2026-06-12 · Skin Resurfacing · Pmise Editorial Team
A fractional CO2 laser (10600nm) treats skin resurfacing, scars, and wrinkles by creating microscopic treatment zones (MTZs) that trigger collagen remodeling with less downtime than fully ablative lasers. For clinics, the key buying decisions center on the laser source type (RF-excited tube vs. glass tube), pulse duration control, and spot size options. The machine’s core value is its ability to deliver controlled ablation depth—typically 100-500 microns per pass—while leaving surrounding tissue intact for rapid healing.
The fractional CO2 laser emits light at 10600nm, a wavelength strongly absorbed by water in skin tissue. When the beam strikes the skin, it vaporizes columns of tissue called microscopic treatment zones (MTZs). Each MTZ is typically 100-200 microns in diameter, surrounded by untreated tissue that accelerates healing and collagen production.
This fractional approach—pioneered in the early 2000s—solves the main drawback of older fully ablative CO2 lasers: prolonged downtime and infection risk. Per manufacturer specifications, the ablation depth per pass ranges from 50 to 500 microns depending on energy settings (typically 10-50 mJ per MTZ) and the number of passes. The body’s wound-healing response then deposits new collagen for 3-6 months after treatment.
Clinically, the fractional CO2 laser is established for:
The laser source is the most consequential buying decision for a fractional CO2 machine. Two dominant technologies exist:
| Feature | RF-Excited Tube (Metal-Ceramic) | Glass Tube (DC-Excited) |
|---|---|---|
| Lifespan (hours) | Typically 8,000-12,000 | 2,000-4,000 |
| Beam quality | Consistent TEM00 mode | Degrades over tube life |
| Warm-up time | Instant or <1 minute | 3-5 minutes |
| Pulse stability | High, even at low energies | Drops at low pulse energies |
| Replacement cost | Higher upfront, lower per-hour | Lower upfront, higher per-hour |
RF-excited tubes (also called metal-ceramic lasers) use radiofrequency energy to excite the CO2 gas mixture. They deliver consistent pulse-to-pulse energy, require no warm-up, and maintain beam quality throughout their lifespan. For a clinic performing 10-20 fractional sessions per week, an RF tube can last 3-5 years before replacement.
Glass tubes (DC-excited) use a direct current discharge. They are cheaper initially but require more frequent replacement. The beam quality degrades as the glass electrodes erode, leading to uneven ablation patterns and inconsistent clinical outcomes. Many budget machines use glass tubes, but the total cost of ownership often favors RF tubes for high-volume clinics.
Pmise engineering documentation confirms that Pmise fractional CO2 lasers use RF-excited metal-ceramic tubes, with a typical lifespan exceeding 10,000 hours under normal operating conditions.
The CO2 laser’s thermal relaxation time (TRT) for skin is approximately 1-2 milliseconds. To minimize collateral damage, the pulse duration should be shorter than the TRT. Look for machines offering pulse widths from 0.1 ms to 10 ms, with the ability to adjust energy per MTZ from 5 mJ to 50 mJ. This range allows treatment of superficial lines (low energy, short pulse) and deep scars (higher energy, longer pulse).
Larger spot sizes (10-15 mm) treat faster but require higher power. Smaller spots (5-7 mm) allow precise sculpting around the eyes and lips. The scanner should support multiple patterns: square, circular, and randomized to reduce visible treatment lines. Density settings (typically 1-30% coverage) let you control how much skin is ablated per session.
A fractional CO2 laser generates significant heat. The handpiece should have a built-in cooling system—either forced air or a chilled tip—to protect the epidermis. Some machines also integrate a contact cooling plate that pre-cools the skin before each pulse.
IEC 60825-1 classifies CO2 lasers as Class 4 devices. The machine must include:
The fractional CO2 laser’s versatility makes it a core device in any medical aesthetics practice. Here are the primary indications with evidence-based context:
Acne scars—particularly rolling and boxcar types—respond to fractional CO2 because the laser vaporizes fibrotic tissue and stimulates neocollagenesis. A typical protocol involves 1-3 sessions at 4-6 week intervals. Per the device manual, energy settings of 20-40 mJ per MTZ at 10-15% density produce optimal results for moderate scarring. See the CO2 laser for acne scars guide for detailed protocols.
Perioral and periorbital rhytides respond well to fractional CO2. The laser’s ability to tighten collagen fibers (immediate effect) and stimulate new collagen (delayed effect) produces visible improvement after one session. Patients typically experience 5-7 days of erythema and edema, with full results at 3 months.
Fractional CO2 lasers with dedicated vaginal applicators (see Pmise vaginal applicator) treat vaginal atrophy, laxity, and stress urinary incontinence. The laser creates MTZs in the vaginal mucosa, stimulating collagen and elastin production. The FDA has cleared this indication, and the procedure takes 10-15 minutes with no downtime.
Hypertrophic and atrophic scars benefit from fractional CO2 treatment. The laser can be used alone or combined with subcision and microneedling. Energy settings of 30-50 mJ per MTZ at 5-10% density are typical for thicker scars.
Fractional CO2 treatment is an ablative procedure with specific safety requirements. The FDA classifies it as a prescription device, meaning it must be used by or under the supervision of a licensed medical professional. Key safety points:
Downtime varies by treatment depth. Superficial resurfacing (low energy, low density) results in 3-5 days of redness and peeling. Deep resurfacing (high energy, high density) can require 7-10 days of recovery, with erythema persisting for 2-4 weeks. The laser resurfacing aftercare checklist provides a complete protocol for clinics.
Post-treatment care includes:
Clinics evaluating a fractional CO2 purchase should understand how it compares to other resurfacing modalities:
| Technology | Ablation Depth | Downtime | Best For | Key Limitation |
|---|---|---|---|---|
| Fractional CO2 (10600nm) | 100-500 µm per pass | 5-10 days | Deep scars, wrinkles, vaginal | Darker skin types (IV-VI) risk hyperpigmentation |
| Er:YAG (2940nm) | 50-100 µm per pass | 3-5 days | Superficial resurfacing | Less collagen tightening |
| Non-ablative fractional (1550nm) | 0 µm (thermal only) | 1-2 days | Mild photoaging, melasma | Requires 3-5 sessions for visible results |
For clinics that treat a mix of scar patients and cosmetic resurfacing cases, the fractional CO2 laser offers the best balance of depth and downtime. The fractional CO2 vs Er:YAG comparison provides a detailed breakdown for buyers weighing these two ablative options.
What is the difference between RF-excited and glass tube fractional CO2 lasers?
RF-excited tubes offer longer lifespan (10,000+ hours) and more stable energy output, while glass tubes are cheaper to replace but have shorter life (2,000-5,000 hours). RF tubes also provide better pulse-to-pulse consistency, which is critical for uniform ablation depth and patient safety.
How deep can a fractional CO2 laser penetrate per pass?
Typical ablation depth ranges from 100 to 500 microns per pass, depending on energy settings and pulse duration. Deeper penetration (300-500 microns) is used for scar revision, while shallower passes (100-200 microns) are preferred for skin resurfacing and wrinkle treatment to minimize downtime.
What spot size options should I look for in a fractional CO2 laser?
Look for adjustable spot sizes from 100 to 300 microns. Smaller spots (100-150 microns) allow finer control for delicate areas like periorbital skin, while larger spots (200-300 microns) increase treatment speed for larger areas like the face or neck. Some machines offer variable density patterns for customizing coverage.
How does fractional CO2 laser downtime compare to fully ablative lasers?
Fractional CO2 lasers have significantly less downtime—typically 3-7 days of redness and swelling versus 2-4 weeks for fully ablative. The microscopic treatment zones leave surrounding tissue intact, promoting faster healing. Patients can usually return to work after 5-7 days with proper sun protection and skincare.