Inversion density threshold for Rabi oscillations and modified small-signal gain in extreme-ultraviolet lasers.
An expression is proposed for a threshold discriminating between classical quasi-steady-state amplification and a strong pumping regime where a new dynamic behavior shows up in plasma-based extreme-ultraviolet (XUV) lasers. The criterion derived is applied to laser systems currently investigated in various laboratories. It is found that only high-gain XUV laser systems can be driven in that dynamic regime, associated with Rabi oscillations. For those systems, the small-signal dynamic gain accounting for the exponential amplification of the laser intensity is shown to be significantly smaller than the adiabatic value usually inferred from numerical simulations.
CEA DIF, Arpajon, France. olivier.larroche@cea.fr
Olivier
O
Larroche
Limin
L
Meng
Andréa
A
Le Marec
Annie
A
Klisnick