Lasers are everywhere, and David Coutts helps us explore some of the quantum ideas behind these amazing light sources.David is a professor at Macquarie University and has worked with numerous exciting lasers - including some that produce light in Aussie green-and-gold colours. It's fascinating to realise just how widely lasers are used, even if they're often a bit behind the scenes. They can also be quite exciting, with beams able to drill a hole in your eye or even blast rust off metal! David explains how lasers work and various ways they can be built.Have you ever thought about lasers powered by nuclear explosions? Subscribe and share with your friends!

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