How Lasers Work [Video]


In the following video, Bill Hammack, the engineer guy, 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.

[The Engineer Guy]

3 Responses to How Lasers Work [Video]

  1. I strongly disagree with the "single wavelength", which is quite abusive. Saying that one can get a "quite narrow spectra" would be more accurate. That is, one as to keep in mind there is a balance between laser "pulse" duration and its spectral extend. Typically a laser with ~40fs pulses will have a ~40nm broad spectra, if you go to shorter pulses, the spectra will be broader and vice versa.