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Researchers have made strides in laser design, material growth and laser fabrication that have greatly increased the output power and wall-plug efficiency of quantum cascade lasers. They have demonstrated individual lasers, 300 of which can easily fit on a penny, emitting at wavelengths of 4.5 microns, capable of producing over 700 milliwatts of continuous output power at room temperature and more than one watt of output power at lower temperatures.

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