Competition Between Photon Lasing and Exciton Lasing

Jagjit Nanda, Sergei A. Ivanov, Han Htoon +4 more

R. Lévy, J. B. Grün, Serge Nikitine

Petr A. Kalinin, Vitaly V. Kocharovsky, Vl. V. Kocharovsky

David Petrosyan, P. Lambropoulos

We examine two-photon lasing in competition with the one-photon lasing into a second mode near resonance with a transition to an intermediate state. The model assumes pumping to the upper state of the two-photon transition. After a derivation of the relevant master equation for the atomic system, we consider the Maxwell-Bloch equation on the basis of which we study the steady state and the time-dependent dynamical behavior of the system. We show that two-photon lasing can be sustained in coexistence with one-photon lasing after the latter is saturated. The results are illustrated with an application to a specific atomic system (potassium) as an amplifying medium.

Takashi Mukaiyama

K. C. Liu, Richard L. Liboff

A scheme for lasing action involving excitons in a pure crystal is described. The lasing mechanism depends on the nonboson quality of excitons. We find this property to be exhibited at high exciton density. A criterion for lasing under these conditions is obtained.