There are two types of YAG lasers.Â
Er:YAG lasers (aka erbium lasers) are resurfacing devices that have a range of applications. They can treat fine lines and wrinkles, acne scars, surgical scars, skin laxity, and pigmentation irregularities like brown spots.Â
The Er:YAG is an ablative laser, so you can expect an intense session that removes the surface layer of your skin, to reveal fresh skin and stimulate a healing response. “The erbium YAG laser delivers wavelengths of laser light into the dermal layers, to eliminate damaged tissue and smooth away wrinkles and other signs of skin damage,” explains San Diego dermatologist Dr. Kimberly Butterwick. “The laser energy is absorbed by water in your skin cells, so it can transform the condition of your skin at a cellular level.” The heat generated by the laser results in collagen shrinkage and stimulates the formation of new collagen, which further tightens the skin over time.Â
One advantage of the erbium laser is that, due to its high affinity for water, it can specifically target—and precisely remove—the tissue you’re treating, with minimal damage to the surrounding skin. The new skin cells that form during healing give skin a tighter, younger-looking surface. “This is an intense treatment, designed to produce dramatic rejuvenation effects,” says Dr. Butterwick.
Neodymium:YAG lasers (commonly called Nd:YAG) are non-ablative, meaning the top surface of your skin is left intact while the laser heats only the lower layer. Like erbium lasers, they’re versatile and used to treat a variety of concerns, including the following.
- Vascular lesions: Larger vessels or visible spider veins that aren’t treated with sclerotherapy injections can be treated with YAG lasers, says Dr. Harold Kaplan, a facial plastic surgeon in Torrance, California.
- Pigment irregularities: “There are a number of lasers that we currently use for the treatment of hyperpigmentation, or dark spots. Certainly, the Nd:YAG is one of them. Although it’s not for everyone, it does work for a large majority of our patients,” says NYC dermatologist Dr. Bobby Buka.
- Hair removal: Many doctors on RealSelf say the Nd:YAG laser is their go-to laser for patients with highly pigmented skin. Just don’t expect miracles—laser hair removal is rarely permanent. “The best you can expect from laser hair removal treatments is for 70% of the hairs to be totally removed,” says Las Vegas dermatologist Dr. Victor Rueckl. “The remaining hairs should be finer.”
- Tattoo removal: Lasers deliver high-intensity energy into the outer layer of skin, to break up the pigment into smaller ink particles that the body metabolizes.Â
- Skin rejuvenation: While newer lasers have become more popular for skin resurfacing, the Nd:YAG laser can gently treat the skin, in a non-ablative manner (not removing the top layer), to stimulate collagen production and improve the appearance of wrinkles and fine lines.
Nd:YAG lasers can be used in three modes: Q-switched, long pulse, or picosecond. Q-switched lasers produce extremely short bursts of energy, which translates into massive amounts of power. When it comes to tattoo removal, this peak power helps break up the most stubborn ink color—with the exception of green, which is more effectively handled in picosecond mode—without harming surrounding skin. This reduces discomfort, side effects, and downtime.
Q-switched lasers are also used to treat pigmented lesions, like brown spots (they target dark concentrations of melanin and fracture it into tiny pieces that are carried away by the immune system or peeled off the skin’s surface) and vascular lesions, like broken capillaries (the laser’s light energy heats up the vessels, causing them to swell and be destroyed).
In long-pulsed mode (meaning the amount of time targeted tissue is exposed to laser energy), Nd:YAG lasers are widely used for hair removal in patients with dark skin, particularly those whose hair is very coarse and dark. They’re considered “pigment-friendly,” so they’re the most effective and safest way to remove unwanted hair in these patients without causing side effects like scarring, burning, and discoloration. Dr. Kaplan says it’s the only laser he typically recommends for patients with Fitzpatrick skin type V or VI (the deepest skin tones). Â
For light skin tones, as well as medium or fine hair, Nd:YAG lasers are considered to be less efficient at targeting hair follicles. Prior to treatment, your laser provider should do a test spot, to see how you respond, before proceeding with the full treatment, says Dr. Amy Paul, a dermatologist in Grand Junction, Colorado.Â
In picosecond mode, the Nd:YAG laser has an even higher peak power than the Q-switched [setting] and breaks up tattoo particles more rapidly and effectively, explains Dr. Emil Tanghetti, a dermatologist in Sacramento, California. With modifications, this mode can also deliver mild resurfacing. “When used with a fractional optic, [a lens] which splits the beam into small, even higher-power energy zones, the device causes localized areas of plasma formation in the skin and superficial dermis. “These small zones stimulate a repair response which can stimulate the production of new collagen and elastic tissue as well as eliminating unwanted pigmentation.”
Related: Your Guide to Safe and Effective Hair Removal Lasers for Fair, Medium, and Deep Skin Tones
RealSelf Tip: While a YAG laser may be an option to treat a particular concern, it may not necessarily be the best option. For instance, while an Nd:YAG laser can treat some vascular birthmarks, in many practices, pulsed-dye lasers are considered the gold standard for this concern. “It’s important to choose a practice that has the correct technology, pursues best practices, has experience with your concern, and tailors the treatment plan based upon the condition as it changes throughout the treatment plan,” says Dr. Kaplan.