Observation of Dynamic Absorption Properties of Wet Gelatin around $\lambda=6.05$ μm Using a Mid-Infrared Free Electron Laser

概要

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It is essential for soft tissue cutting to precisely predict the effects of laser irradiation before treatment. The purpose of the present study was to investigate the dynamic absorption coefficients of wet gelatin around $\lambda=6.05$ μm (tuned to the OH bending and amide-I bands) during laser irradiation. Wet gelatin was irradiated by a tunable mid-infrared free electron laser within the wavelength range of 5.6–6.7 μm. The incident fluence was fixed at $3.6\pm 0.3$ J/cm2. Structural changes of the irradiated gelatin were observed with an optical microscope. At $\lambda=6.05$ μm, the wet gelatin was efficiently removed due to vaporization of water, and the absorption coefficient during irradiation increased slightly by 30–40% of magnitude from that before irradiation. Thus, we showed the possibility that 6.05-μm-light can predictably remove soft tissue without unexpected effects. A laser system with $\lambda=6.05$ μm is expected to be a novel cutaneous laser.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-03-15