Colored annealing keyring with MOPA-Laser

Learn in this tutorial how you can create colored annealing on stainless steel with a MOPA laser.

In this tutorial we show you how to create coloured laser markings on stainless steel using a MOPA laser source.


Material required

Stainless steel key ring

Laser machine used

For this tutorial you can use any SpeedMarker series, Speedy fiber or Speedy flexx laser machine. Please note that MOPA laser sources are only available for SpeedMarker laser machine. 

Important information

Depending on the alloy, the laser marking results on your chosen stainless steel may differ from those shown in this tutorial.
To achieve different colours, the pulse width has to be changed. This means that you can only achieve black laser marking results using a standard fiber laser source.


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Step by step

Importing the laser parameters
Step 1

Step 1: Design

You can create your own design or import our template. Start by importing the PDF with layers into the SpeedMark laser software and assign parameters and fillings to the object.


Define the parameters in advance.

Filling for Fill style Line distance [mm] Additional
Text cross lines (bidirectional) 0.003 -
Letters Bidirectional 0.03 -
Lines Bidirectional 0.001 -
Dots Bidirectional 0.001 Optimise filling
Wind rose Bidirectional 0.001 Optimise filling
Border None - -
MOPA laser processing
Step 2

Step 2: Laser process

The next ste[ is to enter the parameter settings. These will differ depending in the laser machine you use and its available laser power. 

Position the work piece with the help of border marking.

Laser parameter Process Power [%] Frequency [kHz]
Text Marking 50 150
Letters Marking 60 60
Lines Marking 60 189
Dots Marking 84 261
Wind rose Marking 54 260
Border Positioning - -
Speed [mm/s] Pulse width [ns] Passes
1000 200 1
2000 200 2
2000 8 1
2000 100 1
2000 100 1
- - -
Laser marking colours onto a keyring
Step 3

Step 3: Post processing

As the annealing method of laser marking leaves the material surface unchanged there is no post processing required in this tutorial. 

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Questions about applications or settings?
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