Theoretical and Experimental Study of the Hair Bonding by Continuous Laser Radiation with a Wavelength of 980 nm
Paper #8949 received 3 Apr 2023; accepted for publication 14 Jun 2023; published online 28 Jun 2023.
The possibility of hair bonding by continuous laser radiation with a wavelength of 980 nm has been studied. A computer optical model of a laser system for bonding of human hair has been created. Using the Monte Carlo method, the distribution of the power of the absorbed laser radiation in the contact area of two hairs during their laser irradiation was obtained. The power distribution of the absorbed laser radiation obtained in the optical model is used in a computer thermophysical model of the laser bonding of human hair, the calculation in which is carried out by the finite element method. The maximum values of the temperature and the Arrhenius function of a pair of hairs in the area of their contact are calculated for different laser radiation power (1–10 W) and scanning speed of the laser beam along the area of hair contact (1–10 mm/s). It is shown that the temperature slowly decreases with increasing scanning speed, at the same time the Arrhenius function demonstrates a sharp decrease, while the values of both the temperature and the Arrhenius function increase with increasing laser radiation power. The power of laser radiation and the scanning speed at which the temperature of hair denaturation is reached, and the value of the Arrhenius function becomes equal to one were determined. Assuming that for the bonding of hair it is necessary that the temperature in the irradiation area exceeds the temperature of hair denaturation, and the Arrhenius function is less than one, the region of optimal laser radiation powers and scanning speeds is determined. In an in vitro experiment, the possibility of hair bonding by radiation from a continuous diode laser with a wavelength of 980 nm was studied and the validity of the optimal parameters of laser exposure selected at the stage of theoretical research was demonstrated. The results of the study can be used to develop a device for laser hair extension.
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