Color Laser Engraver for Stainless Steel, Titanium, Chromium

What Is Color Laser Engraving Machine?

Color laser engraving machine is a type of automatic CNC laser marking system that uses MOPA fiber laser generator to mark colors on stainless steel, titanium, and chromium. MOPA laser marking system uses a high-energy density laser heat source to act on the metal surface to generate colored oxide on the surface, or generate a colorless and transparent oxide film, which presents a colorful effect due to the light interference effect of the film. By controlling the laser energy and parameters, the oxide layers of different thicknesses can present different colors to achieve the purpose of color engraving.

What Is MOPA Laser?

The full name of MOPA is Main Oscillation Power Amplification, which is to couple the seed signal light and pump light with high beam quality into the double-clad fiber for amplification in a certain way, so as to realize the high power amplification of the seed light source. MOPA laser marking machine has certain advantages in the marking of special materials, such as laser blackening of digital product parts, mobile phone keys, transparent keys, mobile phone shells, key panels, electronic components, oxidation, plastic marking, oxidation treatment and coating surface marking such as electroplating and spraying, and color patterns on stainless steel materials can also be marked.

Color Laser Engraving Machine with Rotary Attachment

How Does Color Laser Engraving Machine Work?

The advantage of MOPA laser is that its pulse width and frequency are independently adjustable. Adjusting one of them will not affect other laser parameters, which is not available in Q-switch lasers. The characteristics of MOPA structure bring unlimited possibilities for color marking. In the actual marking operation, the pulse width, frequency, power, speed, filling method, filling interval, delay parameters and other factors will affect the color effect. The influence of these parameters will make the characteristics of the color change not obvious, but they are interrelated and affect each other.

The principle of color laser marking machine is: using an advanced MOPA laser generator, the high temperature generated by laser focusing makes the surface material of the material evaporate to expose the deep material, or the chemical and physical changes of the surface material caused by light energy to display the marking information.

There are three color rendering methods on metal surface: one is to generate colored oxides; the other is to generate a very thin colorless and transparent oxide film on the surface of stainless steel under the action of chemistry, electrochemistry or laser. The oxide film produces interference effects. The color appears on the surface; the third is that there is a mixed state of colored oxide and oxide film at the same time.　　

Color rendering principle of laser marking: under the action of the laser heat source, the metal generates colored oxide on the surface, or a colorless and transparent oxide film is formed, which presents various colors due to the interference effect of the light film. This is a metallic color. The basic principle of marking.

The following table shows the colors of several main oxides after the metal surface is oxidized by laser.

Under the action of the laser, the metal surface produces a laser thermal effect. Through the laser thermal effect, it is obtained that the laser energy density is proportional to the film thickness. As the laser energy increases, the color of the metal surface shows regular changes: yellow, red, blue, green until green gradually darkens. By controlling the laser energy density, the desired color can be produced on metal materials such as stainless steel, chromium, and titanium.

Color Laser Engraver Features & Advantages

1. The laser engraver adopts a scanning system for high-speed magnetic induction motor control with laser routes to the advantages of high accuracy and speed.

2. Fiber laser model has a over 100,000 hours service life. Almost no maintenance during this period.

3. Permanent marking: Laser marking is a permanent marking. It won't fade, run or become less discernable as time passes like traditional marking including ink jet, hand engraving, dot-peen marking.

4. Support coding, serial number, batch number, date number, two-dimensional bar codes and other codes marking.

5. Processed products arbitrary depth adjustable: Marking a clear, beautiful, permanent and difficult to wear.

6. High precision: 0.0025mm re-position accuracy. Minimum line width 0.01mm.

7. Non-contact process: Won't cause mechanical extrusion or mechanical stress to materials. Laser beam won't move the work piece.

8. Powerful software, which can support autocad, CordlDRAM mapping dxf, plt and bmp format.

9. Support almost all Windows-based software like Coreldraw, AutoCAD, Photoshop. No need to adjust Q-switch easier than YAG diode marking machine.

10. The rotary attachment is optional for cups, rings, pens, and more rotating marking projects.

Color Laser Engraving Machine Technical Parameters

Color Laser Engraving Machine Applications

Applicable Materials: The color laser engraver is used for metals (including rare metals), engineering plastics, electroplating materials, coating materials, coating materials, plastics, rubber, epoxy resin, ceramic, plastic, ABS, PVC, PES, steel, titanium, copper and other materials.

Applicable Industries: The color laser engraver is widely used in iphone back logo, TV controller keyboard, laptop keyboard, mobile phone keypad, plastic translucent keys, etc.

Color Laser Marking Machine Details

Color Laser Marking Machine with 2D Workbench XY Moving Table

Fiber Laser Engravers for Color Marking in Factory

Rotary Attachment for Rotating Color Marking

Sino-Galvo Galvanometer Scanner

Color Laser Engraving Machine Projects

In addition to color marking, the fiber laser marking machine can also be used for:

We also have more types of fiber laser engraving machines for color marking

Deep Blacks on Anodized Aluminum

Aluminum will not take oxide colors, but anodized aluminum is where a MOPA earns its second reputation: rich, even blacks. The adjustable pulse lets the beam darken the anodized layer itself without breaking through it or raising a burr, so phone shells, laptop lids, and control panels come out with crisp, dark logos on a perfectly smooth surface. This is exactly the finish behind branded consumer electronics, and it is why the marking happens after anodizing, never before, since the mark lives in that surface layer. The same settings also produce clean grays, so a logo and its fine print can carry two tones in one pass.

Backlit Keys and Paint Ablation

The translucent keys in the applications list hide a clever trick. Day and night buttons in cars and keyboards are molded in clear plastic, painted with an opaque coat, and then the laser skims the paint away in the shape of each symbol so the backlight shines through at night. The skill is removing the coating completely without chewing into the plastic beneath, which is precisely the fine energy control a MOPA has. You can see that pulse control at work in this MOPA marking video.

Choosing the Lens: Field Against Fineness

The marking window is set by a swappable lens, and the choice is a trade. A small field focuses the beam to its tightest spot, which means denser energy, richer color, and the crispest micro text. A large field covers trays of parts or big graphics in one go, but the spot grows and fine work softens. Serious color work favors the smaller lens, batch tag runs favor the bigger one, and swapping takes only a few minutes plus a focus check. The marking system setup guide walks through lens and focus changes.

Jigs Turn One-Offs Into Batches

Marking fifty pens or phone cases is only profitable if part fifty lands exactly like part one, and a simple jig makes that automatic. Trace the red-light preview, cut a nest from acrylic or plywood that holds the part in that outline, and every piece drops into position without alignment fiddling. Pair the jig with automatic serial numbering in the software and small production runs flow. Dark marks on bright metal also scan best, so serial numbers and QR codes stay readable for barcode guns down the line. Keep the lens clean between batches, as the daily maintenance guide shows, and when volume outgrows the table, a flying marking system marks parts on a moving conveyor.

Picking a lens field:

MOPA workshop checklist:

✅ Pick the smallest lens field that fits the job.

✅ Mark anodized parts after anodizing, not before.

✅ Test ablation power on one spare key first.

✅ Cut a jig so every part drops into the same spot.

✅ Auto-increment serials in the software for batches.

Dialing In a Color You Can Repeat

The machine produces a rainbow of colors on steel, but hitting a specific one takes method, because power, speed, frequency, pulse width, and spacing all shift the result and interact. The practical way to find a color is a test grid: mark a block of small squares while stepping two parameters, then read off the square that gives the color you want. Once you have it, save those exact settings as a named recipe in EZCAD software so you can call it up again. A recipe is tied to the material, though, so a different steel grade, finish, or new batch can move the color, and you retest to lock it back.

What to Expect: Limits and Durability

Color marking has real boundaries worth knowing before you buy. It works on stainless steel, titanium, and chromium, whose surfaces form the thin oxide film that creates color; aluminum and most other metals take only a black or etched mark. The colors come from that surface film, so they shift a little with viewing angle, and hard abrasion or high heat can dull them over time. For a mark that shrugs off heavy wear, a cut-in relief engraving lasts better than color. Consistency depends on keeping the metal and settings the same from piece to piece.

Which metals take color:

Color marking checklist:

• Mark color on stainless, titanium, or chromium.

• Clean and degrease the surface first.

• Run a test grid to find the color.

• Save the winning settings as a recipe.

• Retest when the metal or finish changes.

Frequently Asked Questions

Which metals can it color?

Color marking works on stainless steel, titanium, and chromium. Aluminum, brass, copper, and most other metals will not take these colors, but can still be marked in black or etched. For plain marks on any metal, standard fiber laser markers handle the job.

How durable are the colors?

They are bonded into the surface, so they will not wash off or fade like ink. But since the color is a thin oxide film, heavy abrasion or high heat can dull it, and the shade varies with viewing angle.

How do I get a specific color reliably?

Run a test grid that steps two parameters at a time, pick the square with the color you want, and save it as a recipe. Retest whenever you change steel grade or surface finish, since small differences move the result.

Can it also mark black and engrave?

Yes. The same MOPA laser marks crisp black, adds serial numbers and codes, and does light surface engraving, so color is one of several modes. For deeper, dimensional work, a 3D deep engraving machine is the better fit.

Is 30 watts enough, or do I need more?

For color and surface marking, 30 watts is plenty, since both are shallow surface processes. To cut real depth into metal or work faster on hard alloys, a 50W deep engraver does that better while still marking color.

Can it color round items like cups and rings?

Yes, with the optional rotary attachment. It turns the piece under the beam so the color wraps evenly around it, the way cups, bottles, and rings are done. Keep focus and speed steady so the color stays even all the way around.