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Diode laser beam focusing
About different types of laser lens
Laser beam focusing
Our latest lens research
Beginner Guide Correct Laser Focus Point (PDF) written by Florian Kelsch
Measuring of a focal length (range) for different type of laser lens
Watch these video about laser beam focusing
Improvement of laser beam focusing
Adding 3rd spacer and get a fixed focusing range
No need to focus the laser again.
Focusing of a triple beam 30 watt laser
Laser focusing using a 3 element regular lens
It is very important to set up a proper focus range on your diode lasers.
Here is the guidance of how to set up a laser focus range on a 3D printer or CNC machine:
We experimented with an Endurance Anet A8 3D printer combo (a laser engraver + a laser cutter).
1. To setup “home”, that is to find 0 for the Z-axis we use the command “G28 Z0” for the Anet A8 3D printer.
2. We move the laser up to 50 mm above the Z axis.
3. Measure the range between the lens and the worktop, it is 37 mm, it means that the laser is 13 mm below the 0 (50 mm – 37 mm).
4. The estimated laser focal range for the 3 elements regular lens is ~60 mm, so we need to move the laser up to the expected focal range, that is 60 mm + 13 mm = 73 mm, where 3 mm is the difference between the 0 and the actual laser position.
5. Run the g-code (test1.gc)
This g-code draws 20 lines by way of changing the Z axis height starting from 64 mm (- 9 mm from the initial setting of 73 mm) up to 83 mm (+10 mm).
The optimal focal range is considered the one when the thinnest line (on a piece of wood or plywood) or most clear-cut (on an anodized aluminum plate) were made. To keep your laser in focus use always these parameters for the Z axis.
Do not forget to measure the thickness of the material that you are going to cut or engrave and add it to the initial height of the 0 levels.
We use an aluminum anodized plate 0.5 mm thick.
However, if you want to get even better results you may run another g-code (test2.gc) with smaller steps (0.1 mm).
The optimal focal range for a regular (long focal 3 element lens) in our experiments was 71.1 mm from the Z 0 (home) position.
As for this 10 watt diode laser you need to make a correction for the focal range to get the best engraving results: 71.1 mm – 13 mm (difference between the laser height and the Z 0 position) – 0.5 mm (thickness of the material)= 57.6 mm; this is the range between the lens and the surface of the work material.
Laser focusing using a G-2 lens
For a short focal G2 lens we start to make measurements at the Z height of 19.3 mm + 0.5 mm, the thickness of the anodized aluminum plate and get the best focal range at 6.8 mm hight.
We made a lot of different tests manually setting the focal range for each laser and each lens; it varies from 20 to100 mm for a 3 element lens, and from 2 to10 mm for a G2 lens.
For a 3 element lens the best focal range is 57.6 mm
For a G2 lens the best focal range is 6.8 mm.
Learn more about laser beam focusing
focus test (g-code example for laser beam focusing)
Installation and adjustment of a 10W laser on 3D printers Anet A8 from Inkscape & Repetier-Host
When the module is installed and fastened 1-2 cm above the extruder nozzle, proceed with its connection. Here everything is simple, there’s no need to rack your brains (we did it for you). are We connect the laser control panel directly to the module itself, we connect the 12V power supply to it, and connect the fan power to the FAN 1 connector to the control board of the 3D printer.
Next, to the laser module itself, we connect the 12V power separately (external power supply). If everything is connected correctly, the fans start working; to run the laser just turn on the toggle switch on the control panel, and a laser beam will glow.
Now it is necessary to adjust the lens to focus the laser beam. To make the task easier I recommend that you draw a line, approximately 4-5 cm long, using Inkscape. Convert these lines into a G-code and load it into the Repetier-Host program.
To adjust the focus measure the height of the laser above the workpiece on the work table with a ruler. As a starting point, I use the bottom of the aluminum box of the module itself. Next, lift the carriage up about 9 cm and begin to rotate the lens until the laser beam appears as a sharp small dot on the workpiece where you are going to engrave the lines. Start engraving. The focus is correct if the engraved line is clear. If not so repeat this procedure until you get a clear thin line, using the control in the program Repetier-Host, raise the carriage to any desired height (this can be done to within 0, 0.1 mm) and start again for engraving.
Explore abilities with z axes
Do this procedure to the extent that we do not have a clear, even and thin line.
Independent test of Endurance laser lens pack
“As you may know, Endurance Lasers offers several different lens configurations which are now available in a “pack.” I now have the standard 3-Element, which came with my laser, and the G-2, G-7, and G-8 lenses which I received a couple of weeks ago. Now that I had them all, why not do a little experimenting?”by John Walker
Laser cutting and laser engraving for home and for business.
Advantages of Endurance lasers
Multi-level testing system.
The guaranteed duration of the continuous operation ~48-72 hours.
True continuous power output
Our products have the rated power output as advertised – unlike Chinese analogues.
Can be turned on and off with 3.5-24V.
Variable power output.
Plug and play
Universal and compatible mount.
Compatible with most 3D printers and CNC machines.
Friendly return policy
Do not like the laser?
Simply return within 30 days and get a full refund.
Laser attachments and laser engraving (marking) machines.
Why do our customers buy lasers and engraving machines from Endurance?
We assist and give advice by Phone / Email / Facebook messenger / Telegram / Whatsapp / Viber.
We help to install and tune the laser. We offer qualified after-sales support.
Everything you need
We ship everything you need in one parcel to get started.
We ship all units within 4-24 hours. DHL express delivery allows you to get the package in 3-5 days.
All our lasers are tested and could work up to 10000 hours.
Do you have an old model? Upgrade your unit with more powerful one.