Er:YAG laser source is used in aesthetics and dermatology for soft tissue resurfacing. During multiple consecutive pulses, the skin's epidermis is heavily heated, therefore it is essential not to exceed the damage and pain threshold. We designed and implemented an experimental system that allows simultaneous heating of tissue with Er:YAG laser source and water spray cooling. We demonstrated that using a patterned laser beam increases radial heat dissipation, which accelerates the cooling process. We compared the effects of the laser source on living and non-living biological tissue and demonstrated that the laser source only works in the skin's epidermis and has a similar impact on both living and non-living tissue. Additionally, we demonstrated that by using the developed experimental system, we can achieve high peak temperatures without simultaneously increasing the basal surface temperature.
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