MOPA laser colour oxidisation spectrum

What is a MOPA Laser?

New to fiber lasers? Here's the plain-language explanation — and why layer management is the key to great colour results.

MOPA stands for Master Oscillator Power Amplifier. It's a type of pulsed fiber laser that lets you independently control pulse width and pulse frequency — something standard Q-switched fiber lasers cannot do.

That extra control unlocks a remarkable capability: colour marking on stainless steel and certain coated metals without any paint, inks, or coatings. The laser heats the metal surface to precise temperatures, creating a thin oxide layer that reflects light at different wavelengths — producing vivid, permanent colour.

By varying the pulse width, frequency, speed, and power, you can produce a full spectrum — from deep red and warm orange through yellow, green, blue, and rich violet. Popular MOPA sources include the JPT MOPA M6 and M7, widely used in jewellery, engraving, small business production, and maker workshops.

The challenge: each colour requires a different set of laser parameters, and a single image can need 20+ distinct colour passes. Managing that in LightBurn manually is slow and error-prone. MOPA Color Studio solves that problem.

From Image to Laser-Ready in Four Steps

MOPA Color Studio handles the complex layer setup so you can focus on engraving.

Step 01

Upload Your Image

Drop or select any PNG, JPEG, or BMP. T1 auto-fills with your filename, type, and dimensions as a reference layer.

Step 02

Detect Colours

The tool scans your image and groups distinct colours into up to 28 working layers — Layers 00 through 27.

Step 03

Map Parameters

Each layer maps to MOPA laser settings using the built-in colour guide. Adjust for your machine and material.

Step 04

Export to LightBurn

Click Export LightBurn. Open the .lbrn file in LightBurn, group, position on your workpiece, and engrave.

What's Inside

Everything built into a single browser file — nothing to install, nothing to configure.

30-Layer System

Layers 00–27 handle colour passes. Layers 28 and 29 are designated Reserve/Aux — pre-labelled and open for cut outlines or custom shapes. T1 holds your file metadata.

Layers 00–29 + T1

Auto Metadata — T1

When you import an image, T1 automatically fills with the file name, type, and dimensions. Editable at any time. It does not fire the laser — it's a reference record.

Auto-populated on import

MOPA Colour Guide

A built-in reference guide provides starting laser parameters for each colour pass. Use it as a baseline and tune for your specific machine, material, and surface finish.

Built-in reference

Reserve / Aux Layers

Layers 28 and 29 are clearly labelled and intentionally open. Add cut lines, engraving borders, or custom geometry without disturbing any of your colour layers.

Layers 28 & 29

Built for MOPA Users

From first-time hobbyists to professional engravers — if you're using a MOPA fiber laser with LightBurn, this tool is for you.

Hobbyists

Exploring MOPA colour marking at home? Get organised, consistent layer setups without the manual grind.

Small Businesses

Speed up production with repeatable layer setups across jobs. Export, open, engrave — every time.

Laser Engravers

Handle complex multi-colour jobs with a systematic, reliable layer workflow that scales with you.

LightBurn Users

Already using LightBurn? MOPA Color Studio exports directly to .lbrn — open it and go.

Spotlight Program

Product Spotlights

Machines featured by vendors paying for placement on MOPA Color Studio — directly linked to their product pages. Vendor Spotlights are earned by maintaining three or more active Product Spotlights at the same time.

Get your machine listed →

Your Brand Name Here

HERO IMAGE
16:9
DETAIL 1
16:9
DETAIL 2
16:9

Brand overview — two to three sentences introducing the brand and what they make. This is where your Vendor Spotlight headline copy will appear.

Brand story — a paragraph or two about your origins, your history with fiber lasers, and what makes your brand distinctive. "An optional founder quote sits here." — Name, Title

List your brand →

Sell laser engraving machines? All laser types welcome — MOPA, dual-laser, UV, CO2, diode, galvo, and more. From $9.99/mo or $99/yr.

Join the Spotlight Program →

Ready to try it?

Free, runs in any browser, no account needed. Your first export in under five minutes.

Open Studio
★★★★★"Finally, a tool that makes MOPA color marking make sense. I use it on every job."— Mike R.
★★★★★"The LightBurn export saves me so much setup time. This is exactly what our community needed."— Sarah T.
★★★★★"Simple, accurate, and completely free. I recommend it to every fiber laser owner I know."— Dave K.
★★★★★"Set up my first colour job in under 10 minutes. Incredible for beginners and pros alike."— James L.
★★★★★"Finally, a tool that makes MOPA color marking make sense. I use it on every job."— Mike R.
★★★★★"The LightBurn export saves me so much setup time. This is exactly what our community needed."— Sarah T.
★★★★★"Simple, accurate, and completely free. I recommend it to every fiber laser owner I know."— Dave K.
★★★★★"Set up my first colour job in under 10 minutes. Incredible for beginners and pros alike."— James L.

Got Questions?

Everything you need to know about MOPA Color Studio, MOPA fiber lasers, and getting started with colour marking.

What is a MOPA fiber laser, and why does it produce colour?

MOPA stands for Master Oscillator Power Amplifier — a type of pulsed fiber laser that lets you independently control pulse width and pulse frequency. That extra control allows colour marking on stainless steel and certain coated metals without paint, inks, or coatings. The laser heats the metal surface to precise temperatures, creating a thin oxide layer that reflects light at different wavelengths to produce vivid, permanent colour.

Does MOPA Color Studio work with ComMarker, OMTech, Monport, xTool, and Cloudray machines?

Yes. MOPA Color Studio works with any MOPA fiber laser machine that uses LightBurn. This includes machines from ComMarker (B4, B6), OMTech (MOPA series), Monport (GM, GT, GA series), xTool (F2 Ultra), and Cloudray (GM LiteMarker, MP Neo series). It also works with any machine using a JPT MOPA M6 or M7 source. The tool exports a standard .lbrn file that opens in LightBurn — your machine settings stay yours.

What materials can I colour-mark with a MOPA fiber laser?

MOPA lasers produce the most vivid colours on stainless steel — particularly 304 and 316 grades with a polished surface. You can also achieve colour marking on titanium, certain coated metals, and some anodised aluminiums. Results depend on material grade, surface finish, focus, and your specific MOPA source's pulse-width range. Plain (non-stainless) steels and most plastics will not produce true colour.

How do I open the exported file in LightBurn?

After exporting from MOPA Color Studio, you'll have a .lbrn file. Open LightBurn, go to File → Import (or just double-click the file), select your exported .lbrn, position it on your workpiece, group if needed, and engrave. The 28 colour layers and metadata layer come through automatically. The full step-by-step is in the LightBurn Import Guide in our Docs menu.

Is MOPA Color Studio really free? Are there any limits?

Yes, completely free. No account, no sign-up, no usage limits, no watermarks, no paid tier. The tool runs entirely in your browser — your images and exports never leave your computer. If you want to support the project, the most helpful thing you can do is share it with other MOPA users or send feedback via the form on the homepage.

What's the difference between a MOPA laser and a standard Q-switched fiber laser?

A standard Q-switched fiber laser has a fixed pulse width — you can adjust frequency, speed, and power, but not pulse duration. A MOPA laser adds independent pulse-width control (typically 2ns to 500ns), which is what unlocks reliable colour marking. MOPA machines cost more, but for colour work on stainless steel and titanium they're the only practical choice. For pure marking and engraving on standard metals, Q-switched is still excellent and cheaper.