Population Inversion in Lasers - A Level Physics

[@mengziyue4574]

I don't know how is this even A-level topic....You explained much better than my Photonics lecturer in uni, no overdose of math that only causes confusion, only the raw, abstract concept.

[@zeinabrahmani963]

I think you should emphasize that for the stimulation emission to occur, the atom should be in the excited state. therefore when it is hit by a new photon, the atom will go to the ground state and 2 photons are generated (one from the hitting photon, the other from atom coming back to the ground state)

[@meghax4480]

Thank you so much, the concept is very well explained!

[@krishvasa7644]

Thanks a lot for the awesomeeee explanation!

[@alltime5244]

at 3:13 I think you mean electrons instead of atoms I'm not sure though I'm just finding this a bit confusing

[@alltime5244]

Brandon White thank you I appreciate the help

[@BZaks]

you are right he meant electrons, atoms don't move up and down energy levels

[@AfricanGotPace]

@@BZaks no the atoms absorb the photons which make electrons move up energy levels

[@alltime5244]

@First Name Update: I went from a D student to actually get a B (almost A :( )and I seriously attribute all of my success to this channel

[@joshuagardiner9096]

3:10 how come it doesn't go back down to ground state and release a photon?

[@joshuagardiner9096]

how come spontaneous emission doesn't take place?

[@natedrake85]

He stated that photons are absorbed by the level that has larger numbers of electrons

[@TheHHPodcast]

Sorry to tell you but this was actually quite confusing. It made me understand less