In this The Learning Circuit lesson, Karen teaches about laser diodes. She begins by explaining how a standard PN diode works. However, laser diodes are PIN diodes. Understanding the I, which stands for “intrinsic” layer, is important to understanding what makes laser diodes different, and how they are able to produce such a small, focused beam. Since laser diodes can be dangerous, Karen reviews laser safety, then wraps up the video by showing off some of the many uses for laser diodes. Keep your eyes peeled for the next video from The Learning Circuit where Karen shows how to use a laser diode to make a trip wire alarm! http://bit.ly/3nJP5tU

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