High-frequency self-modulation of the radiation emitted by a linear laser with constant losses

A theoretical analysis is made of the appearance of high-frequency pulsations in a linear laser with constant losses. Nonlinear differential equations with a variable parameter are used for the radiation density and gain of the active medium. It is shown that the high-frequency self-modulation is to the delay of the action on the active medium of the radiation arriving from different points in the laser. The dependence of the period and depth of modulation on the laser parameters is obtained. The results of analytic investigations are compared with computer calculations.