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Post by etiosliva143 on Nov 11, 2011 5:20:01 GMT -5
Most people have seen a laser diode in action if they have ever seen a bar code scanner in action. These scanners are commonly found at grocery stores and all bar code scanners use a laser diode to function. It creates the laser that passes over the black bars in the bar code. These black bars represent numbers, which the computer powering the cash register can interpret to identify the item being scanned.
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Post by jaitley143 on Nov 11, 2011 5:46:32 GMT -5
When the laser diode is created, a crystal is used and a thin layer of that crystal is purposefully altered to create an area that stays negatively charged and an area that stays positively charged. These areas are known as the n-type region and the p-type region, respectively. Together they form what is known as a p-n junction. The p-n junction forces electrical current passing over the crystal to be injected from both sides. Laser Diode |
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