Radial profiles of upper- and lower-laser-level emission in an oscillating He-Ne laser

Abstract
Radial profiles of the emission from upper‐ and lower‐laser‐level atoms (Ne 3s2 and 2p4, respectively) have been investigated in a He‐Ne laser. The obtained profiles of emission from Ne 3s2‐level atoms are appreciably broader than the zero‐order Bessel function profile. Change in the radial profiles of population inversion brought about by lasing action have also been investigated and a significant dip in the tube center is observed.