Radiation Patterns Formed by Sapphire Capillary Needles with Different Shapes of Internal Channels
Paper #9174 received 7 Oct 2024; revised manuscript received 18 Nov 2024; accepted for publication 18 Nov 2024; published online 14 Dec 2024.
DOI: 10.18287/JBPE24.10.040315
Abstract
Compact sapphire capillary needles for laser-assisted therapy connected to optical fibers by the means of internal channel closed from one side transmit laser radiation to the tissues with minimal loss of energy and simultaneously protect the fibers. The geometry of the internal capillary channel with the curved bottom is a key factor in the formation of the output beam’s shape. Various curvatures of the bottom in combination with the different angle of conical needle’s tip are studied in detail. When the tissue is covered in a liquid, we have observed forming the ring radiation pattern with a sharp axial peak without additional diaphragms or spatial light modulators. Coagulation of ex vivo liver tissue samples using continuous laser source with 1.06 μm wavelength, offered opportunity to obtain small coagulated spots without carbonization with the diameter of at least 0.8 mm and to enlarge them evenly by tuning the source output power.
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