Laser diodes at the four corners

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The active region of the laser diode is in the intrinsic (I) region, and the carriers (electrons and holes) are pumped into that region from the N and P regions respectively. OverviewA laser diode (LD, also injection laser diode or ILD or semiconductor laser or diode laser) is a device similar to ain which a diode pumped directly with electrical current can create. Such devices require so much power that they can only achieve pulsed operation without damage.

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