Development of laser technology has led laser handpieces to gain popularity. Due to good characteristics of laser light, their use in dental medicine has greatly increased. That's why in certain applications they complement or replace existing conventional drill handpieces. Surgeries are cleaner and more favorable for the patients, as they feel less operative and postoperative pain. Light travels from the laser source down the optical fiber to the handpiece. Depending on the type of application, the fiber tips of different thicknesses can be placed at the end of the handpiece. The main challenge is to design an optical system that transfers laser light between the input and output fiber (fiber tip), with retaining maximum efficiency and repeatability. In the process of product development, we defined some target specifications, reviewed competitive products and came up with a number of possible optical solutions. We made optical calculations and chose the most suitable lens. After creating design concepts and selecting suitable materials, we made a prototype handpiece. It is modern, ergonomic, waterproof and resistant to external influences. Laboratory measurements show that the output power efficiency of the designed handpiece (77%) is similar to the expected 80%. In addition, we developed a handpiece with better efficiency and repeatability than some competitive handpieces already present on the market. We also measured how the change of axial distance between lens and fiber tip or rotating the fiber tip affects the output power.
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