A laser module is a small laser system designed as a highly-portable, multi-purpose laser generator. They usually look like small, round metal cylinders a few inches in diameter, though they are designed in other shapes as well. Laser modules tend to be low-power and low-intensity compared to other, non modular lasers. For this reason, laser modules are used in fewer industrial processes than other lenses. They are ideal for carpentry applications; laser levels are among the most helpful tools available to carpenters.
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One type of the low power and low intensity laser modules is the hand-held, battery powered laser pointers that are helpful in demonstrations and presentations because they are used to direct an audience's attention to visual aids. Some laser modules are capable of producing beams that can cause singeing and burning to some plastics, but they are mainly novelties; the exceptions are the largest varieties of laser modules that are connected to dedicated power sources and used in professional applications. Because many laser modules are designed as novelty products, they are made available at a variety of wavelengths. The wavelength of a given light source dictates the color in which the light appears to the human eye. Short wavelengths appear blue-violet, medium wavelengths appear green-yellow and long wavelengths appear orange-red.
Laser is an acronym for Light Amplification by Stimulated Emission of Radiation. Just like larger, industrial lasers, laser modules create laser beams by electrifying a gain media and focusing the light. Gain media are solid, liquid and gaseous materials that, when excited by an electric current, emit radiation in the form of light. That light is then directed by strategically placed mirrors within the laser module and focused by at least one lens. Because laser modules are usually small and mainly intended for non-industrial purposes, their systems of light generation and their constituent parts tend to be smaller, less expensive and less effective than those of other, more powerful laser systems. Laser modules frequently make use of diodes as a means of beam generation. Diode lasers involve a combination of specially treated crystalline plates that generate a laser beam when electrified. They are most frequently used in telecommunication applications, as barcode readers in stores and libraries, as laser pointers and as data scanners in small electronics like CD and DVD players. Stronger diode lasers are increasing in prominence as tools for medical procedures; they can be used to create small, sterile incisions in surgical and dental procedures.