Femtosecond laser operation flat-topped beam shaping optical system

By converting the Gaussian beam in femtosecond laser surgery into a flat-top beam, the problem of uneven energy distribution is solved, achieving uniform and precise cutting of the surgical area and improving surgical quality and safety.

CN122056738APending Publication Date: 2026-05-19SUZHOU AITOMIAO MEDICAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610432928.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

In current femtosecond laser surgery, the uneven energy distribution of the Gaussian beam leads to excessive ionization of tissue in the surgical area, irregular incisions, and difficulty in precisely controlling the cutting depth, posing a high risk, especially to patients with thin corneas and high refractive errors.

Method used

The Gaussian beam is converted into a flat-top beam with uniform energy distribution using DOE diffraction optical elements. The beam is then precisely focused using a beam expander, DOE shaping module, and focusing scanning module to eliminate the energy center peak and edge weakness of the Gaussian beam, ensuring the uniformity and accuracy of the cutting process.

Benefits of technology

It achieves uniform and precise minimally invasive cutting in the surgical area, avoids tissue thermal damage and excessive ionization, results in a smooth incision, reduces postoperative inflammatory response and recovery period, and improves surgical quality and safety.

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Abstract

The invention discloses a femtosecond laser operation flat-topped beam shaping optical system which comprises a laser, a beam expander, a DOE shaping module and a focusing scanning module. The laser is used for outputting a femtosecond Gaussian laser beam, and the femtosecond Gaussian laser beam sequentially passes through the beam expander, the DOE shaping module and the focusing scanning module and then acts on an operation area; the beam expander is used for expanding the diameter of the femtosecond Gaussian laser beam to the beam diameter used for cutting the light path; the DOE shaping module comprises a DOE diffractive optical element; the DOE diffractive optical element is arranged on a path of the femtosecond Gaussian laser beam and is used for converting an incident Gaussian beam into a flat-topped beam with uniformly distributed energy through phase modulation; the flat-topped light beam has no local energy peak value, thermal damage and excessive ionization of traditional Gaussian laser to normal tissues of eyes are avoided, postoperative inflammatory response is light, the tissue recovery speed is increased, and the risk of operative complications is reduced.
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