A CO2 laser is a gas-powered laser that produces an invisible beam of infrared light at a wavelength of 10.6 micrometers. It is one of the most powerful and versatile laser types in existence, used across medicine, manufacturing, and cosmetic dermatology. Its ability to precisely vaporize, cut, and heat tissue or materials makes it valuable in contexts ranging from facial resurfacing to industrial engraving.
How a CO2 Laser Works
Inside the laser tube sits a mixture of three gases: carbon dioxide, nitrogen, and helium. An electrical current excites the nitrogen molecules, which transfer their energy to the CO2 molecules. When those CO2 molecules release that energy, they emit photons of infrared light at a wavelength between 9 and 11 micrometers, with 10.6 micrometers being the dominant output because it has the highest energy gain. Helium helps cool the gas mixture and keeps the process stable.
That 10.6-micrometer wavelength is key to the laser’s usefulness. Water absorbs infrared light at this wavelength extremely well, and since human tissue and many organic materials contain water, the CO2 laser can vaporize them with precision. The beam can be focused to a tiny spot, giving operators fine control over exactly how deep and wide the laser cuts or ablates. CO2 lasers can produce continuous wave powers exceeding 100 kilowatts and pulsed energies up to 10 kilojoules, making them among the most powerful lasers available.
Medical and Surgical Uses
CO2 lasers were originally used as surgical cutting tools, operating in a continuous wave mode that ablated tissue to a depth of 400 to 500 micrometers. That’s deep enough to slice through soft tissue cleanly while simultaneously sealing small blood vessels, which reduces bleeding during surgery. The FDA has cleared CO2 laser systems for soft tissue ablation, vaporization, excision, incision, and coagulation across a wide range of specialties.
In ear, nose, and throat surgery, CO2 lasers treat conditions like vocal cord lesions, nasal obstructions, and growths in the airway. Gynecologists use them to treat precancerous cervical changes and genital warts. Podiatrists remove ingrown nail tissue and warts. Dentists use them for gum reshaping and removing mouth lesions. General surgeons use them on cysts, abscesses, and hemorrhoids. In each case, the laser’s precision and ability to seal tissue as it cuts are the core advantages over a traditional scalpel.
Skin Resurfacing: Ablative vs. Fractional
The cosmetic application most people encounter when searching for CO2 lasers is skin resurfacing. This is where the laser removes damaged outer layers of skin and heats the tissue underneath, triggering a wound-healing response that remodels collagen and tightens the skin. There are two main approaches.
Traditional (fully ablative) resurfacing removes the entire surface of the treated area. It produces dramatic results but comes with longer downtime and higher risk. Modern high-energy pulsed CO2 lasers improved on earlier continuous-wave devices by ablating tissue at a shallower depth of 20 to 100 micrometers per pass, which limits thermal injury to deeper layers.
Fractional CO2 resurfacing changed the game further. Instead of treating the entire surface, the laser creates thousands of microscopic columns of treated tissue, leaving healthy skin between them. This allows the body to heal faster because the untouched skin serves as a scaffold for repair. Fractional delivery can actually reach deeper into the lower dermis without the scarring risk that comes with fully ablative treatment at the same depth. The tradeoff is that fractional treatment typically requires multiple sessions for the same level of improvement.
What CO2 Lasers Treat on the Skin
The thermal injury beneath the ablated zone is what makes CO2 lasers effective for so many skin concerns. Heat causes collagen fibers to contract immediately, producing visible skin tightening. Over the following weeks and months, the body generates new collagen in the treated area, a process called neocollagenesis. This ongoing remodeling is responsible for the continued improvement patients see for months after treatment.
Blinded studies have demonstrated significant improvement in forehead lines, crow’s feet, and lines around the mouth following CO2 laser treatment. The laser also reduces acne scarring by inducing thermal damage below the scar tissue and stimulating fresh collagen production to fill in the depressions. Beyond wrinkles and scars, CO2 lasers treat sun spots, precancerous skin growths, enlarged oil glands, benign skin tumors, and thickened, bumpy nose skin (rhinophyma).
Recovery After Treatment
Immediately after a CO2 laser session, the treated skin is cooled and coated with a thick healing ointment. The first week to ten days involve redness, pinpoint oozing, and a bronzed appearance as the treated layer dries and peels away. Keeping the skin continuously covered with petroleum jelly or a silicone-based ointment during this phase prevents crusting and supports healthy healing.
Most people feel comfortable with video calls by day five and can return to in-person work, with makeup, by the end of the first week. Pinkness in the treated area can linger for several weeks after the surface has healed. Full results develop gradually as new collagen continues to build over the following three to six months.
Risks and Skin Tone Considerations
The most discussed risk of CO2 laser resurfacing is pigment change. People who tan easily or have darker skin tones are more likely to develop temporary darkening (hyperpigmentation) after treatment. Older-generation fully ablative CO2 lasers caused permanent lightening of the skin in up to 19% of cases. Fractional technology has made this much less common, though it’s still possible if treatment is too aggressive.
A history of poor wound healing, keloid scarring, or a compromised immune system also increases risk. People with extensive sun damage across their face may need full-face treatment rather than spot treatment to avoid noticeable color mismatches between treated and untreated skin. These factors are typically evaluated during an initial consultation. The average cost of a laser skin resurfacing session is $1,829, according to the American Society of Plastic Surgeons, though price varies significantly based on the size of the treatment area and whether full ablative or fractional technology is used.
Industrial and Manufacturing Uses
Outside of medicine, CO2 lasers are workhorses in manufacturing and fabrication. The same properties that make them effective on tissue, strong absorption by organic materials, make them ideal for cutting and engraving wood, paper, cardboard, cork, acrylic, rubber, and many plastics. Acrylic cuts especially well, leaving a polished, glass-like edge. Softwoods like balsa and aspen cut easily at thicknesses under a quarter inch, while plywood with interior-grade glue (like Baltic birch) is also laser-friendly.
CO2 lasers can etch designs into materials they can’t cut through. Flat glass, marble, granite, soapstone, and onyx all produce a white textured appearance when etched. Thin films like Mylar work well for cutting at thicknesses of an eighth of an inch or less, though thicker sheets tend to warp and bubble. The one major limitation: CO2 lasers are not efficient at cutting bare metals. Metal cutting in industrial settings typically uses fiber lasers, which operate at a shorter wavelength that metals absorb more readily. CO2 lasers can mark anodized aluminum and stainless steel surfaces, but cutting through metal stock is not their strength.