How to specify a diode laser stack

A replacement diode laser stack has to match the handpiece, the seals, the driver and the water circuit that already exist. An OEM diode laser stack can be chosen from a published optical map only after those same interfaces are designed around it. In both cases, watts are a headline. The buying description is optical, mechanical, electrical and cooling detail.

Start from the installed part or the interface drawing

Machine brochures often quote one power for a platform that has shipped with more than one stack. The catalogs on this site show the same pattern inside a single power family. Read the label on the stack, or the drawing for the handpiece you are building, before you pick a row from a table.

For a replacement, the marking on the metal wins over the number painted on the machine. For an OEM project, write the interface you need and then see which published row actually meets it. If a row does not state a field, treat that field as unknown. Do not fill it from a neighbouring SKU.

Why the same wattage is not the same part

These contrasts are all on the public Hangzhou SG stack pages checked on 7 November 2026.

At 600 W, LST-1012AI is published as 12 × 50 W, 808 nm, height 37 mm. LST-L-1012AI is also 12 × 50 W and 808 nm, with height 49 mm. The configuration list uses item code Y019 for both names. Ordering “Y019” or “600 W” does not say which height you need.
The same 600 W page also lists 6 × 100 W builds and two HD lines at 5 × 120 W. C3120 is 808 nm only. C3016 is 808 nm × 2 + 1064 nm × 1 + 755 nm × 1 + 940 nm × 1. The light is not interchangeable just because both total 600 W.
At 800 W, LST-1016AI and LSR-1016AI / DVS-1016AI are 16 × 50 W at 808 nm with a stated height of 37 mm. HMA-808-50-16-D1 is also 16 × 50 W and 800 W, but the published wavelength is a range, 805–815 nm, with bar pitch 2.18 mm and drawing dimensions 40 × 39 × 49 mm. The page says no compatibility with the LST, LSR or DVS models is stated.
At 1000 W the text catalog includes both 10 × 100 W and 20 × 50 W stacks. Heights of 37 mm, 48.5 mm, 49 mm, 52 mm and 52.2 mm appear on specific rows, not on the family as a whole.
At 1200 W and 2400 W, single-wavelength 808 nm rows sit next to mixed maps that use 755 nm, 780 nm, 808 nm, 940 nm and 1064 nm. The bar order is part of the optical specification.

Optical requirements

Write the wavelength of each bar, not a single marketing wavelength, unless the stack really is one wavelength. Record the bar count and the power of each bar. Where the catalog says “with FAC”, fast-axis collimation is part of that build and should be copied into the request. Where it says nothing about FAC, do not assume a lens is present or absent.

One emitting area is published in this set: 10 × 32.7 mm on HMA-808-50-16-D1. The same page says its emitting-area diagram is schematic and not to scale. Do not measure a diagram and call it a dimension. Beam divergence, spot size at the skin, and pulse energy delivered by a handpiece are not specified on these stack pages, so they are not specified here.

Mechanical requirements

Record stack height, footprint, and whether the module is housed or bare. Q2785 is published as an unhoused 1200 W module, 808 nm, 12 bars, with the photograph also marked LT-00MH001200N. That is a different mechanical object from a flanged, windowed stack of the same nominal power.

Water-port position is a fit issue. The 1000 W text for item Q4410 notes dual-row rear water ports, together with FAC. Other rows do not. An optical cone, beam shaping, or a “special housing” note also belongs in the request when the catalog uses those words, and only for that row.

If you measure a sample, label it as a sample. The 800 W page records a 49.07 mm caliper reading on one HMA-808-50-16-D1 photograph and says it does not replace the drawing dimensions of 40 × 39 × 49 mm. Axis order follows that drawing; this site does not assign which number is height.

Electrical requirements

The driver has to stay inside the stack’s current, voltage, duty cycle, pulse width and repetition rate. Those five figures are published together for HMA-808-50-16-D1 only:

Current: 45 A typical, 50 A maximum
Voltage: 28.8 V typical, 32 V maximum
Duty cycle: 20% typical, 30% maximum
Pulse width: 20 ms typical, 200 ms maximum
Frequency: 1–10 Hz

The maximums are not available at the same time. The page states that 200 ms applies only at 1 Hz, and 10 Hz applies only at 20 ms. No other SKU in the 600 W, 800 W, 1000 W, 1200 W or 2400 W text used here publishes this drive set. Connector pinouts are not published. A photograph that shows a plug is not a wiring diagram.

Cooling requirements

HMA-808-50-16-D1 is also the only SKU in this set with a full cooling record: macro-channel water cooling, deionized or distilled water, 20–30 °C (25 °C typical), 0.3–0.4 MPa (0.35 MPa typical), and 3.5–4.5 L/min at the outlet (4 L/min typical). The handling note says to start cooling water before applying power, keep the stack dry, avoid condensation, keep the window clean, stay inside the documented ratings, and protect the part from dust and electrostatic discharge in transit. It also warns against eye and skin exposure to the beam.

Those sentences belong to that SKU. A 2400 W, 24-bar stack is a different thermal load. Until its own flow, pressure and channel type are published, they stay off the specification.

OEM projects and replacement projects

An OEM diode laser stack request can choose any published optical map whose mechanical and electrical interface you are willing to design. Say which row you mean, by model and item code, and attach the interface you will build: height, ports, connector and the pulse program.

A replacement diode laser stack request should name the marking on the failed part and the host handpiece’s constraints. A higher wattage is not an upgrade if the seals, the driver or the water fittings were built for a smaller or differently mapped stack. Changing only the 808 nm bars in a mixed-wavelength stack would also change the optical map, so the whole map has to be restated.

This site does not describe a procedure for opening a stack or exchanging individual bars. Ask for a complete stack and keep the identification at stack level.

What to prepare before a quotation

When the checklist is ready, send it from the quote request page. The form there opens your own email program with the details filled in, or you can message us on WhatsApp.

Have these items ready when a real destination exists:

A reading of the label, including every model line, not only the wattage.
The wavelength map, bar count and power per bar.
Height or the drawing dimensions, and whether the module is bare or housed.
Water-port arrangement and cooling limits, if you know them from the installed system.
The driver settings you actually use: current, pulse width, frequency and duty cycle.
Quantity and destination country, so shipping and lead time can be quoted.

What is deliberately absent

There is no price list, no stock count, and no compatibility chart. Warranty sentences exist on some source pages. They are not restated here as an offer from this domain. Chip-brand names are catalog descriptions of bars, not a qualification claim for Hangzhou SG. If you need a field that the tables mark “Not stated”, that field still has to be confirmed from the part or from a later quotation. It cannot be inferred on this page.

Continue to a family: 600 W, 800 W, 1000 W, 1200 W, 2400 W.