CO2 Fractional Laser is a fractional carbon dioxide laser resurfacing system. The device works by emitting CO2 energy in the form of tiny beams. This energy reaches your face, where it can effectively penetrate the deeper layers of your skin. The neck, chest and hands are also commonly treated. When the light reaches the treatment area, it injures small areas of old, damaged skin. Then, your skin responds by creating new, vibrant cells. The heat of the treatment also helps to stimulate collagen production, an essential component of youthful skin.