Fractional vs ablative CO₂: what the difference means for your practice

Every 10,600 nm CO₂ laser works on the same principle: the beam is strongly absorbed by water in tissue, so its energy becomes heat exactly where it lands. What separates one treatment from another is how that energy is distributed across the skin. That is the real meaning of “fractional” and “ablative” — and the reason a buyer should care which one a platform can deliver.

The shared mechanism

When CO₂ energy is delivered fast enough, tissue water flashes to vapour and a micro-volume of tissue is removed. That is ablation. Heat spreading sideways and downward from the ablated zone denatures protein and seals small vessels. That is coagulation — the residual thermal effect that drives collagen remodeling.

Every CO₂ pass is a blend of the two. Power, dwell time, density, depth and number of passes decide the balance. Fractional and ablative delivery are two different ways of distributing that blend.

Fractional delivery

A fractional scanner places a grid of microscopic treatment columns across the area and leaves the skin between them intact. Those untreated islands act as healing reservoirs, so the skin re-epithelializes from the sides of each column rather than from the bottom of a continuous wound.

For a clinic, that means:

• Adjustable intensity. Density (how many columns) and depth (how far they reach) can be dialed from a light refresh to deeper remodeling.
• Planned recovery. Lighter fractional work is generally associated with a few days of redness; deeper fractional work with a longer, consented recovery.
• Series-based programs. Patients who cannot take a long recovery can be treated more conservatively across several sessions.

Fractional CO₂ is the core aesthetic mode for texture, fine lines, photoaging, enlarged pores and acne-scar remodeling.

Ablative (full-field) delivery

Ablative resurfacing removes a continuous layer of tissue across the treated area. It is the more intensive end of the spectrum: deeper correction, the longest recovery and the most careful patient selection.

The same physics, focused or defocused through a handpiece, also underpins CO₂ soft-tissue work — controlled vaporization, excision and coagulation of selected benign lesions, after appropriate diagnosis and within the provider’s scope.

Side by side

	Fractional	Ablative (full-field)
What is treated	A grid of micro-columns; skin between them left intact	A continuous layer across the area
Recovery posture	Shorter; often staged across a series	Longest; most careful selection
Typical aesthetic use	Texture, lines, photoaging, pores, acne scars	Deeper resurfacing, focal ablative work
Main dials	Density and depth	Depth, passes and endpoint

Why buy a platform that does both

A fractional-only device locks a practice into one intensity band. A platform with both fractional and ablative capability lets the clinician choose the right intensity for each patient — and lets the practice offer corrective treatments, lighter maintenance series and procedural soft-tissue work from one capital purchase.

That is the logic behind the Shallow, Deep and Hybrid strategies we describe for Alexa CO₂ Aesthetic: surface-focused fractional work, deeper fractional remodeling, or a plan that combines both — all set through depth and density, not separate machines.

Skin type still governs the plan

Although the target chromophore is water, ablative injury triggers inflammation, and in skin with more melanin that raises the risk of post-inflammatory hyperpigmentation. Ablative CO₂ is therefore planned most conservatively as Fitzpatrick type rises, and pigmentary changes can appear days or weeks after treatment. Training on skin-type planning is part of a responsible CO₂ purchase — see our training program.

Questions to ask a vendor

1. Does the platform deliver both fractional and ablative treatment, and through what delivery system?
2. What scan field and scan shapes does the scanner support?
3. Which depth and density controls does the operator have — and how are they taught?
4. What training, protocol support and service are included in the price?
5. Is the device licensed by Health Canada, and can you verify the licence number?

For a full checklist, read the professional CO₂ laser buyer’s guide.