Research on optical fiber phased array method of retina-like array structure

In an optical fiber phased array, the array layout of the outgoing beam has a crucial influence on the coherent combination performance of high-power lasers. Aiming at the problem of low energy synthesis efficiency caused by the difficulty of breaking through half the wavelength of the existing optical fiber phased array element spacing, a retina-like multi-ring optical fiber phase-control method was proposed, and a circularly symmetrical distribution structure was designed. Keeping the positions of the central array element and the outermost ring array element unchanged, a particle swarm algorithm was used to optimize the spacing of the remaining elements between the rings to obtain the best far-field coherent synthesis performance. The simulation results show that, compared with the traditional optical fiber phase-control method, the energy concentration of the proposed array layout is increased from 0.562 to 0.921, and the peak sidelobe level is compressed from 0.212 to 0.043.