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To collimate and focus the output beam, the laser diode is often bundled with a lens or other optical component. The Laser Diode structure is crucial to its performance since each layer plays a unique role in the device's capacity to generate coherent light. Understanding how a laser diode works requires knowledge of its structure. Connecting it to the device and then turning on the power supply implies that the light created in the semiconductor structure trapped within the Resonator (between the mirrored shells) will not be able to escape, as is the case with standard LEDs. The intensity of the beam must be high enough to penetrate this semi-permeable covering.

If a power source (such as batteries) is attached to the Laser Diode, current begins to flow through its structure, resulting in photon generation. A handful of these photons ricochet around the structure's mirror sides, passing through the narrow zone at the semiconductor junction. A handful of them may come into contact with excited atoms. That is, atoms that have absorbed some energy and are resolved to “dispose” of it. What is the source of this energy? It is derived from the power source. Without a doubt.

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