Ophthalmosurgical refractive solid-state laser system Russian patent published in 2021 - IPC A61F9/08 

FIELD: medical laser technology.

SUBSTANCE: invention relates to medical laser technology and can be used in ophthalmology for operations to change the curvature of the outer surface of the cornea in order to eliminate refractive errors in myopia, hypermetropia, and astigmatism. The ophthalmosurgical refractive solid-state laser system contains a solid-state pulsed nanosecond laser with active elements based on Nd crystals: YAG (yttrium-aluminum garnet, doped with neodymium) with a radiation wavelength of 1,064 nm with Q-factor modulation of the resonator by an electro-optical gate and cascade nonlinear conversion of the main wavelength of radiation into radiation of the second, third and fifth harmonics, with the generation of the fifth harmonic wavelength by mixing the second and third harmonics with a wavelength in the fifth harmonic of 213 nm, pulse duration of 10 ns, pulse energy of the fifth harmonic of 1 MJ, pulse repetition frequency of 300 Hz, the solid-state laser is connected to a power supply unit, an aspiration system, a lighting system, equipped with a pilot laser of the visible range, a video camera of the active tracking system combined with a binocular microscope, a radiation delivery module containing rotary mirrors and a two-coordinate galvanoscanner, which has a common computer control system. The solid-state laser is designed according to the scheme of a single-mode master generator with compensation for thermo-optical distortions - a powerful two-pass amplifier, pumped by laser diodes, with a fifth-harmonic autotracker, a pancratic system installed in front of the galvanoscanner, a polarization attenuator of the fundamental frequency energy containing a phase half-wave plate (λ/2) and a polarizer. The housing of the system is equipped with a thermal stabilization system.

EFFECT: application of the invention will make it possible to obtain an increased stability of the characteristics of the radiation energy at a high pulse generation frequency, a high resolution of the forming system.

1 cl, 2 dwg