Introduction
Picosecond and nanosecond lasers both treat tattoos and pigment in aesthetic practices. Their pulse durations change how energy meets tissue, and that choice affects patient selection, downtime, training, and operating costs.
Per NIST's prefix table, 1 ns equals 10^-9 seconds and 1 ps equals 10^-12 seconds, so 1 ns = 1,000 ps. That conversion says nothing about clinical results.
This guide compares the technology, applications, specifications, and ownership considerations without naming one best system for every clinic. Clinic owners get a framework for matching a platform to their own patient mix.
Key Takeaways
- Picosecond pulses are far shorter, but pulse duration alone doesn't predict results.
- Pico suits complex pigment, tattoo, and scar work; nano still fits routine indications.
- Judge wavelengths, energy, spot size, cooling, and handpieces next to pulse width.
- Utilization, budget, and service support should drive the purchase.
Picosecond vs Nanosecond Lasers: Quick Comparison
| Dimension | Nanosecond | Picosecond |
|---|---|---|
| Pulse duration | Billionths of a second | Trillionths of a second |
| Mechanism | Photothermal and photomechanical | Greater photoacoustic emphasis; heat still present |
| Typical scope | Dark and light tattoo ink, pigment, some resurfacing, by device | Tattoo, pigment, acne scars, wrinkles, by device and handpiece |
| Ownership | Mature platforms; pricing varies | Higher complexity; accessories, training, service |
| Evidence check | 510(k), peer-reviewed data | 510(k), peer-reviewed data |
Two cautions apply. "Picosecond" describes pulse width, not a whole device. And FDA clearance attaches to a specific model, wavelength, and handpiece, so verify it at that level.
Shorter pulses can raise peak power at the same energy, but shorter isn't automatically better clinically. Some systems marketed as picosecond run near 900 ps, which is a different class from sub-500 ps devices. Neither category should be assumed safer, cheaper, or easier to run without evidence.
What Is a Picosecond Laser?
Dermatologic picosecond pulses run shorter than 1 ns. The label describes how long each pulse lasts, not a standardized configuration. Examples from FDA records and manufacturer specs:
- PicoWay: roughly 339 ps at 1064 nm and 294 ps at 532 nm
- PicoPlus: 450 ps and 2 ns modes
- PiQo4: about 500 ps via pulse slicing
How the energy works
A very short pulse can outrun heat diffusion. Stress confinement then favors mechanical disruption of pigment, though photothermal effects remain. Fluence, spot size, wavelength, repetition rate, and technique all shape the outcome.
Fractional lens-array handpieces work differently. Concentrated microspots can create optical breakdown and shock waves tied to remodeling, along with localized heat. That's a separate mode from full-beam pigment treatment.
What to compare between platforms
- Wavelengths (532/1064 nm core; 670, 730, 755, 785 nm on some)
- Pulse energy, spot sizes, and repetition rate (often up to 10 Hz)
- Handpieces, cooling, ergonomics, and electrical needs (PicoWay needs dedicated 200-240 VAC)
- Service, warranty, and training terms
Don't assume every pico system supports every indication. A 510(k) shows substantial equivalence to a predicate, not superiority. Cleared use and marketing language are different things.
Use Cases of Picosecond Lasers
Cleared indications depend on wavelength, handpiece, and skin type:
| Device | Documented labeling |
|---|---|
| PicoSure (K261570) | 755 nm tattoos and benign pigment; Focus Array scars/wrinkles, Fitzpatrick I-IV |
| PicoWay Resolve (K162454) | 1064 nm acne scars, Fitzpatrick II-V |
| enlighten III (K182997) | 1064/532/670 nm pigment and tattoos; Micro Lens Array acne scars, II-V |
| PicoLO (K203491) | Acne scars II-V; wrinkles I-IV |
Where pico fits
- Tattoo clinics with multicolor ink needing several wavelengths
- Practices treating melasma, nevus of Ota, or other benign pigment
- Dermatology and plastic surgery practices adding scar and texture work
Patient selection matters most. Complex pigment, a need for broader wavelengths, or demand for premium technology can justify pico. Nothing in device labeling promises fewer sessions or guaranteed results.
Evidence example
The PicoWay pivotal study (36 subjects) found 94% of treated areas improved after 3-4 treatments, judged by blinded photo identification. That isn't 94% scar clearance.
A 2023 meta-analysis of seven studies found no significant efficacy edge over other fractional lasers, with lower PIH and pain but more temporary pinpoint bleeding.
Limits to weigh
Capital cost, service availability, and operator learning curve all count. New-system estimates range from about $60,000 (Aesthetika PicoTech) to $150,000-$325,000 for name-brand platforms, depending on configuration and source.
Exact pricing requires a quote. A narrow treatment mix can leave a pico underused.
What Is a Nanosecond Laser?
A nanosecond laser delivers pulses measured in billionths of a second. It has long anchored Q-switched aesthetic care. RevLite's FDA record, for example, describes a Q-switched Nd:YAG at 1064/532 nm with nanosecond pulses.
Interaction is thermal and mechanical. Heat diffuses during the pulse, so settings, target absorption, cooling, and skin characteristics all affect response and side effects.
One terminology note: Q-switched does not always mean nanosecond. FDA describes PiQo4 as Q-switched with a pulse-slicing module delivering 500 ps pulses.
Strengths
- Familiar protocols and long clinical history
- Established tattoo and pigment indications
- Often lower acquisition and ownership cost; confirm with a current quote
Specs that matter beyond pulse width
- 1064 and 532 nm availability, plus dye handpieces on some units
- Pulse energy (PiQo4 nano mode reaches 2,000 mJ at 1064 nm)
- Spot sizes, fluence range, repetition rate, and cooling
- Maintenance needs and treatment-room workflow
Limitations
- May suit complex pigments or resurfacing goals less well than picosecond systems
- Thermal effects demand careful settings and patient selection
- Older units may lack current support, documentation, or ergonomics
Use Cases of Nanosecond Lasers
RevLite's 2014 labeling covers dark-ink tattoos and dermal pigment at 1064 nm, lighter inks and epidermal pigment at 532 nm, and resurfacing for acne scars and wrinkles. Those are device-specific indications, not blanket Q-switched clearance.
Pastelle Pro (K241527) lists 1064 nm for dark inks and 532 nm for lighter inks.
When nano fits the operating model
- Practices built on routine indications and familiar protocols
- High volumes of straightforward cases
- Lower upfront investment
Evidence example
In a 2020 comparison of 11 Asian patients with 37 tattoos, PicoWay outperformed AlexTriVantage on black tattoos at 1064 nm. PIH in tattoos was 35.1% (nano) versus 24.3% (pico) at 532 nm.
Small study, limited generalizability. It shows the nanosecond comparator still produced results.
Buyer caution on pre-owned units
FDA distinguishes servicing from remanufacturing, and the actual work, not the seller's label, decides which applies. Before buying used, check:
- Service history and calibration records
- Handpiece condition and replacement-part availability
- Software support
- Current regulatory documentation
Picosecond vs Nanosecond Lasers: What Is Better?
Neither wins universally. A 2025 meta-analysis of 971 patients found comparable endogenous-pigment clearance (RR 1.06, CI 0.85–1.31) and a borderline exogenous advantage for pico (RR 1.39, CI 0.99–1.94).
Pico showed less pain and lower PIH rates, with the strongest safety data in Asian cohorts.
Decision framework
Weigh your treatment menu, skin-type mix, pigment complexity, downtime tolerance, clinician expertise, wavelength needs, and expected utilization.
- Choose pico for complex pigment, specialized wavelengths, or differentiated rejuvenation when platform-specific clearance and evidence support it
- Choose nano for routine indications, a tight budget, familiar workflows, and outcomes your wavelengths can deliver
- Consider both only after modeling utilization, staffing, training, room capacity, and underuse risk
Several systems blur the line. PicoPlus and enlighten III offer both pico and 2 ns modes in one unit, which may suit practices wanting flexibility.
Procurement checklist
- Total cost of ownership, including financing and consumables
- Warranty terms and service response (one year is typical for major brands; PicoTech's package lists two)
- Training, uptime, and replacement components
- Electrical and safety infrastructure
- Resale value and insurance
- A treatment demonstration or sample protocol
Acquisition price isn't total cost. One illustrative model showed a 5-year TCO of $262,000, or 13 monthly treatments to cover annual ownership cost. Treat that as an example, not a projection.
Pico Laser Buyer's Guide offers a manufacturer-backed comparison library covering 16 platforms, with specifications, source documents, and 510(k) information. Use it as independent research, not a sales pitch.
Real-World Examples and Case Studies
Solar lentigines, split-face trial
A randomized trial of 20 women with Fitzpatrick III-V skin compared a 450 ps Picocare against a 10 ns Pastelle, both at 532 nm, split-face.
- Mean improvement score at 12 weeks: 2.95 vs 1.80 favoring pico (P<0.05)
- PIH: 5% vs 30% (pico vs nano), not statistically significant (P=0.057)
- Pain and satisfaction did not differ significantly
Limits: small sample, clinical diagnosis without biopsy, and possibly uneven lesion distribution. The trial used an original Pastelle, not the newer Pastelle Pro, and does not establish a new US-cleared indication.
Takeaway
For pigment-focused practices weighing a premium device, clearance, tolerability, and PIH risk did not move together. Judge each endpoint separately. Before requesting quotes, review documented specifications and clearance records for the exact configurations you're considering.
Conclusion
Picosecond lasers suit selected applications where ultrashort pulses matter. Nanosecond lasers remain a rational choice for established indications and budget-conscious operations. Pulse duration alone shouldn't decide it.
Match the platform to your treatment menu, patient population, evidence needs, service support, and total cost of ownership. Then confirm every claim against manufacturer documentation and the exact FDA clearance.
Frequently Asked Questions
Which is better, picosecond or nanosecond lasers?
Neither is universally better. Compare the indication, wavelengths, evidence, operator expertise, patient mix, and total ownership cost.
What's the difference between a nanosecond and a picosecond?
A nanosecond is 1,000 picoseconds. Shorter pulses shift energy toward photoacoustic effects, but wavelength, fluence, spot size, and design also shape results.
What are picosecond lasers used for?
Cleared uses include selected tattoos, benign pigment, acne scars, and wrinkles. Verify clearance for the exact model, wavelength, and handpiece.
What cosmetic results can pico laser treatments achieve?
Possible improvements include pigment, tattoo ink, acne-scar appearance, and texture. Results aren't guaranteed and vary by indication, skin type, settings, and plan.
How often should you get a laser peel?
Intervals depend on the laser, depth, skin response, and clinician protocol. Published studies used 2-3 week schedules, but those aren't recommendations; follow the treating professional's plan.
