Interference-induced peak splitting in EUV superfluorescence
  We investigate the laser-induced quantum interference in EUV superfluorescence occurring in a dense gas of $\Lambda$-type helium atoms coupled by a coherent laser field in the visible region. Due to the constructive interatomic and intraatomic interferences, the superfluorescence can split in two pulses conveniently controlled by the gas density and intensity of the driving field, suggesting potential applications for pump-probe experiments. 
Ni Cui, Christoph H. Keitel, Mihai Macovei
physics.atom-ph physics.optics quant-ph