Collisions of He and Ne with Ne* in a helium–neon laser emitting at λ = 0.63 μ

The Lamb dip was used in a study of the dependences of the emission line half-width γ₁ and of the homogeneous broadening parameter γ₂ of the active medium in a helium–neon laser on the pressures p of helium and neon. The pressure dependence of γ₁ was linear and its pressure coefficients were dγ₁/dp_He = 58 ± 3 MHz/torr and dγ₁/dp_Ne = 74 ± 4 MHz/torr. The parameter γ₂ varied linearly with the neon pressure (dγ₂/dp_Ne = 53 ± 10 MHz/torr) and nonlinearly with the helium pressure.