If it’s not in the visible range you can’t see it… that’s a lot of bandwidth of frequencies that can be used… There are a few…

UV Laser Diode365nm

Hi Jack, thanks for the quick response. If I understand correctly, summarizing the technology (if that’s what it can be called) a generic laser diode (in my case 40W) is not considered UV because, quite simply speaking, you can see the beam of light and from what I saw in a video of a UV laser the ash is invisible, only the engraving is visible.

UV Laser Diode254 nm

Hello everyone! By the topic you can guess how noob I am. I am portuguese and my english is far from perfect, so sorry in advance. (Any misunderstood is google translator fault ) So, i’ve tried to clarify my doubt on the internet but I haven’t found anything that clarifies me properly. I resort to your help hoping this is not already a debated subject (at least I didn’t find anything enlightening on the forum)

diodelaser中文

Third test, as i do not have any solvent at my disposal I try to invert the acrylic sample and and run a material test. Until here all tests were made with painted surface face up, this test was made with painted surface face down. I run a test like this because I intend to evaluate the reflection effect on acrylic. The result was interesting,… cracks everywhere, down side (painted side) melted on the most power and lower speeds hits, and curios is at 100% power between 2000 and 1500mm/min it burns face up side. Testing acrilyc011040×780 182 KB Testing acrilyc021920×1440 150 KB

diodelaser是什么

The OpenMV Cam is a low-cost, extensible, Python-powered, machine vision modules and aims at becoming the “Arduino of Machine Vision“. Our goal is to bring machine vision algorithms closer to makers and hobbyists. We’ve done the difficult and time-consuming algorithm work for you leaving more time for your creativity!

Laser diodesource

The OpenMV Cam is like a super powerful Arduino with a camera on board that you program in Python. We make it easy to run machine vision algorithms on what the OpenMV Cam sees so you can track colors, detect faces, and more in seconds, and then control I/O pins in the real world.

Here’s some more glass lasering. I mirrored the cut and put the tape on the bottom of the glass. I figured that way it’s burning the tape closest to the glass first, instead of burning thorough the tape. 200mm/min, 100% power, “Fill” in Lightburn...

It does leave some residue on the plastic, but was easily removed with a product called “Goo Gone”. I’m sure it is sold under different names, also called citrus cleaner, or something like that. The cleaner does not harm the plastic at all.

If the laser is in the visible spectrum of frequencies then anything that is clear will not be able to damage (cut or engrave) that material…

Hello Tim, thank you for your reply. That’s an option I’ve been thinking about. My concern is if it left any residues of tape on acrylic. That´s not suitable for what I intend to do.

UV laser

First test i try to remove the paint with thinner. (I am convinced that I already clean acrylic with thinner but,… maybe not. )

What you can do is mask the clear acrylic with something like tape or paint. My guess is that when the laser burns the mask, it will melt the acrylic underneath and make it seem engraved. I have a 450nm 7watt diode laser and have done this with glass achiving pretty good results.

I’m working with Lightburn and a diode laser GRBL generic machine. I’ve been experimenting a lot with different materials (as ideas come up). Right now I’m trying to engrave clear acrylic and from what I’ve read UV technology would be the most suitable for what I want. Knowing some of the risks of diode laser machines due to the emission of UV rays, I had a doubt whether a diode laser is the same thing as a UV laser.

OpenMV Cams are designed to make using machine vision in the real world easy. They combine simple I/O pin control, like on an Arduino, with high-level machine vision algorithms.

If I understood correctly, then from what you mention and the image below, only diodes that work at a frequency below 400nm are considered UV, right? Wavelength723×377 25 KB

Hi Tim, I think that is “stick remover” and yes it possible to buy here in Portugal. Which by the way is a good country to born if you want to talk Portuguese.

UV lasermodule

EDIT: Just tried with blue painters tape on an old CD case. I know I have some real acrylic around, but I just moved and cannot find it.

I found a recent thread mentioning that you can order it from Amazon in Portugal. https://www.reddit.com/r/MonsterHigh/comments/12zrvcu/anyone_know_of_an_alternate_to_goo_gone_available/

You are correct. If we were sipping amps in some mission-critical application, or using a much lower power laser, efficiency might be a concern. At this level, unless its white tape, I don’t think it’s factor worth worrying about.

UV laserwavelength

Tanks Jack. For now I am clear about the doubt that originated this topic. Of course now I’m more curious about UV lasers but that will be a subject for debate later.

I was wondering: my laser has 455 nm wavelength too. It is beyond UV, of course, in the blue range: that’s the visible color when it works. Isn’t blue tape (or anything blue) inefficient? My understanding of physics (which might be wrong) is that blue material is blue because it strongly reflects this color. Isn’t something red or orange, or just plain black, more efficient for such masking?

You can extend your OpenMV Cam's functionality with shields that you can attach to it like an Arduino. We have a variety of shields available that you can stack on the front and back of your OpenMV Cam.

I understand they work for acrylic but I don’t have one of those, mine are led, co2 and fiber… they have a different to no effect, depending on the material.

Anything that damages material will produce some type of debris… the laser doesn’t destroy things out of existence. Could be gas if it vaporizes the material or any size of debris depending on how the laser damages the material…

Meanwhile,… Some material test i have made with acrylic. Power from 10 to 100%, speed from 500 to 2000mm/min, 40W diode laser 450nm and air assist. Spayed with black acrylic paint on one side.

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