmum, sulfur alloy and an organic colloid molecule.

The size of quantum dot nanoparticles will be precisely controlled during production. This is the color format of the laser beam: red comes from 4.2 nanometer core crystals, green from 3.2 nanometers, and 2.5-nanometer-sized molecules will produce blue light. seawater. Other colors can also be created in the same manner.

While the core size is the deciding part of the light color, the crystal structure and the outer shell also play a very important role: they reduce the number of crosstalk (a form of influence) that helps The process of color formation is successful. Other researchers have tried to eliminate crosstalk by boosting energy input, although this energy will eventually be lost as heat.

To create lasers using new nanocrystals, they use a method such as hitting a varnish on the nail - the solution contains crystals that are thinly coated on a piece of glass. When the glass is dry, it will lie between two special mirrors. The end result is that the laser will appear through that surface. Glass pieces can cut many different shapes, increasing the application of this technology.

Arto Nurmikko, a professor of engineering and head of the project, said: 'We have shown that they not only produce light but also laser light. In principle, we will benefit greatly from this method. The production of lasers will become cheaper, can produce all colors and be applicable to all surfaces regardless of shape. This is suitable for future technology devices'.

Reference: Gizmag