METHOD FOR AMPLITUDE, PHASE AND POLARIZATION CONTROL IN PHASED ARRAY OF FIBRE AMPLIFIERS AND CONTROL OF DISTRIBUTED STATE OF INTENSITY, WAVE FRONT AND POLARIZATION OF SYNTHESIZED BEAM IN THE FAR OPTICAL FIELD AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC G02B27/10 

FIELD: laser technology and fibre optics.

SUBSTANCE: invention can be used to create systems for transmitting light energy through free space, wireless optical communications and cryptography, and laser processing of materials. The device comprises a coherent source of linearly polarized radiation, which is divided by a radiation divider into N channels of equal power. Each channel is connected in series with an optical phase-shifting element (phase modulator) that regulates the phase of the optical wave, a polarization controller that regulates the polarization state of the optical wave, a power amplifier with controlled gain based on an active fibre that does not maintain the polarization state, and has an optical collimator at the output. All N optical collimators are located at the lattice nodes and are adjusted so that the optical axes of the output beams are parallel to each other, forming a lattice of beams (subbeams), a small part of the radiation of which is removed using a beam splitter to form feedback channels, and the remaining part of the radiation propagates in in a given direction, forming a synthesized beam in the far optical field, resulting from diffraction overlap and interference of subbeams. The part of the radiation that is used to generate feedback is in turn divided in half by a second beam splitter, forming two feedback channels. The amplitude of the subbeams is controlled by power amplifiers with adjustable gain, which are located after the phase modulators and polarization controllers. Thus, the phase, direction of linear polarization and amplitude of the grating subbeams are independently controlled, the joint action of which leads to the formation in the far optical field of a synthesized beam with a given non-uniform distribution of intensity, wave front and polarization in the cross section.

EFFECT: formation of a synthesized beam with a controlled structure of intensity, wavefront and polarization, by independently controlling the amplitude, phase and direction of linear polarization of individual beams in an array of fibre amplifiers.

5 cl, 17 dwg