Laser self-oscillation control as of a dynamic system

Replacing metal electrical conductors with fiber-optic elements in the marine and river fleets leads not only to metal savings, but also to increased energy efficiency and fire safety, since quartz fiber transmits higher optical power than copper wire ‒ similar electrical power. A promising direction in the management of automatic electric drives and coastal electrical installations of water transport is the use of a laser with a Q modulator. For example, by controlling a laser using a Q modulator on a standing unmodulated ultrasonic wave, chaotic “peak” generation is suppressed and the self-oscillating mode used in practice is obtained. The use of such a laser in an automatic electric drive gives intelligent properties to the control of a water transport facility. However, the causes of self-oscillations and the methods of controlling the auto-oscillations of dynamic objects have not yet been sufficiently studied. In this paper, using a digital model (DM) created on the basis of a three-level system of laser velocity differential equations, the phase and time characteristics of laser self-oscillations as a dynamic system for con-trolling energy losses for fixed values of the energy delivery rate are obtained. The digital model makes it possible to study in detail the self-oscillatory process from the moment of the origin of a closed trajectory, the appearance and elimination of the second harmonic to periodic undamped oscillations in the form of limit cycles in a wide range of control coefficient changes proportional to energy losses. The use of DM makes it possible to register dynamic processes on the phase plane and time sweep in a wide range of changes in delivery rates and energy losses. The calculation results are applicable to the optimization of automated electric drives and coastal electric installations of water transport with laser devices. The proposed DM allows conducting similar studies of dynamic systems of different nature, having a structure of energy levels.