Ak. Popov et al., Quantum interference and Manley-Rowe relations in resonant four-wave frequency mixing in an optically thick Doppler-broadened medium, JETP LETTER, 69(12), 1999, pp. 912-916
It is shown that under resonant interaction conditions certain notions in n
onlinear optics which are based on the Manley-Rowe relations no longer hold
because of the interference of elementary quantum-mechanical processes. Th
is conclusion is illustrated by numerical examples corresponding to the exp
eriments performed. (C) 1999 American Institute of Physics. [S0021-3640(99)
00512-5].