Laser Cutting / Technology Comparison
Fiber Laser vs CO2 Laser Cutting: Which Technology Handles Your Material?
For cutting metal, fiber laser is the current production standard. It cuts faster at thin-to-mid gauge, uses less electricity per part, handles reflective metals like copper and brass, and requires less maintenance than CO2. CO2 laser still holds an edge on non-metallic materials such as acrylic, wood, and rubber. If your work is metal, fiber laser is the right technology.
Quick Answer: Fiber Laser Is the Modern Standard for Metal
For metal cutting, fiber laser is the current industrial standard. It cuts faster, uses less energy per part, and handles reflective metals like copper and brass without the beam-absorption risk that makes CO2 lasers unreliable on those materials. Most metal fabrication shops have replaced CO2 equipment with fiber laser systems over the past decade.
The shift from CO2 to fiber laser happened across most metal fabrication shops in the 2010s, and it’s now largely complete. Fiber laser machines dominate the installed base for sheet metal cutting because the technology performs better on the materials those shops run, costs less to operate, and requires fewer alignment and consumable cycles to keep cutting.
That doesn’t mean CO2 laser is dead. There are still specific applications where CO2 holds a genuine advantage. But if someone is asking which technology to specify for a metal part, the answer is fiber laser in almost every case. The comparison below covers why, and where the exceptions live.
For Paragon specifically: we run fiber laser for all metal cutting work. If you’re sourcing a laser-cut metal part in Northern Kentucky or Greater Cincinnati, that’s the technology handling your material. See our laser cutting services page for more about what we can cut and the thicknesses we run.
How Fiber Laser Works
A fiber laser generates its beam by passing light through a doped fiber-optic cable, typically ytterbium-doped. The resulting wavelength, around 1,070 nanometers, is absorbed efficiently by metals. Beam delivery runs through a fiber cable directly to the cutting head, which means no mirrors to align and lower maintenance compared to CO2 systems.
The beam generation process is different from CO2 at a fundamental level. In a fiber laser, pump diodes excite the ytterbium ions in the doped fiber cable. Those ions release photons that bounce through the fiber, amplify, and exit as a focused, high-intensity beam at the cutting head. The whole process is solid-state. There’s no gas medium, no discharge tube, and no external optics between the generator and the cutting head.
The wavelength that comes out of a fiber laser is approximately 1,064 to 1,070 nanometers, in the near-infrared spectrum. This is a critical number. Metals absorb light at this wavelength very efficiently. That’s why fiber laser couples well to steel, stainless, aluminum, copper, and brass. The material takes the energy and converts it to heat at the cut zone without needing the high power levels a longer-wavelength CO2 beam would require to achieve the same result.
Beam delivery through a fiber cable has practical production benefits. The cable routes from the resonator to the cutting head without mirrors. No mirror mounts to clean and align. No periodic beam path adjustments after maintenance or machine relocation. The head receives a consistent beam regardless of its position on the X-Y gantry, which means cut quality is more uniform across large sheets. Maintenance intervals for fiber laser heads and nozzles are straightforward compared to the optics maintenance schedule a CO2 system demands.
Power levels in modern production fiber lasers range from about 1 kW for light sheet work up to 20 kW or more for heavy plate. Higher power means faster cut speeds at greater thicknesses and the ability to run thicker material. A mid-range fiber laser at 4 to 6 kW covers the majority of industrial sheet metal and structural plate work.
How CO2 Laser Works
A CO2 laser produces its beam through a gas discharge in a tube filled with carbon dioxide, nitrogen, and helium. The wavelength, around 10,600 nanometers, is absorbed well by non-metals like acrylic and wood but less efficiently by bare metal. Beam delivery requires a series of mirrors that need periodic alignment and replacement.
In a CO2 laser, an electrical discharge excites a mixture of gases, most commonly carbon dioxide, nitrogen, and helium. The excited molecules release photons at a wavelength of approximately 10,600 nanometers, in the far-infrared spectrum. That’s roughly ten times the wavelength of a fiber laser beam.
The longer wavelength matters for metal cutting. Metal surfaces are highly reflective at 10,600 nm compared to 1,070 nm. More of the CO2 beam bounces off rather than coupling into the material, so higher power levels are needed to achieve the same cut. This is why CO2 lasers require more electricity per part cut on metal than fiber lasers doing the same job. It’s also why reflective metals like copper and brass are genuinely hazardous to cut on a CO2 machine. The reflected energy can travel back up the beam path and damage the optics or the resonator itself.
Beam delivery for CO2 systems uses a series of mirrors, usually three to five, to route the beam from the resonator to the cutting head as the head moves across the table. Each mirror must be precisely aligned, kept clean, and periodically replaced. As the mirrors degrade or drift, cut quality changes. Shops that run CO2 machines budget time and cost for regular mirror inspections and alignments as part of their maintenance schedule.
CO2 is well-suited to non-metallic materials because the 10,600 nm wavelength is strongly absorbed by organics. Acrylic, wood, rubber, leather, fabric, and most plastics cut cleanly on CO2 with good edge quality and controlled heat-affected zones. Architectural signage shops, fabricators that work with mixed materials, and specialty industries that process non-metals are the groups most likely to still actively run CO2 equipment today.
Not sure what your part needs? See what metals can be laser cut.
Performance Comparison by Material
Fiber laser outperforms CO2 on virtually every metal: mild steel, stainless steel, aluminum, copper, and brass. CO2 still cuts mild and stainless steel acceptably but at lower speeds and higher energy cost. On non-metallic materials including acrylic, wood, rubber, and composites, CO2 retains an advantage because those materials absorb the longer wavelength more effectively.
| Feature | Fiber Laser | CO2 Laser |
|---|---|---|
| Best metals | Mild steel, stainless, aluminum, copper, brass, titanium | Mild steel, stainless (slower, higher power required) |
| Reflective metals (copper/brass) | Yes, handles well at production speeds | Problematic; back-reflection risk, poor coupling |
| Max steel thickness | 1 inch and beyond (varies by machine power) | Up to 1 inch (varies by machine power) |
| Cutting speed on thin sheet | Faster, especially at 14 gauge and below | Slower on the same gauge at equivalent power |
| Cutting speed on thick plate | Competitive; high-power fiber closes gap with CO2 | Comparable at thick sections; CO2 was once preferred |
| Power efficiency (wall-plug) | Higher, approximately 30-35% | Lower, approximately 10-15% |
| Common industrial use | Metal fabrication, structural parts, enclosures, plate work | Non-metals, signage, specialty engraving, older installations |
For mild steel, the comparison comes down to speed and cost per part. Fiber laser cuts faster at thin gauges because the shorter wavelength couples to the material more efficiently, requiring less power to achieve the same cut energy. At thick plate, the gap narrows, but modern high-power fiber lasers have largely closed the thickness range where CO2 once held a clear advantage on steel.
Stainless steel follows a similar pattern. Fiber laser handles it well across the typical production range and delivers cleaner edges on thin stainless than CO2 at the same feed rates. Stainless is one of the more common materials in enclosure work, food equipment, and architectural applications, so this matters in practice.
Aluminum presents a challenge for both technologies at thick sections because of its high thermal conductivity, but fiber laser couples to aluminum more efficiently than CO2. The result is better cut quality at production speeds, particularly on 1/4″ and thicker aluminum plate.
Copper and brass are where the technology difference is most significant. These materials reflect CO2 wavelength light very aggressively. The reflection risk is not just a quality issue; it’s a machine-safety concern. Fiber laser’s shorter wavelength is absorbed much more efficiently by copper and brass, allowing consistent, reliable cutting without the back-reflection problem. If your application involves copper bus bar, brass fittings, or similar materials, fiber laser is the only practical choice.
Speed, Operating Cost, and Efficiency
Fiber laser cuts thin sheet at higher speeds than CO2 and uses significantly less electricity per hour of operation. Maintenance costs are also lower because there are no gas fill cycles, no mirror alignment intervals, and longer diode service schedules. For a production shop cutting parts all day, those differences accumulate into meaningful cost per part advantages.
Wall-plug efficiency is the ratio of input electrical power to output beam power. Fiber lasers convert roughly 30 to 35 percent of their electrical input into usable beam power. CO2 lasers run at roughly 10 to 15 percent efficiency. On a shop floor running full-time, the difference in electricity cost is real. A 6 kW fiber laser running 10 hours a day uses significantly less power than a 6 kW CO2 laser doing the same workload, because the CO2 machine requires more total energy input to generate that output beam power.
Gas consumption is another factor. CO2 lasers require periodic refills of the laser gas mixture in the resonator tube. The cost and logistics of managing that gas supply are ongoing. Fiber lasers have no comparable requirement. The assist gases used at the cut head (nitrogen, oxygen, air) are the same for both technologies, so that part of the operating cost is similar.
Maintenance intervals favor fiber laser. CO2 optics need regular cleaning and periodic replacement. Mirror mounts need alignment checks. The discharge tube has a finite service life. Fiber laser systems have fewer components in the beam path and more robust, longer-lived laser diodes. The result is less scheduled downtime and lower consumables expense over the life of the machine.
For parts pricing, operating cost eventually flows through to the customer. A shop running fiber laser can quote thin-gauge metal cutting at competitive rates partly because the machine runs more efficiently. That’s one reason the industry standard moved to fiber laser for metal work.
When CO2 Still Has an Advantage
CO2 laser still holds an edge when cutting thick non-metallic materials: acrylic, wood, rubber, composites, and fabrics. Some specialty signage and architectural shops keep CO2 equipment specifically for those materials. For a metal fabrication shop focused on structural parts, enclosures, and industrial components, CO2 laser is largely replaced by fiber in active production use.
The CO2 wavelength is absorbed strongly by organic materials. Acrylic cuts with a polished edge on CO2 that is difficult to replicate on fiber laser. Wood, MDF, leather, rubber, and certain technical fabrics all process well on CO2 because the longer wavelength drives the ablation mechanism those materials respond to. For a shop that runs a significant volume of non-metallic cutting alongside metal, a CO2 machine still makes sense as a dedicated non-metals tool.
Engraving is another area where CO2 is common. Surface engraving on materials like anodized aluminum, wood, and many plastics produces better results on CO2. The longer wavelength interacts with coated and non-metallic surfaces in a way that gives clean, high-contrast marks without the beam penetrating deeply into the base material.
Thick non-metallic composites and specialty industrial materials, such as gasket stock, sealing materials, and some technical textiles, are processed on CO2 because the thermal mechanism matches how those materials respond to the beam. Fiber laser’s shorter wavelength can cause charring, cracking, or unclean edges on materials that CO2 handles well.
For purely metal fabrication work, though, CO2 is not the choice. The comparison in every meaningful production dimension, including speed on thin sheet, energy cost, reflective metal capability, and maintenance burden, comes out in favor of fiber laser for a shop running mild steel, stainless, and aluminum day to day.
For more context on how laser cutting stacks up against other metal cutting processes, see our comparisons of laser cutting vs waterjet cutting and plasma cutting vs laser cutting.
Laser Cutting Quotes from Paragon Metal Fabricators
Paragon runs fiber laser cutting for all sheet metal and plate work at our Erlanger, KY facility. Send a drawing and we’ll quote your parts. Northern Kentucky and Greater Cincinnati customers, call +1-800-467-0121 or use the contact form.
Frequently Asked Questions
Does Paragon use fiber laser or CO2 laser?
Paragon Metal Fabricators uses fiber laser cutting for all metal cutting work. Fiber laser provides faster cut speeds on the gauges and materials we run daily, handles reflective metals reliably, and delivers consistent edge quality across mild steel, stainless, and aluminum. All laser cutting at our Erlanger, KY facility is fiber laser.
Can fiber laser cut copper and brass?
Yes. Fiber laser cuts copper and brass reliably at production speeds. These materials are highly reflective at the CO2 wavelength, which makes CO2 laser cutting on copper and brass unreliable and potentially damaging to the machine’s optics. Fiber laser’s shorter wavelength couples efficiently to reflective metals, so copper bus bar, brass sheet, and similar materials are standard fiber laser applications.
Which laser type cuts stainless steel better?
Fiber laser cuts stainless steel better in most production situations. It cuts faster at thin-to-mid gauge, produces cleaner edges, and handles the material with less heat input at typical industrial thicknesses. CO2 can cut stainless steel but requires more power and runs slower at equivalent gauges. For production stainless work, fiber laser is the right choice.
Is fiber laser faster than CO2 for cutting mild steel?
Yes, fiber laser is faster than CO2 for cutting mild steel, particularly at thin gauges (14 gauge and below). At thicker plate (1 inch and above), the speed difference narrows as higher power levels are required on both technologies, but fiber laser remains competitive at most production thicknesses. The efficiency advantage of fiber laser also means lower operating cost per part regardless of speed.
Reviewed by the Paragon Metal Fabricators engineering team, Erlanger, KY.
Paragon runs fiber laser cutting for all production sheet metal and plate work. Sources: TRUMPF (fiber vs CO2 comparison); IPG Photonics (fiber laser technology). Last updated October 2026.