Ultra-Low-Threshold Quantum-Confined Lasers Are Indeed Superb, But How "Quantum" Are They?

Most, if not all, semiconductor lasers manufactured today, which are key components in consumer items such as CD-ROMs and laser printers, are of the quantum well type. What gives these lasers their unequivocal superiorities? Is quantum confinement solely responsible? This article discusses some of these issues, and where the future may lie.

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