Abstract
As the demand for CO\(_2\) laser surgeries continues to grow, the quality of their main instrument, the laser micromanipulator, becomes increasingly important. However, in many surgery systems, a large ratio of the laser power is wasted due to the reflection from the mirror of a telescopic system, like a Cassegrain telescope, back to the laser side, which not only decreases the system’s efficiency but can also damage the system itself. In this article, we introduce a new design of the micromanipulator telescope for CO\(_2\) laser surgery, which employs a Bessel beam to improve the system efficiency. As in the propagation of a Bessel beam, the power of the light beam can be transferred from the center to a ring shape, the whole power reflected from the first mirror can reach the second mirror and no power goes back to the second mirror hole. The micromanipulator telescope design and optimization are carried out using Zemax Optics Studio, and the integration of the Bessel beam into the system is implemented using MATLAB. Our simulation results show that by applying the appropriate Bessel beam, the system efficiency can reach more than 96%, and the normalized peak irradiance can increase by 40 to 73% for various working distances. In addition to increasing the system efficiency and normalized peak irradiance, resulting in a sharper surgical blade, the use of the Bessel beam enhances the depth of focus, making the system less sensitive to depth misalignment.





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Hosseini-Saber, S.M.A., A. Akhlaghi, E., Saber, A. et al. Bessel light beam for a surgical laser focusing telescope—a novel approach. Lasers Med Sci 39, 33 (2024). https://doi.org/10.1007/s10103-023-03968-y
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DOI: https://doi.org/10.1007/s10103-023-03968-y