Laser Diode Circuit

Posted on Feb 6, 2014

Unlike LED light, a laser`s light output is more concentrated, meaning it has a smaller and more narrow viewing angle. This means it must be directed at its source more directly in order to be picked up. Laser light is also monochromatic, meaning laser light isn`t composed of several lights combined together, but one light of the same wavelength a

Laser Diode Circuit
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nd energy. Normally with LEDs, the different light outputs are based upon different colors combined. One such example is green light. To output green light, blue and yellow lights are combined to give green. Lasers, for the most part, do not follow this. Laser lights have a single spectral color and is almost the purest monochromatic light available. Laser diodes are used in CD players, CD-ROM drives, and other optical storage drives. They are used in laser printers, laser fax machines, laser pointers, measurement equipment, bar-code and UPC scanners, and in high-performance imagers, as well as various other applications. These are just the most popular and used aspects of them. A driver circuit is a circuit which can limit appropriately the amount of current being fed into the laser diode, so that it can function correctly. Too much current and the laser diode will blow. Too little current and the laser diode will not have sufficient power to turn on and operate. Therefore, a driver circuit is needed to give precisely the correct range of current needed so that our diode will operate. The type of regulator we will use is the LM317 adjustable voltage regulator. The reason we need a heat sink is to dissipate excess heat created by the regulator. For example, if we input 6V into the regulator and it only regulators out 3V, this means that 6V-3V= 3V is dissipated as heat energy. To safely get rid of this excess heat energy, we...

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