Quantum cascade lasers are made up of many thin layers of semiconductor. An injected electron makes a small energy transition as it moves from one layer to the next, emitting light on each cascade.

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After winning the Boulder Badge from Brock in Pewter City, it's time to journey through Mt. Moon to Cerulean City, where Gym Leader Misty awaits you. Beat her, and you'll obtain the Cascade Badge.

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