Short answer: a Q-switched laser delivers its energy in nanoseconds and a picosecond laser delivers it in picoseconds — roughly a thousand times shorter. That difference changes the physical mechanism, not just the speed. Nanosecond pulses work mainly by heat; picosecond pulses work mainly by pressure. Which one you buy depends on whether your menu is tattoo removal, pigment correction, or both — and on how much downtime your clients will accept.
The Mechanism Difference
One practical note on terminology before you compare quotes, because supplier catalogues are inconsistent and it costs buyers time. The nanosecond technology is listed as a q switched laser, a Q-switched laser and a q-switched Nd:YAG depending on the vendor. The pigment side of the category is sold as a picosecond laser, a pigmentation laser, a picosecond pigmentation treatment platform or a laser pigmentation removal system. On the tattoo side the same device appears as tattoo removal laser, laser tattoo removal equipment, tattoo removal device or simply a tattoo removal machine. The crystal is written Nd:YAG, Nd YAG laser or nd:yag laser. Readers searching for picosecond vs q switched and picosecond vs Q-switched are looking for the same comparison. These are naming differences, not technology differences. Compare wavelength, pulse duration and fluence, and treat the label as marketing.
Both technologies target pigment. Melanin in the epidermis and ink particles in the dermis absorb the laser wavelength, and the absorbed energy has to go somewhere. How fast you deliver that energy decides where it goes.
With a nanosecond Q-switched laser, the pigment absorbs energy and heats up. The particle fractures thermally, and the heat spreads into the surrounding tissue. That spread is why Q-switched treatments are effective but also why they carry more risk of thermal damage to adjacent tissue when too much energy is stacked in one pass.
With a picosecond laser, the pulse is short enough that the pigment has no time to conduct heat away. The particle absorbs energy and shatters from the resulting pressure wave — a photoacoustic rather than photothermal effect. Smaller fragments clear faster, less heat reaches surrounding tissue, and the treatment can be pushed harder with a lower risk profile. That is the entire commercial argument for the category, and it holds up: fewer sessions, less thermal risk, better tolerance for darker skin types when protocol is respected.
What Each Does Best
| Indication | Q-switched (nanosecond) | Picosecond |
|---|---|---|
| Black and dark blue tattoo ink | Effective; more sessions typical | Fewer sessions; cleaner clearance |
| Red, orange, yellow and green ink | Needs additional wavelengths; slower | Stronger advantage on stubborn colours |
| Freckles, lentigines, sun spots | Effective at low fluence | Effective; often fewer passes |
| Melasma | Used with caution at very low fluence | Used with caution; shorter pulses preferred by many operators |
| Dermal pigmentation (e.g. nevus of Ota) | Workhorse of the category | Faster clearance in reported series |
| Skin toning and texture | Limited | Yes, with fractional or focused handpieces |
| Device cost | Lower | Higher |
| Wavelengths available | Typically 1064 / 532 nm | Typically 1064 / 532 nm, often plus 785 nm |
Read the table as a menu of indications rather than a quality ranking. A well-run clinic with a Q-switched platform and a disciplined protocol produces good tattoo removal results. A clinic with a picosecond platform and no protocol produces burns. The technology sets the ceiling; the protocol decides whether you reach it.
Tattoo Removal: Why Colour Decides the Wavelength
Tattoo ink does not absorb all wavelengths equally. Black and dark blue ink absorbs strongly at 1064 nm, which is why it clears most readily on essentially any platform. Red ink absorbs better at 532 nm. Green, yellow and light blue sit in an awkward middle region that neither 1064 nor 532 nm addresses well, which is why green ink has a reputation for being stubborn — and why machines offering a 785 nm option exist.
This has a direct commercial consequence. If you are buying a machine for a tattoo studio, ask what proportion of local demand is colour work rather than black script and tribals. A laser tattoo removal machine with only two wavelengths will serve black ink and red ink well and leave the green work on your competitor's bed. Most professional buyers end up wanting as wide a wavelength set as the budget allows, and treating the third wavelength as the difference between a partial service and a full one.
Session count depends on ink density, colour, depth and how long the tattoo has been present — older tattoos generally clear faster because the ink has already been partly broken down by the immune system. Set expectations per tattoo rather than per square centimetre, and photograph at every session under identical lighting.
Pigmentation: Several Problems That Look Alike
Clients arrive asking for "pigmentation removal" carrying at least three different conditions, and they need different handling. Epidermal pigment such as freckles and sun-induced spots responds readily and predictably. Dermal pigment sits deeper and clears more slowly, needing more sessions. Melasma is neither of those: it is a reactive condition with a strong hormonal and ultraviolet component, and aggressive laser treatment frequently makes it worse. Melasma protocols use the lowest effective fluence, longer intervals and compulsory photoprotection, and some clinics decline to treat it with laser at all.
That distinction is worth writing into your consultation script. A clinic that treats all three the same way will collect a small number of excellent results, a larger number of disappointing ones, and at least one patient whose melasma flared after an aggressive session.
Equipment Cost and Running Costs
Q-switched platforms sit materially below picosecond platforms at factory-direct level, and the gap is the main reason Q-switched equipment still sells well. Our own pico laser machine, the GOLDEN FANO PICO — a 1600 mJ ultra-picosecond Nd:YAG platform for pigmentation and tattoo removal — carries a $7,800 guide price. A comparable Q-switched platform typically costs less, and that difference is what you are weighing against session count and colour coverage.
Running costs are more similar than buyers expect. Neither technology consumes a per-treatment cartridge; the recurring costs are the handpiece or arm, protective eyewear for staff and clients, cooling consumables, and the cost of the extra sessions a slower technology requires. When you compare quotes, convert everything into cost per completed tattoo removal case rather than cost per session — that is the number that decides which machine was cheaper.
If your menu is 808 nm hair removal rather than pigment work, that is a different machine class entirely; see our laser hair removal category, and our laser machine overview for how the two fit together in one room.
Running both is common, and worth planning for. Buyers increasingly shortlist a diode and pico laser machine pair rather than a single platform, because hair removal and pigment correction are different services with different clientele and different booking patterns — one is a recurring, high-volume service, the other a course-based treatment sold in fewer sessions at a higher price. Two dedicated units cost more than one combined platform and need more space, but each can run at full duty cycle at the same time, which matters once both services are busy. If your volume does not yet justify two units, a single pigment platform plus an existing hair removal device is the lower-risk sequence.
Choosing: A Decision Checklist
- Colour coverage: which wavelengths does the unit offer, and how much green and light-blue ink is in your local market?
- Fluence consistency: does the platform hold output across a full treatment day, and is that documented?
- Spot sizes and handpieces: what ships standard, and what is optional — optional handpieces are a hidden line item.
- Skin-type safety features: integrated cooling, and whether the protocol includes Fitzpatrick-based fluence guidance.
- Certification: CE marking under the LVD and EMC Directives with documents naming the model, for your market.
- Training: a written protocol per indication, plus what staff should do when a case does not respond as expected.
- Consumable and spares supply: handpiece and arm availability, lead time, and price in writing.
Frequently Asked Questions
Is picosecond better than Q-switched?
Not universally — it is faster and gentler per session, which generally means fewer sessions and less thermal risk, but it costs more to buy. Q-switched lasers remain an effective, well-understood and more affordable route to the same indications. The right choice depends on your case mix, how much colour-ink tattoo work you expect, and your budget.
How many sessions does tattoo removal take?
It varies more by tattoo than by machine: ink colour, density, depth and age all dominate. Black ink typically clears in the fewest sessions because 1064 nm absorption is strong. Green and light blue are the slowest. Set expectations per tattoo at consultation, photograph every session under identical light, and quote a range rather than a fixed number.
Can a picosecond laser treat melasma?
It can be used, at the lowest effective fluence with long intervals and compulsory photoprotection — but melasma is a reactive condition and aggressive treatment can worsen it. Many experienced operators treat melasma primarily with topical protocols and reserve laser for selected cases. Never market pigment correction as a guaranteed single-session fix.
What is a good tattoo removal machine for a new studio?
One with the widest wavelength set your budget allows, documented fluence stability, integrated cooling, and a supplier who can deliver handpieces and consumables locally without a long lead time. Wavelength coverage matters more than headline output power for colour work, and training matters more than either.
Do these machines need consumables per treatment?
No cartridge is consumed per treatment the way a HIFU transducer is. The recurring costs are handpiece or articulated arm wear, protective eyewear, cooling supplies and replacement parts. Ask for those prices in writing before you buy, and calculate cost per completed case rather than cost per session.
What certification should the equipment carry?
CE marking under the LVD and EMC Directives, with test documentation naming the exact model and are valid for your market. A laser system is scrutinised at customs more than most aesthetic equipment, so ask to see the documents before you order. KOLIFU supplies pico and Q-switched platforms factory-direct with LVD / EMC test documentation, 36-month warranty, free training and 7-level OEM/ODM customization.