You upload a design, press a button, and moments later, the machine has precisely cut intricate shapes with perfect accuracy.

But how does it actually work?

At Hawaii Makerspace, we teach people how lasers work because understanding the fundamentals makes you a better maker.

You'll know why certain materials cut beautifully while others are problematic.

You'll also understand safety requirements. 

In this comprehensive guide, we'll break down:

• The basic physics of laser cutting

• How CO2 lasers work (the most common type)

• The laser cutting process step-by-step

• How the design file becomes a cut

• Why different materials behave differently

• Safety considerations (understanding WHY they matter)

• Types of laser cutters and their uses

• Limitations of laser technology

By the end, you'll understand laser cutters deeply enough to use them confidently and creatively.

What Is a Laser?

Let's start with the fundamentals: what is a laser?

LASER Is an Acronym

LASER = Light Amplification by Stimulated Emission of Radiation

That's a mouthful, but it describes what lasers do: they amplify light and focus it into a powerful beam.

How Lasers Differ from Regular Light

Regular light (like from a light bulb or the sun) spreads out in all directions. If you imagine shining a flashlight, the light spreads into a cone that gets wider as it travels.

A laser beam is different. It's:

• Coherent: All the light waves are in sync with each other

• Focused: The beam stays narrow and doesn't spread much

• Monochromatic: It's a single color (wavelength)

• High intensity: All that energy is concentrated in a tiny area

This focus and intensity is what makes lasers powerful enough to cut through materials.

Visible vs. Infrared Lasers

There are many types of lasers emitting different wavelengths:

• Visible light lasers: Red pointers (650nm wavelength)

• Infrared lasers: CO2 lasers (10,600nm wavelength) - used for cutting

• Ultraviolet lasers: Used for some specialized applications

• Other types: Fiber lasers, diode lasers, etc.

For cutting and engraving, CO2 infrared lasers are most common.

These wavelengths are absorbed well by organic materials (wood, leather, fabric) and many plastics.

How CO2 Lasers Usually Work

Most laser cutters use CO2 lasers. Let's understand how they generate the cutting beam.

The Basic Components

1. The Laser Tube
A glass tube filled with carbon dioxide gas and other gases. This is where the laser light is generated.

How it works:

• Electrical current passes through the gas mixture

• This energizes the gas molecules

• As the molecules return to their normal state, they release light

• This light is infrared (invisible to the human eye but very powerful)

2. The Mirrors

Mirrors reflect and direct the laser beam. A typical setup has:

• A curved mirror at one end of the tube (reflects light back and forth)

• A partially reflective mirror that lets some light escape

• Mirrors throughout the system to direct the beam toward the cutting head

3. The Cutting Head

The laser beam passes through a lens (similar to a magnifying glass for the infrared light) that focuses it to a point.

This focused beam is incredibly hot, reaching temperatures over 1,000°F (538°C) at the focal point.

4. The Power Supply
Generates the electrical current that energizes the laser tube.

Modern laser cutters use high-frequency electrical circuits (often 10,000+ cycles per second) to create the laser beam.

5. The Cooling System

Laser tubes generate heat.

A water cooling system circulates cool water through the tube to keep it from overheating.

Without cooling, the tube would fail within minutes.

6. The Air Assist System

Compressed air blows across the cutting area. This:

• Clears away vaporized material

• Cools the cut edge

• Improves cut quality

The Cycle

1. Electrical current energizes the gas

2. Gas molecules emit infrared light

3. Mirrors direct the light through optics

4. The lens focuses the beam

5. The focused beam creates intense heat at a tiny point

6. This heat vaporizes or melts the material below

From Design File to Cut

A laser cutter seems to work like magic: upload a design, and it cuts.

But there are several steps between your design file and the final cut.

Step 1: The Design File

You create (or someone creates) a design file using:

• Vector software: Adobe Illustrator, CorelDRAW, Inkscape (preferred)

• Design apps: Adobe XD, Figma (if exporting to vector)

• Online tools: Some laser cutter software includes design tools

Important: Vector files are best because they contain outlines (lines with no thickness), not pixels. This matters because the laser interprets these lines as cutting paths.

Step 2: File Preparation

Before the laser cutter can read your file, it needs proper setup:

Line settings:

• Lines meant to be cut are set to a specific color (usually black) or line weight

• Lines meant to be engraved are set to a different color/weight

• Lines not meant to be cut/engraved are removed or set to "no print"

Scale and positioning:

• Your design is sized correctly for your material

• It's positioned on the cutting bed so nothing important is outside the material boundaries

File format:
Common formats are PDF, SVG, EPS, or native files (AI, CDR, etc.).

The laser cutter reads these and interprets the lines as commands.

Step 3: Loading the File

You import the file into the laser cutter's software. This software:

• Displays a preview of your design

• Allows you to position it on the bed

• Shows which lines will cut vs. engrave

• Calculates how long the job will take

• Allows you to adjust power/speed settings

Step 4: Focus and Alignment

Before cutting, you:

• Focus the laser: The lens position is adjusted so the laser beam focuses exactly at the surface of your material

• Align the design: You can use a pointer or mark to ensure the design is positioned where you want

This step is critical, improper focus means poor cuts.

Step 5: The Cut

With the laser cutter running:

1. Laser turns on: The electrical power activates, creating the laser beam

2. Beam moves: Mirrors and movement motors position the beam exactly where the design lines are

3. Material is cut: Where the beam hits, material vaporizes (or melts and gets blown away by air assist)

4. Beam follows the design: As you move the cutting head, the laser stays on, cutting along the design path

5. Cutting is complete: When all lines are cut, the laser shuts off

The entire process might take anywhere from 10 seconds (small design, fast laser) to an hour (large design, slow careful cut).

How Heat Creates the Cut

Understanding how the laser beam creates the cut reveals why different materials behave differently.

The Three Cutting Mechanisms

1. Vaporization (Most Common)
The laser beam heats material so intensely that it turns directly from solid to gas, skipping the liquid phase.

Materials that vaporize: Wood, paper, cardboard, fabric, leather, rubber, cork

Why it works: Organic materials have relatively low vaporization points and don't resist being vaporized.

2. Melting
The laser heats material to its melting point. The material liquefies, and air assist blows the molten material away.

Materials that melt: Acrylic, polycarbonate, some plastics, some rubbers

Why it works: These materials respond predictably to heat by melting at specific temperatures.

3. Burning/Charring
The laser heats material hot enough that it burns. The smoke and ash are blown away.

Materials that burn: Paper, cardboard, fabric

Why this is a challenge: Burning creates darkened edges (charring). For clean cuts, you want vaporization, not burning.

The Focal Point

The laser beam is focused to a tiny point, often smaller than a human hair.

This creates incredibly high heat density:

• Concentrated energy vaporizes the material instantly

• The cut width (kerf) is extremely small

• There's minimal heat damage to surrounding material

This is why laser cuts are so precise compared to other cutting methods.

So How Do Laser Cutters Work? 

Through physics, precision engineering, and focused light.

Understanding this from electrical current energizing gas, to mirrors directing light, to focused beam vaporizing material, transforms laser cutting from magic to technology you can use intentionally.

You'll make better material choices (now you know why acrylic cuts beautifully but glass doesn't).

You'll design better files (understanding the technology guides your designs).

You'll work safely (safety rules make sense when you understand the "why").

Laser cutters are powerful tools.

The more you understand how they work, the more creatively and effectively you can use them.

Whether you're a student learning fundamentals, a maker exploring the technology, or an entrepreneur considering a business, understanding laser technology is the foundation for success.

Laser Cutting at Hawaii Makerspace

Ready to use a laser cutter but want to understand it first?

That's exactly why our workshops exist.

Our Educational Approach

We don't just teach "press this button and cut." We explain:

• How the laser works

• Why materials behave the way they do

• What's happening inside the machine

• Why safety matters

• How to design files for successful cuts

This knowledge transforms you from a user to a confident operator who understands the tool.

Our Workshops

2-Hour Beginner Workshop:

• Laser physics fundamentals

• Design file preparation

• Safe machine operation

• Hands-on cutting with our commercial equipment

• Material selection guidance

Perfect for: First-time users, students, curious makers

Advanced Workshops:

• Specific material deep-dives

• Optimization techniques

• Business applications

• Equipment comparison

• Prototype development

Perfect for: Repeat users, entrepreneurs, designers

Equipment Rental:
Once you understand the technology, rent our laser cutters by the hour:

• Access to professional-grade equipment

• Expert staff for questions

• All safety gear provided

 

Book a workshop →
Rent equipment →