This fractional laser comparison lines up the three resurfacing wavelengths clinics ask about most: ablative CO2 at 10600nm, ablative Er:YAG at 2940nm, and non-ablative 1550nm. The short answer: CO2 gives the deepest remodeling with the longest recovery, Er:YAG ablates precisely with less heat spread, and 1550nm trades some intensity for the shortest downtime. Which one belongs in your catalog depends on your patients' concerns and the terms you can support.
Why wavelength decides how a fractional laser behaves
Every fractional laser places an array of microscopic treatment zones (MTZ) of thermal injury into the skin while leaving the surrounding tissue intact, which speeds healing and triggers collagen remodeling. This principle, fractional photothermolysis, was first described by Manstein and colleagues in Lasers in Surgery and Medicine in 2004, using a 1.5 micron (1550nm) prototype. What changes between devices is how strongly the beam is absorbed by water, the main target chromophore for all three wavelengths, and absorption strength sets ablation depth, heat footprint, and recovery time.
Where each wavelength sits on the water absorption curve explains the ranking. Er:YAG at 2940nm sits almost exactly on the water absorption peak near 3 microns, so its energy is absorbed very strongly at the surface. Clinical laser-dermatology references put Er:YAG water absorption at roughly 10 to 16 times that of CO2: a review from Shatkin Dental & Facial (drshatkin.com) cites 10 to 15 times greater absorption than the 10600nm CO2 laser, and the ScienceDirect Er:YAG overview cites a coefficient about 16 times higher. CO2 at 10600nm is also strongly absorbed but leaves a broader zone of thermal coagulation. The 1550nm beam is absorbed more moderately, heating micro-columns into the dermis without vaporizing the surface, which is why it is non-ablative.
Rule of thumb: the closer a wavelength sits to a water peak, the more its energy stays at the surface, giving cleaner ablation and less deep heat. Weaker absorption means deeper, gentler heating and less downtime.
CO2 fractional laser (10600nm): the ablative workhorse
A co2 fractional laser is the most aggressive of the three and the reference standard for deep resurfacing. At 10600nm the beam vaporizes tissue while leaving a controlled zone of residual thermal heating around each micro-column, and that heat is what tightens and rebuilds collagen. An in-vivo comparison study on PubMed Central (PMC3229937) that treated patients with both a 10600nm CO2 and a 1550nm fractional system is careful about what it can and cannot show: the authors state that for ethical reasons they did not take skin biopsies, so they report no collagen or elastin histology of their own. Drawing on earlier histologic work, that paper describes CO2 healing through a broader zone of coagulation associated with wound-healing substances such as heat shock protein, procollagen and dermal elastin, while the 1550nm device heals mainly through keratinocyte reformation. This is a described difference in healing mechanism, not a measurement showing CO2 out-signals 1550nm. Pmise CO2 systems use a sealed radio-frequency (RF) excited CO2 tube, which per Pmise device documentation is more stable and longer-lived than a sealed glass tube, and run multiple output modes (continuous, ultra-pulse, and fractional). By changing the lens and energy, a physician can shift from shallow rejuvenation to deep peeling, which is why CO2 covers the widest indication list.
- Atrophic and surgical scars, including acne scarring
- Deeper wrinkles and photoaged, lax skin
- Stretch marks and skin texture reconstruction
- Certain benign lesions such as warts and nevi
The cost is recovery. Ablative CO2 typically produces the longest social downtime, usually several days of redness, oozing and crusting, and it carries a higher risk of post-inflammatory hyperpigmentation in darker skin types, so operator training matters. See the UltraPulse CO2 fractional laser (10600nm) page for configuration options, and our ablative skin reconstruction solution for the clinical workflow.
Er:YAG laser (2940nm): precise ablation with less thermal spread
An er:yag laser sits on the water absorption peak, so it removes tissue very precisely with minimal heat left behind. Because its water absorption is roughly an order of magnitude higher than CO2 (10 to 16 times, per the drshatkin.com and ScienceDirect references above), its energy is spent at the surface and penetration is more superficial. In practice that means a shorter recovery than CO2 for a similar depth of surface removal, but also less of the collagen-tightening residual heat that CO2 delivers.
The Pmise Er:YAG handpiece swaps between a focusing tip and a fractional (pixel) tip, so it can work as a full-field peel or a fractional treatment depending on the tip fitted.
Typical Er:YAG indications include:
- Photoaging and rough, uneven skin texture
- Epidermal pigmented lesions
- Fine to moderate wrinkles
- Scars and removal of superficial benign skin growths
1550nm fractional (non-ablative): resurfacing with minimal downtime
The 1550nm fractional laser is the gentlest of the three because it does not vaporize the surface. It uses an erbium-doped (Er:glass) fiber source to create microscopic thermal columns, roughly 100 microns across in the original Manstein work, that reach into the dermis while the outer skin barrier stays largely intact. In the same in-vivo comparison study (PMC3229937), a 1550nm system was delivered at a treatment depth of about 980 microns, that is, well under a millimeter, targeting water in the dermis to switch on the wound-healing and collagen-remodeling cascade while sparing the stratum corneum. That figure is the device treatment parameter reported by the authors, who note they did not biopsy the treated skin, so it is not a measured histologic depth.
Because there is no open ablation, downtime is minimal. Patients generally see redness and mild swelling that settle quickly rather than the days of crusting seen with ablative devices. The trade-off is that non-ablative treatment usually needs a series of sessions to reach a result a single aggressive CO2 pass might give.
- Photoaging, fine lines and early wrinkles
- Acne scars and atrophic scarring
- Enlarged pores and mild skin laxity
- Stretch marks and overall texture improvement
Because it is gentler on the epidermis, 1550nm is often positioned as suited to a wide range of skin tones. Details are on the Erbium glass fractional laser (1550nm) page, and the treatment logic is covered in our non-ablative skin resurfacing solution.
Downtime vs result: the trade-off at a glance
The core decision is how much recovery time buys how much result. Treat the ranges below as dependent on settings and operator technique, not fixed guarantees.
| Attribute | CO2 (10600nm) | Er:YAG (2940nm) | 1550nm |
|---|---|---|---|
| Type | Ablative | Ablative | Non-ablative |
| Water absorption | Strong | Strongest (at peak) | Moderate |
| Residual heat / tightening | Highest | Low to moderate | Moderate (contained columns) |
| Best for | Deep scars, deep wrinkles, laxity | Texture, pigment, fine wrinkles | Fine lines, early aging, maintenance |
| Relative result per session | Highest | Moderate to high | Gradual, over a series |
| Relative downtime | Longest | Shorter than CO2 | Shortest |
| Typical sessions | Fewer | Few | Several |
How to choose the right platform for your patients
For distributors and clinic owners, wavelength should follow the patient base. Work through these questions:
- What do your patients actually ask for? Heavy scar and wrinkle correction points to CO2; texture and pigment refinement points to Er:YAG; low-commitment maintenance points to 1550nm.
- How much downtime will they accept? Working professionals who cannot disappear for a week favor 1550nm or Er:YAG.
- What skin types do you serve? Higher-melanin populations need cautious energy settings; non-ablative and precise Er:YAG protocols can be easier to manage safely, though training is essential in every case.
- One device or a menu? Many clinics pair an ablative platform with a non-ablative one to cover both ends of the downtime spectrum; a multi-mode CO2 gives the most depth range, while 1550nm is the easiest to sell into a busy clinic.
What buyers should verify before ordering
Clinical fit is only half the purchase. Confirm the commercial and compliance details that decide whether a device is resellable and serviceable in your market.
- Certifications and compliance: Demand a CE mark for European sale, ISO 13485 certification for the factory, and any national clearance your regulator requires (for example FDA 510(k) status). Ask for actual certificate numbers and scope, not just a logo.
- MOQ and lead time: Confirm the minimum order quantity, whether single-unit sample orders are accepted, and realistic production plus shipping lead time.
- Warranty, after-sales and spare parts: Check the warranty on the laser source and handpieces, availability of consumables and spare tips, expected source lifetime, and how support is handled across time zones.
- Price positioning: the three platforms sit at different price points; match the platform to the margin and after-sales load you can support, not just the headline cost.
Pmise supplies compliance documentation and spec sheets on request. The next step is simple: request a quote and full spec sheet, name your target market so we can confirm the right certification package, and ask for a sample or demo before scaling the order.
Frequently Asked Questions
Is CO2 or Er:YAG better for acne scars?
Both treat acne scars, but they suit different depths. CO2 delivers deeper ablation plus collagen-tightening heat, which tends to work well for deeper, established atrophic scars, at the cost of longer downtime. Er:YAG ablates more precisely with less residual heat, a good fit for shallower scarring or patients who need faster recovery. Many clinics keep both and pick per case.
Does the 1550nm fractional laser really have no downtime?
It has far less downtime than ablative lasers because it does not vaporize the skin surface, and it is often marketed as a lunchtime procedure. In practice most patients still see redness and mild swelling that resolve quickly. The realistic trade-off is minimal downtime in exchange for needing several sessions to match what an ablative device produces in fewer passes.
Why does Er:YAG cause less thermal damage than CO2?
Er:YAG runs at 2940nm, on the water absorption peak, so its energy is absorbed very strongly at the surface, roughly 10 to 16 times more than CO2 per laser-dermatology references, and little heat spreads deeper. CO2 at 10600nm is also well absorbed but leaves a wider zone of residual heat around each column. That heat is useful for tightening, but it is also why CO2 usually means a longer recovery.
What should I confirm with the supplier before I buy?
Ask for the CE and ISO 13485 certificates and any national clearance your market requires, the minimum order quantity and lead time, the warranty term on the laser source and handpieces, and spare-parts and technical-support arrangements. Then request a spec sheet and a quote for your target configuration, and, where possible, a sample or demo before committing to a larger order.
Written by the Pmise Technical Team. Pmise manufactures laser and light-based aesthetic systems, including CO2, Er:YAG and 1550nm fractional platforms. This guidance draws on Pmise device documentation and the laser-dermatology sources cited above. Verify treatment protocols and safety settings with a qualified physician.
