QUANTUM THEORY OF A THRESHOLDLESS LASER

I. Protsenko, P. Domokos,* V. Lefevre-Seguin, J. Hare, J. M. Raimond, and L. Davidovich Lebedev Physics Institute, Leninsky Prospect 53, 117924 Moscow, Russia Laboratoire Kastler-Brossel, Departement de Physique de l’Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris, France Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, RJ, Brasil ~Received 26 May 1998!