Results of the study of acoustic phenomena and changes in the structure of the microwave (2.45 GHz) discharge in liquid hydrocarbons in time are presented. Discharge was ignited at the tip of microwave antennas with conical or rounded ends. Petroleum solvent Nefras was chosen as representative of liquid hydrocarbons. Electret microphone and high-speed video cameras were used to study the discharge. It is shown that the discharge is always attached to the top of the cone in the case of the conical end of the antenna whereas ignition of the discharge generates in the gas part of the reactor a set of acoustic oscillations with frequencies corresponding to the characteristic oscillations of the reactor.

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The article presents the results of developing the single-frequency pulsed Nd : YAG laser system at the 660 nm wavelength with a pulse duration of 50 ns and repetition rate of 1-10 Hz, operating in a Q-switched mode with injection of external radiation. Various schemes of forming a feedback system for controlling the spectral composition of the laser system are considered. It is shown that the method of locking the master oscillator frequency to the mode of the pulsed laser cavity has a number of advantages over the method of stabilizing the cavity length. Keywords: Solid-state laser, Q-switching modulation, injection of radiation.