Which laser cutting technology is right for you — fiber or CO₂?

It's a decision that has shaped manufacturing for decades.

For decades, CO₂ lasers were the backbone of industrial manufacturing—powering sheet metal cutting, general processing, and especially non-metal applications—with their proven reliability and high output.

Today, the landscape is shifting: fiber lasers, offering higher electro-optical efficiency, faster cutting speeds, finer beam quality, and lower maintenance costs, are rapidly transforming the metal processing market and establishing themselves as the new mainstream.

For industries such as metal fabrication, heavy equipment, and automotive, this choice isn't only technical — it directly impacts production efficiency and return on investment.

In this article, we'll compare fiber and CO₂ laser cutting from principles to performance, costs, and applications, helping you choose the best fit for your business.

1. How They Work

Fiber lasers

Generate light through a solid-state design using fiber optic cables, with a wavelength around 1.06 μm. Metals absorb this shorter wavelength very efficiently, resulting in faster, cleaner, and more precise cuts. Their fully sealed design minimizes adjustment and reduces maintenance.

CO₂ lasers

Use a gas mixture in a sealed tube to generate light at 10.6 μm. This wavelength is excellent for non-metal materials like wood, acrylic, plastics, and textiles, but is less efficient for reflective metals such as aluminum or copper. CO₂ systems also rely on mirrors to guide the beam, which increases alignment needs and upkeep.

The chart below shows how different materials absorb laser energy at various wavelengths. Notice how metals like copper, aluminum, and brass absorb far more efficiently at the shorter wavelength of fiber lasers (~1 μm), while CO₂ lasers (~10.6 μm) are better absorbed by non-metals.

2. Cutting Performance

Speed & Efficiency

Fiber lasers typically achieve around 30–40% efficiency, compared to only about 10% for CO₂ lasers. This higher efficiency means fiber lasers use less power while delivering noticeably faster cutting speeds in metal processing, especially for thin and medium sheet metals.

The following charts clearly illustrate the cutting speed differences between fiber and CO₂ lasers across various material thicknesses. As shown, fiber lasers — especially at higher power levels — maintain significantly higher speeds on both carbon steel and stainless steel compared to CO₂ systems.

Thickness

• Thin to medium metals (0.5–20 mm): Both fiber and CO₂ lasers remain practical choices, with performance largely depending on the material and production needs.

• Very thick plates (>25 mm): High-power fiber lasers have become the preferred solution, offering faster speeds, lower energy use, and cleaner results.

The table below shows the maximum cutting thickness different laser powers can achieve for common materials. As shown, fiber lasers at the same power level already cover the entire cutting thickness range of CO₂ systems. What's more, with breakthroughs at 30 kW and even 60 kW, fiber lasers now reach cutting thicknesses of up to 100 mm.

Material Capability

CO₂ lasers were once used across both metals and non-metals. With fiber lasers offering shorter wavelengths that metals absorb more efficiently, the division became clear: fiber for metals, CO₂ for non-metals.

• Metals (steel, stainless, aluminum, copper, brass): Fiber lasers excel, especially with reflective alloys that CO₂ lasers struggle to process.

• Non-metals (wood, acrylic, textiles, plastics): CO₂ lasers deliver smoother edges and polished finishes.

3. Cost Comparison

Initial Investment

At the same power level, fiber lasers are now usually cheaper than CO₂ systems, thanks to mature technology and higher demand.

Operating Costs

• Energy consumption: Fiber lasers consume less electricity thanks to higher efficiency.

• Maintenance: CO₂ systems require mirror and lens replacement and regular alignment; fiber lasers, with fewer optical components, demand less routine servicing.

Long-Term ROI

Over the long run, CO₂ systems may incur higher operating costs due to energy use and maintenance. Fiber lasers, with longer lifespans, lower energy consumption, and fewer consumables, often provide stronger returns for continuous, high-volume production.

4. Choosing the Right Laser

When deciding between fiber and CO₂, ask yourself:

What materials do you cut?

Metals → Fiber; Non-metals → CO₂.

If you need to cut both metals and non-metals (multiple material types) → CO₂ laser is recommended.

What thickness range?

Thin to medium sheets(0.5–20 mm) → Both fiber and CO₂ can be effective;

Thick plates (>25 mm) → High-power fiber lasers are generally preferred.

What's your production volume?

High-volume → Fiber; Low-volume or mixed jobs → CO₂ may suffice.

What’s your worktable size requirement?

Standard size (~3.0 × 1.5 m) → Both fiber and CO₂ are suitable; Large-format cutting → Fiber laser is more reliable due to stable beam quality over long transmission distances.

What's your budget?

Limited budget → Fiber laser; High budget with extremely high cut quality requirements → CO₂ laser;

Focus on long-term ROI (return on investment) → Fiber laser.

Conclusion

There's no single “best” laser — the right choice depends on your materials, workload, and financial goals.

For metal fabrication, especially with reflective alloys and high throughput needs, fiber lasers deliver speed, efficiency, and long-term savings.

For non-metal applications or mixed cutting environments, CO₂ lasers remain relevant and cost-effective.

By aligning your investment with your core business requirements, you'll ensure both immediate performance and sustainable growth.