Emission Profiles of Laser-Induced Optical Satellite Lines in a Helium Plasma

We have measured the spectral line profiles of the optical satellites emanating from the $(2^{3}S,2^{3}P)-(4^{3}S,4^{3}P)$ excited state manifolds of a low-pressure helium plasma. These satellites are induced by the presence of a C${\mathrm{O}}_2$ laser field. Detailed spectra are presented for the $2^{3}P-4^{3}S$, 4713-Å HeI allowed line and its associated near satellite. A theoretical model, valid for large, near-resonant interactions is described. This theory is seen to be in good agreement with the experimental results.