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RGB Lasers

Laser pointers of the 1980s were rare because of the high prices. These pointers were only usually used by professors or lecturers who want to train the distracted student's eye on a specific part of the screen !! However, the 1990s saw an increase in laser pointers production, and market competition brought the prices down.

Demo video sourced from and copyright of youtube

#Majority of laser pointers can be bought ranging from ?2 to ?30 for the red laser diode with 630nm-680nm wavelength. Power levels of hand-held lasers are typically measured by milliwatts. Your average laser will have an output of 5mW in USA. They fall into the general category of Class IIIa laser devices. This is the classification given to devices that are safe for consumer usein USA . However in Uk and Eu , this classification is class 2 and power output is less at <1mW

Red laser pointers are the ones that are frequently seen by consumers, but there are more colours of lasers. One of them is the green laser pointer, which is around 50 times stronger as compared to red lasers. They have a wavelength of 532nm, thus making them visible even when in mid-air. Green laser pointers can be used to locate objects that are as far as 2.5 kilometers even at night. Red lasers are definitely cheaper than green lasers, which cost typically ?20 to ?80 for lower powered models. Manufacturers have also been developing blue lasers that have shorter wavelengths around 405nm , 445nm , 450nm , 473nm.

At the base of the pointer or module casing , the light produced is typically only about 1 millimeter wide. The laser light diverges ( spreads) as distance passes. A number of laser pointers have been known to produce lights with wavelengths that are not visible to the naked eye( 808nm ) These are then filtered through a device that doubles its frequency so that it can produce visible light , this is typcially what happens to produce green light.

Another type would be the combination three laser colours which can used for full colour projection systems. This is called an RGB laser. RGB laser systems are basically made up 3 colours of diode laser modules, a diode current supply, a power supplies and control systems.

In 2010 a laser hobbyist created a HAND PORTBLE unit capable of producing white light by combining red,green and blue lasers in the one unit.

Demo video sourced from and copyright of youtube

Many people use lasers as toys for animals such as cats, tools for experiments regarding optics, sights for firearms, and of course, presentations. There have been documented cases of people being put in prison for being stupid with lasers . Lasers have been shined directly into the eyes of truck drivers, musicians, aircraft pilots, and performers on stage. This can prove to be very dangerous. Health agencies have already taken steps to prohibit using lasers for mischief, and concert-goers and guests have been prevented from bringing in lasers. Laws have also been passed against inappropriate use of lasers, such as shining it at a police officer.

Cheap laser pointers, combined with other devices have used to make impressive holograms by hobbyists. Security cameras have also been put out by lasers and street lights have been turned off by lasers due to the photocell that controls them.

A few countries before have used lasers to develop weapons, but a 1996 U.N. resolution has forbidden using lasers for warfare.