Figure 2
From: Dressed Gain from the Parametrically Amplified Four-Wave Mixing Process in an Atomic Vapor

Intensity evolutions of the Stokes (a) and anti-stokes (b) gain peaks in the probe channel versus Δ2 by increasing the 85Rb atomic density.
The atomic density is about 3 × 1013 cm−3 at 120 °C. The dotted lines are guides for eyes.