The Benefits Of An RGB Laser

By Cornelia White


An RGB laser is that laser that emits three primary colors of light. These are red light, green light and blue light, hence the acronym RGB. These can be produced in a single beam for all the three colors or separate beams for each of the color. Through the process of optical amplification of stimulated emissions of electromagnetic radiations, it is possible to obtain many more colors from these primary colors.

RGB lasers are being exploited as an alternative to arc lamps sources (beamers). Although arc lamps have been used for a long period as a source of beams particularly because they are much cheaper, they suffer from setbacks such as limited lifetime, high wall-plug efficiency is impossible, poor image quality as a result of poor spatial coherence and the fact that available color space is not wide enough. For this reasons, the former is becoming more popular RGB sources are much more popular.

The success of these lasers has to do with the coherency of wavelengths. They are both coherent in time and space to each other hence the possibility of inferences. The change of phase properties happens at the same time over a long distance making them preferred for entertainment and other professional uses.

The narrow optical bandwidth of the three types of beams produced put them close to monochromatic beams, a property that makes them able to produce very sharp and clear images on color mixing. For this reason, their applications are increasing, not forgetting the use in cathode tubes, lamp based beamers, color printers and many types of projectors.

RGB sources however suffer from a major setback given that the power level that is emitted is usually of low level. Most cinema projectors for instance require up to 10 W per color or even more. This level of power sufficiency, maturity or even cost effectiveness is still beyond the existing RGB scanners. When it comes to beam quality, these machines have to operate with high quality beams for them to perform effectively.

This are at times fitted with power-modulators particularly in the instances where the use of optical modulators is not practical due to low-power miniature devices. This is done to achieve better signals and laser diodes are used in most of the occasions. These particular diodes help achieve increased bandwidth to tens or hundreds of megahertz which in turns significantly improves resolutions.

The construction of RGB lasers can be achieved in several manners with the most common ones involving the use of three different lasers with each producing one of the three colors. This method of visible beams however comes with several limitations in comparison to the other methods that employ the use of near infrared rays.

The other method is the use of an infrared solid-state laser where a single near-infrared laser generate a single color that then undergoes through different stages of nonlinear frequency conversion to produce the three colored beams. There are many other schemes of producing the desired wave lengths such as through combination of parametric oscillators, some frequency mixers and even frequency doublers in addition to other methods.

With the technological advancement, better performing RGB laser machines are being produced. With the current attempt to introduce the fourth color in this type of laser, something that will even improve their performers for the better. The expert prediction is that these forms of lasers will be replacing the other forms of beamers.




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