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Japanese researchers develop green laser

For a long time, we have had only red and blue lasers due to technical reasons that go beyond the scope of this article. It has taken some 15 years to develop a green laser, but this milestone has finally been reached by a team of Japanese researchers and the implications, at least in projection systems, are enormous.

Right about now some of you are saying: "But I have seen green lasers with my own eyes! They sell them cheap at any magic and jokes shop!" It so happens that these are not "true" green lasers, but use a trick where the frequency of an infrared beam is doubled to produce a green tinted light resembling a laser. With this new discovery it is possible to create a true green laser in a single diode.

The more technical readers among you will note that now that we have green, we have completed the "holy trio" of visual display technologies, the famous "RGB" (which stands for Red, Green and Blue). This means that now we will be able to effectively set up projectors of all sizes and great quality at low cost.

Today for example laser TV prototypes use all kinds of filters to create the green light, but that step is no longer necessary, and this will be all done very energy-efficiently. So this gives us an idea of what we will have in the near future: projectors that can fit in a matchbox and deploy an image in a higher resolution than the best projectors currently in existence at perhaps a price of less than $ 100.

This means a revolution in the world of visual technologies. For the curious that wonder how this type of projector would work, the answer is: similar to how the traditional "electron tube" TV (i.e. the ones we have had for decades, not the flat ones) does.

In these televisions the image is formed by an electron gun that shoots three beams of electrons simultaneously at the same point on the screen. You can imagine these three beams as producing different levels of intensity for the colors red, green and blue, producing a point on the screen of a certain color. The first point is shown in the upper left corner of the TV, then the next point is placed next to it to it's right, and it continues until a row of points is finished, the proceed with the next row, and the next, 'till the process reaches the last point in the lower right corner of the TV, forming a complete image.

However this entire process is quite fast, about 25 to 60 times per second depending on the technology used, but the effect is the same: each point is drawn so many times so quickly that during that time what we notice is a moving picture.

Likewise, these lasers would do something similar, just that instead of using electrons, it will use lasers beams, providing a much sharper image, with better contrast and a much greater range of colors.

Another technique that is used today in laser projectors is to shoot several laser beams of different colors to tiny mirrors on a chip that are then reflected to different points on the screen. This is similar to the DLP technology from Texas Instruments.

We expect great things from these new discoveries.