Tattoo Laser Removal Machines: Matching the Machine to the Ink in Front of You

You have a patient in front of you with a tattoo. You have machines on the floor. The question isn't which box has the highest millijoule number. It's which machine matches the ink, the skin, and the schedule. This page is a selection matrix, not a primer. Use it after you've read the mechanism and cost pages, when you're standing in front of a specific tattoo and deciding which handpiece to pick up.

Wavelength first: read the ink color

Tattoo removal is selective photothermolysis. You need the pulse to be absorbed by the ink, not by surrounding skin. That means wavelength comes before anything else.

• Black and blue-black ink absorb across the visible and near-infrared. 1064 nm is the workhorse. It penetrates deep, and melanin absorption is relatively low. That makes it the default for black ink on any skin type.
• Red, orange, and brown inks reflect red light and absorb green. Use 532 nm. But 532 nm penetrates less and hits epidermal melanin harder. Treat these colors only on light skin, or with very conservative energy.
• Green, blue, and cyan inks need red wavelengths like 694 nm (ruby) or 755 nm (alexandrite). Our current Q-switched floor units, QN-03 and QE-01, do not emit those. That's a gap you should know before quoting a patient.

Both QN-03 and QE-01 cover 1064 nm and 532 nm. So your in-house range is black, blue-black, red, orange, and brown. Green and cyan need a referral. Don't try to force 1064 into green ink. You'll just heat the dermis and waste sessions. See our ink color page for the stubborn chemistry behind this.

Which machine on our floor

Both. The wavelength set is identical. The difference shows up later.

Pulse width: nanosecond or picosecond?

Once wavelength is fixed, pulse width decides how finely you fragment the ink. Q-switched nanosecond pulses, like the 6-8 ns on QN-03 or 6 ns on QE-01, blow ink into chunks. Picosecond pulses shatter those chunks into smaller ones, sometimes clearing resistant ink in fewer sessions. But we don't stock picosecond machines.

That's not a flaw. It's a filter. Nanosecond Q-switched still clears most black tattoos. But if you see a professional, multi-color, previously treated tattoo that didn't respond, or a patient who wants the fewest sessions possible, that's a referral trigger. Pushing a nanosecond machine harder won't make up for pulse width. It just adds thermal injury.

Our whole tattoo cluster is built on nanosecond Q-switched. The comparison page, q-switched vs picosecond, lays out the physics. Read it before you promise a session count you can't deliver.

Which machine on our floor

Both QN-03 and QE-01 are nanosecond. QE-01 uses electro-optic switching to hold 6 ns stable across its energy range. QN-03 sits at 6-8 ns. Neither replaces a picosecond unit.

Spot size and repetition rate: the throughput equation

Two numbers control how long a tattoo takes: spot diameter and pulse repetition rate. Larger spot covers more area per shot. Higher rep rate delivers more shots per minute. Both get the patient out of the chair faster, but they also change fluence and thermal load. You don't buy a machine for max spot. You buy it for the spot-rep combination your typical case load needs.

QN-03 fires 1-5 Hz with discrete spot sizes from 1 mm to 4 mm. QE-01 fires 1-10 Hz with a continuously adjustable 1-7 mm spot. That difference shows up fast on a table.

Let's rough out a 10 cm² tattoo. A 3 mm spot has an area of about 0.07 cm². Covering 10 cm² once, ignoring overlap, takes around 140 pulses. At 5 Hz, that's 28 seconds of pure firing time. Real treatment takes longer: you overlap, pause for cooling, check endpoints. But the math tells you that a 10 Hz machine with a 4 mm spot cuts the firing time to less than half. That matters when you book three large pieces in an afternoon.

For small, precise, high-energy work, QN-03's double-pulse and triple-pulse stacking reaches roughly 800 mJ and 1200 mJ at 1064 nm. That's a useful tool for deep fragmented black ink. For broad coverage of a dense sleeve, QE-01's 7 mm spot and 10 Hz rate wins. See the console-vs-gun question on form factor if you're unsure about platform style.

Which machine on our floor

Think QE-01 for volume, QN-03 for precise high-energy single-spot work.

Skin type sets the energy ceiling

Darker skin has more epidermal melanin competing for the laser. At 532 nm, that competition is dangerous: the epidermis absorbs the green light and you risk hypopigmentation or post-inflammatory hyperpigmentation. At 1064 nm, melanin absorption is lower, though not zero. So skin type, not ink color, often caps your energy.

You control that cap with three levers: lower fluence, longer intervals, and cooling. QN-03 has water plus air cooling built in. For QE-01, check the unit's cooling add-ons and keep cooling time in your protocol. Treat a tan or recently sun-exposed skin as a contraindication, not a tweak.

If your patient is Fitzpatrick IV to VI, stay on 1064 nm. Leave 532 nm for light skin or very superficial red ink. A conservative energy that still gives ink fragmentation is safer than a high energy that clears ink and epidermis together. Our PIH solution page explains what happens when you get that wrong.

Which machine on our floor

Both have the wavelength you need, but QN-03's integrated water and air cooling makes it easier to hold a consistent thermal envelope.

A working selection matrix

Put the four decisions in one table. This isn't a protocol. It's a pre-treatment sorting tool for technicians and buyers.

Buying one machine for a mixed clinic? Most general practices should start with a dual-wavelength nanosecond unit that includes 1064 nm and 532 nm, then decide if their case volume justifies a second unit with higher repetition rate or a picosecond. The answer depends on the tattoos that actually walk through your door.