Microscopic Theory of Laser Master Equation up to the Fourth Order. I
Toshihico Arimitsu, Tetsuo Tominaga · Journal of the Physical Society of Japan · 1982
A laser master equation is derived microscopically by using the time-convolution-less formulation of the damping theory up to the fourth-order terms with respect to the coupling constant between the laser field and the atoms, in order to investigate the quantum effect and the system size (number of the active atoms) dependence of the kinetic operator . The master equation is compared with the equation given by the time-convolution formalism which is essentially equal to the master equation derived by Haake.