Difference between pn junction laser and laser diode
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Explanation:
The main difference is that laser diodes are manufactured having a long narrow channel with reflective ends. This acts as a waveguide for the light. In operation, current flows through the PN junction and light is generated using the same process that generates light in a light emitting diode.
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Explanation:
LED light comes from spontaneous emission, whereas laser diode light arises from stimulated emission. Thus, LEDs generally have lower output powers and omnidirectional emission. LEDs are efficient and small like their laser counterparts but typically operate at lower drive currents and are less expensive.
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