Micro Laser Cutting: Achieving Sub-Millimeter Features in Production

Micro laser cutting is the process of cutting sub-millimeter features — apertures, slots, and meshes — with a tightly focused, galvo-steered laser beam. It’s how tiny, intricate parts get made repeatably, at production volume, without a physical tool ever touching the workpiece.

What Is Micro Laser Cutting?

Smaller than small. Handing random laser-cut parts to friends is always good fun. “Is this a mesh?” “What on Earth does this go into?” “How many apertures?” These are a few of the responses I often hear when showing people the parts I’m working on. Sometimes a calibration pattern is the most interesting. Sometimes it’s the density of the details on a part. Other times it’s the interaction of two densely cut arrays revealing strange patterns as they move past each other. The main thing that stands out in this line of work is how fun laser cutting continues to be.

Any precision part can put a smile on an engineer’s face. To get there, you need precise control — and at sub-millimeter scale, that control is everything.

How Micro Laser Cutting Works

Laser cutting at tight tolerances is more than just pointing a beam of light. Each pulse is the action at the end of a complex system built entirely to create the parts you need. Our laser systems consist of a few main components. First, the laser module itself, where photons are bounced around until they are ready to strike the intended target. Downstream of that, the beam is directed — sometimes by mirrors in a galvanometer that aim the pulse with almost alarming speed, sometimes along a fiber-optic cable — through lenses and windows to a point just under the surface of the workpiece. Think of it as drawing with light: the path on the part is only as honest as the motion and timing that put it there. Alongside this, we often use camera systems to align to existing features, ensuring we are exactly where we want to be.

Fixturing and Registration

None of that matters if the workpiece isn’t where the software believes it is. Flatness, fixture design, and how you register the part to the tool path are paramount. A brilliant cutting strategy on a poorly designed fixture can be useless. In practice, sub-millimeter work is less about a single setting and more about solving small problems — aligning, moving, pulsing — all of which need to be repeatable and reliable.

From Demo to Production

That is the difference between a neat demo and a production process. Anyone can win once. Holding tight tolerances lot after lot, shift after shift, is where the real discipline lives. It’s calibration when nobody is watching, checking the boring references, and keeping strong communication across the team. When it all comes together, you get exactly what drew you in at the start: parts that make people lean in and ask “how.”

Applications

Micro laser cutting suits parts where features are measured in fractions of a millimeter and edge quality can’t slip:

• Precision apertures and slots
• Filtration and shielding meshes
• Micro-perforation patterns
• Features cut into populated or partially assembled PCBs
• Micro part fabrication from thin sheet and metal foil

A note on scope: micro laser cutting is about cutting features and profiles. For material-removal work — machining pockets and 3D features to depth — see our laser micromachining service and our explainer on how the micromachining process works. For the most heat-sensitive features, we reach for femtosecond laser micromachining.

Ready to Start?

At A-Laser, we’re always looking for new ways to support our customers — including the challenging, out-of-the-ordinary projects that push what’s possible. If you have a sub-millimeter part in mind, get a quote and we’ll help bring it to life.