How a Laser Works


How a Laser Works

How a Laser Works

“Bill shows how the three key characteristics of laser light – single wavelength, narrow beam, and high intensity – are made. He explains the operation of a ruby laser – the first laser ever made – showing how electronic transitions create stimulated emission to give coherent light, and then how the ends of the ruby cavity create a narrow wavelength highly collimated beam. You can learn more about laser in the EngineerGuy team’s new book Eight Amazing Engineering Stories”
Retrieved: 2/7/2013



  1. I was hoping this video would explain why stimulated emission creates light of the same phase, frequency, polarization, and direction as the initial light.

  2. I wonder what purple glow pgwder is made from…A friend of mine has some very old glow-in-the-dark wall plates from the 1960s which glow purple.

  3. sorry to disapoint you, but there are already 3W Handheld Lasers out there, so yours is not the strongest one. But well, 1.4W is definitly extremely strong!

  4. I can't remember from my physics lessons why can't you make the blue light to change the level of energy with the glass so it can glow but you can with the ruby…is it because the extract energy of the electrons of the glass is higher then the ruby? Or it had to do with the quantified photon energy (E=nhf) thing? ( Sorry for by bad english…French canadian hahaha)

  5. i still dont get what wave length is and if the wavelegnth on a laser is smaller is that better or worse and is wave length nm is it the same but just a shortcut


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