Real-time automatic temperature monitoring in fiber laser ablation of biological tissue surgery

Real-time temperature monitoring during fiber laser ablation surgery on biological tissues is necessary to improve the safety and optimize the treatment effect of the surgery. For optical fiber laser ablation surgery using a 980nm infrared laser, this article applies CaWO₄:Er³⁺/Yb³⁺ nanoparticles to adhere to the end of the optical fiber. The 980nm laser excites the CaWO₄:Er³⁺/Yb³⁺ nanoparticles to generate up-conversion green light. The green fluorescence peak ratio is used for real-time measurement of the temperature at the optical fiber's end, which corresponds to the temperature of the heated tissue. This article designs the optical path, calibrates the relationship between the fluorescence peak ratio and temperature, and obtains a fitting expression for the temperature and fluorescence peak ratio. This temperature sensor is expected to be used for automatic temperature measurement in optical fiber laser ablation surgery of biological tissues. Compared to existing technologies, this experiment uses a 980nm laser for ablation while simultaneously excited the fluorescence at the end of the optical fiber with this wavelength.