METHOD FOR LASER RECORDING OF INTEGRAL WAVEGUIDES Russian patent published in 2022 - IPC G02B6/10 

FIELD: laser technology.

SUBSTANCE: invention relates to the field of laser processing of materials, in particular to a method for laser recording of integral waveguides based on a local change in the refractive index of a glass-crystal material by focused femtosecond laser radiation. The claimed method for recording integral waveguides, based on a change in the refractive index of a transparent dielectric, includes focusing femtosecond laser pulses into the volume of the dielectric, the movement of the focused beam along a given trajectory and sequential recording of several parallel tracks bounding an area of unmodified material. At the same time, a lithium-aluminum silicate sitall is used as a transparent dielectric, and a femtosecond laser generates pulses at a wavelength of 1030 nm, with a duration of 180÷600 fs, with a repetition frequency of 1÷100 kHz, with an energy of 200÷4000 NJ when a focused laser beam is moved by a lens with a numerical aperture of 0.45÷0.65 at a speed of 200÷1000 mcm/s, with a step between the tracks forming the cylindrical shell of the waveguide, 3÷5 mcm. The obtained result can be used to create waveguide devices of IR optics, including thermostable integrated optical circuits.

EFFECT: possibility of laser recording of a cylindrical waveguide shell with a reduced refractive index in the volume of a transparent glass–crystal matrix.

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