To analyze quantitatively the heat effect of laser and bio-tissue by using available model is propitious to estimate clinic
effect and optimize laser parameter. The most researches for the heat interaction were limited on temperature distributing
without mass flow process, and few researches on heat interaction with high-power pulse laser.
The finity difference method was used to simulate the distributing of light, heat source, temperature fields and vaporizing
depth along with time. The relations of temperature rise, vaporizing efficiency versus power density, irradiation time,
pulse width, repeat frequency, were analyzed theoretically. The simulation results were compared with experiment and
indicated that the absorption coefficient of tissue influences greatly aggradation of laser energy, heat transfer and
vaporizing on tissue surface. The highest temperature point locates on tissue surfaces, and change of temperature field is
induced by the different cooling condition on surface. The theoretical model is reasonable and may give some references
to the laser bio-tissue vaporization.
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