Fractional CO2 laser is a type of laser that relies on carbon dioxide (CO2) gas to produce laser energy with a wavelength of up to 10,600 nanometers in the infrared spectrum. These rays penetrate the upper layers of the skin to the dermis, providing a dual therapeutic effect: stimulating collagen production in the inner layer and exfoliating the surface layer, which promotes the growth of new, tighter, healthier skin.