He-Ne Laser

A helium-neon laser takes advantage of the similarity in energy between an excited state of He gas and a different state for Ne gas. The He is pumped into the excited state, and the lasing transition occurs in the Ne, emitting red light of 633 nm.

[@mortezakhoshbin]

wish you healthiness in ramadan month🥰🥰🥰

[@GoutamDAS-ls1wb]

Excellent video presentation. Question--what about the conservation of angular momentum in collisional transfer of energy from Helium to Neon? Also this means that the electron in the 2p^5 orbital has the same spin as the electron in the 5s level in the Neon excited state?

[@marian8395]

Greetings, I've got a question which is bugging me a bit.

[@mortezakhoshbin]

miss you! will be there more lectures?

[@markpwoodward]

Why include the He at all? It seems we could just directly "pump" the Ne. As a guess, is it because He has fewer energy levels between the ground state and the desired energy level, so heating will produce more molecules in the desired energy level? Thank you

[@lukaskobusinski2699]

Do you write backwards?