This guide uses PiQo4 for the specific system and "picosecond laser" for the category. It's written for med spa owners, dermatology and plastic surgery practices, tattoo-removal clinics, and technical buyers. We cover how the technology works, what it can treat, how it compares, and which documents to check before you sign anything.
Key Takeaways
- Pulse duration is one factor; wavelength, handpiece, settings, and operator skill also drive results.
- Treat "Pico 4" as PiQo4 and confirm every spec with current manufacturer documents.
- Match the system to your patient mix, FDA 510(k) clearances, service, training, and total cost of ownership.
- No pico platform wins for every practice.
What Is Pico 4 Laser Technology?
A picosecond laser delivers energy in pulses measured in trillionths of a second. As Candela's explainer notes, one picosecond is one trillionth of a second. "Pico" describes pulse duration, not the device brand.
PiQo4 is the product name. Lumenis is the brand, and Focus Medical is the legal manufacturer. PiQo4 is a hybrid: it combines picosecond and nanosecond modes, so not every treatment on it uses a picosecond pulse.
Specs to research, not assume
The name tells you little. Request the current spec sheet and check:
- Pulse duration and wavelengths
- Peak power and fluence range
- Spot sizes and repetition rate
- Handpieces and fractional options
- Cooling and treatment modes
Public sources disagree on some of these. The FDA's 2015 clearance summary lists a 500 ps pulse, while the 2018 Lumenis brochure lists 600/800 ps and 2/8 ns.
The brochure cites a 2,000 mJ maximum, which is not interchangeable with the lower pico-mode energy figures in the FDA table. Some third-party lists differ again. Ask the manufacturer or seller which figures apply to the exact serial number you're quoted.
How Does Pico 4 Work?
The photoacoustic mechanism
Ultra-short pulses fragment ink or pigment into smaller particles, which the body then clears. The American Academy of Dermatology describes this fragment-and-clear process and notes that not every ink layer can be safely treated in one session.
Picosecond lasers still produce some heat. US research describes both photothermal and photomechanical effects, with the mechanical effect likely predominant under study conditions. "No heat" is marketing shorthand, not physics.
Wavelength and clearance
Wavelength must suit the target's color and depth. The Lumenis brochure lists 1064, 650, 585, and 532 nm.
Its ink chart assigns:
- Black to 1064 nm
- Red to 532 nm
- Green to 650 nm
- Blue and purple to 585 nm
The FDA's 2015 table covers 1064 nm for black, brown, green, blue, and purple inks, and 532 nm for red, yellow, and orange. The lists overlap, so treat the assignments as non-exclusive.
After treatment, the body gradually processes fragments. Speed and completeness depend on ink composition, depth, density, treatment area, immune response, and spacing.
Fractional delivery
A fractional option, which Lumenis calls PicoFractional, shifts the goal from targeting discrete pigment to triggering a controlled dermal response for texture or scars. Buyers should confirm which fractional accessory is included and what it's labeled for.
Why pulse duration isn't enough
Pulse duration is only one variable. Outcomes also depend on:
- Spot size, fluence, and repetition rate
- Beam profile and cooling
- Customization by skin type
- Operator technique
Pico versus nano evidence is mixed:
- A 2022 German split-tattoo study (23 subjects) found pico clearance numerically better but not statistically different, with less pain on the pico side.
- A 2026 Shanghai trial (30 subjects) reported 73.3% versus 23.3% satisfactory clearance after five sessions, using 755-nm lasers, not PiQo4.
Neither study predicts PiQo4 results. No universal session-count advantage follows from pulse duration alone.
What Can Pico 4 Treat?
Tattoo removal and multicolor ink
Tattoo removal is PiQo4's documented core. FDA clearance K151473 (September 1, 2015) covers 1064 nm for darker inks in Fitzpatrick I-VI and 532 nm for red, yellow, and orange in I-III.
Planning depends on:
- Ink type, saturation, and layering
- Depth and tattoo age
- Location and existing scarring
- Skin type and prior treatment history
Expect progressive fading. Complete clearance isn't guaranteed, and session counts must be individualized. One clinical guide cites 4-8 sessions, but that is a range, not a promise.
Pigmented lesions and discoloration
Lumenis markets PiQo4 for lentigines, pigmented lesions, and cafe-au-lait birthmarks. The FDA indications table, however, is tattoo-specific. Suspicious or undiagnosed lesions need medical assessment before any laser treatment.
Melasma and post-inflammatory hyperpigmentation (PIH) need separate planning. K151473 does not establish melasma clearance for PiQo4. A 2023 randomized category trial reported recurrence in 4 of 59 patients (6.8%); that study was not conducted on PiQo4.
Acne scars, wrinkles, and texture
Fractional delivery can support collagen remodeling, which differs from ablative resurfacing. A 2015 US study of a different 755-nm picosecond system with a diffractive lens found mean scar-volume improvement of 24.0% at one month and 27.2% at three months. It was small and uncontrolled.
Lumenis markets rejuvenation, but published materials do not list PiQo4 effect sizes or a scar or wrinkle FDA label. Treat "rejuvenation" as marketing language until labeling says otherwise.
Skin of color and risk management
Lumenis states that persons with dark skin may be at increased risk of hypopigmentation. The 1064-nm tattoo indication covers Fitzpatrick I-VI, but 532 nm is limited to I-III.
A 2016 retrospective review of 56 Fitzpatrick IV-VI patients on a different picosecond system reported transient erythema and hyperpigmentation that resolved. It did not break out separate PIH and hypopigmentation rates.
For darker skin, practices typically weigh:
- Careful wavelength choice and conservative starting settings
- Test spots, cooling, and adequate spacing
- Sun exposure history, active inflammation, and medications
- Aftercare and documented informed consent
No pico laser is automatically safe for every skin type. Operator experience matters as much as the device.
How Should a Practice Evaluate Pico 4 Before Buying?
Start with your service mix
Decide whether demand is tattoo removal, benign pigment, rejuvenation, acne scars, or a mix. Then map that to wavelengths, handpieces, and patient skin types. PiQo4 suits an experienced tattoo-removal practice better than one chasing broad skin rejuvenation.
Build a due-diligence checklist
Get the current manufacturer spec sheet and verify:
- Pulse durations, wavelengths, and energy/fluence ranges
- Spot sizes, repetition rate, and handpieces
- Fractional capability and cooling
- Electrical and room requirements
- Included accessories, in writing
Compare by indication, not reputation
Use the same framework for each platform and note which accessory enables each claim.
| Platform | Documented configuration | Label scope |
|---|---|---|
| PiQo4 | Four-wavelength nano/pico | K151473 tattoo table |
| PicoSure Workstation (K261570) | 755 nm, optional 532/1064 nm | Tattoos, named pigment disorders, scars and wrinkles with Focus Array (I-IV) |
| PicoWay (K153527, K162454) | 1064/532 nm, optional 785 nm and Resolve | Tattoos; acne scars with Resolve (II-V) |
| enlighten III (K182997) | 1064/532/670 nm | Tattoos, pigment; acne scars with MLA (II-V) |
FDA clearance is a substantial-equivalence decision, not an efficacy ranking. Clearance, clinical evidence, and promotional copy are three different things.
Calculate total cost of ownership
No authoritative public list price for PiQo4 is published. Market estimates, such as the roughly $140,000-$200,000 planning range for historical or new-old-stock units, are not manufacturer list prices. Budget beyond the sticker:
- Installation, shipping, and training
- Service contracts, calibration, and replacement parts
- Financing, downtime, insurance, and room changes
- Warranty terms, including handpieces
One comparison listing shows a one-year warranty, but don't assume a standard public warranty. Get parts, labor, travel, and handpiece coverage in writing.
New versus pre-owned
PiQo4 appears absent from Lumenis' current US aesthetics menu, so treat it as potentially legacy. Confirm accessory availability and future support. For pre-owned units, request:
- Service history and calibration records
- Laser hours or usage records
- Ownership transfer and software or handpiece compatibility
- Return terms and qualified technician access
Lumenis offers equipment-history records. The FDA's servicing guidance separates servicing, which restores original specifications, from remanufacturing, which significantly changes performance or intended use and carries different regulatory implications.
Cross-check your specs
The Pico Laser Buyer's Guide maintains a manufacturer-backed comparison library across 16 platforms, covering wavelength, pulse duration, energy, fluence, and spot size. It's an independent capital-equipment decision aid, useful for cross-checking specs. It isn't a substitute for clinical, regulatory, or legal advice.
Frequently Asked Questions
How does pico laser tattoo removal work?
Short laser pulses fragment tattoo ink into particles the body gradually clears. Wavelength is chosen by ink color and depth, and removal usually takes an individualized series of treatments.
What laser is best for tattoo removal?
No single brand wins. The best fit depends on ink colors, tattoo characteristics, skin type, available wavelengths, operator expertise, and regulatory documentation.
What is the difference between Pico 4 and PiQo4?
"Pico 4" is a search term or informal shorthand. PiQo4 is the product name, and you should verify it against current Lumenis documentation.
What wavelengths does the PiQo4 laser use?
The 2018 Lumenis brochure lists 1064, 650, 585, and 532 nm. Confirm against the current manufacturer spec sheet, since third-party lists conflict.
Is Pico 4 laser safe for darker skin tones?
It can be appropriate for some darker skin types with proper assessment and conservative settings. Safety depends on wavelength, indication, operator training, test spots, and aftercare. Lumenis warns of hypopigmentation risk.
