The BS-EYL1 Er:YAG laser emits at wavelength of 2,940 nm at the peak absorption of water and resides in close proximity to a 3,030 nm absorption peak of collagen. It is therefore better absorbed better than the 10,600 nm wavelength of the CO2 laser. Tissue is disrupted and removed by direct ablation and the acoustic-mechanical sequelae of explosive vaporization of the tissue water. With such a small zone of thermal injury, minimum tissue desiccation occurs and each subsequent pass produces a very similar effect. This also means that there is no limitation to the depth of penetration that can be reached with an Er:YAG laser, and that is why there is much less down time for Er:YAG laser skin treatment.