The Differences Between Fiber Lasers and CO₂ Lasers

I. Laser Generation Principles

1. CO₂ Lasers

• Type: Gas laser

• Principle: The vacuum resonant cavity is filled with a gas mixture of CO₂, N₂, and He. High-voltage glow discharge excites the energy level transitions of gas molecules, producing a continuous laser beam via stimulated emission.

• Wavelength: 10.6 μm (Far-infrared)

• Optical Path: Transmitted via a series of metal reflecting mirrors. The optical path is open, requires regular calibration, and is sensitive to dust, temperature, and vibration.

2. Fiber Lasers

• Type: Solid-state fiber laser

• Principle: Light is emitted by a semiconductor pump source, exciting an internal Ytterbium (Yb)-doped fiber to produce stimulated emission. This is amplified within the fiber resonant cavity to form a high-power laser beam.

• Wavelength: 1.064 μm (Near-infrared)

• Optical Path: Transmitted directly to the cutting head via a flexible optical fiber. The optical path is fully enclosed, maintenance-free (no calibration needed), and highly stable.

II. Operating Cost Comparison (Based on 3kW Models)

1. Electricity Cost Electro-optical conversion efficiency is the core difference here:

• CO₂ Laser (3kW): Electro-optical conversion efficiency is 10%–15%. Actual power consumption of the whole machine: ≈ 18–25 kW·h/hour. Assuming an industrial electricity rate of 1 RMB/kWh: Electricity cost ≈ 18–25 RMB/hour.

• Fiber Laser (3kW): Electro-optical conversion efficiency is 30%–40%. Actual power consumption of the whole machine: ≈ 7–9 kW·h/hour. Assuming an industrial electricity rate of 1 RMB/kWh: Electricity cost ≈ 7–9 RMB/hour.

Conclusion: The electricity cost of a fiber laser is only about 1/3 of that of a CO₂ laser.

2. Maintenance and Consumable Costs

• CO₂ Lasers (High Cost):

  • Essential consumables: Laser gases, vacuum pump oil, water chiller filters, multiple reflecting mirrors, and focusing lenses.

  • The optical path is prone to deviation and requires regular manual calibration.

  • Laser source lifespan: ≈ 8,000–12,000 hours.

  • Annual maintenance + consumable costs for a 3kW model: Typically 10,000–20,000+ RMB.

• Fiber Lasers (Extremely Low Cost):

  • Main consumables: Only cutting head protective windows and copper nozzles, with minimal consumption.

  • No laser gases required, no reflecting mirrors, and no optical path calibration.

  • Laser source lifespan: ≈ 100,000 hours.

  • Annual maintenance cost for a 3kW model: Typically 1,000–3,000 RMB.

3. Comprehensive Operating Cost

Conclusion: The comprehensive hourly operating cost of a CO₂ laser is approximately 2.5 to 3 times that of a fiber laser.

III. Cutting Efficiency Comparison (Metal Materials Only, 3kW)

Using common carbon steel and stainless steel as standard benchmarks:

• Thin Plates (1–3mm):

  • Speed: Fiber is extremely fast, 2–3 times faster than CO₂.

  • Quality: Fiber has a narrower kerf, minimal thermal deformation, and brighter cut sections.

  • Piercing: Fiber has a much shorter piercing time, offering a massive advantage in batch production.

• Medium-Thick Plates (4–8mm):

  • Speed: Fiber is still 30%–60% faster.

  • Quality: Fiber’s section perpendicularity and smoothness are generally superior to CO₂. Fiber cutting is more stable with less dross.

• Thick Plates (10–16mm):

  • Speed: Fiber is still slightly faster than CO₂.

  • Quality: Fiber produces a narrow kerf and small heat-affected zone. CO₂ yields a slightly more uniform section texture on thick plates, but the advantage is marginal.

  • Piercing: Fiber is faster and more stable.

• Highly Reflective Metals (Aluminum, Copper, Brass):

  • Fiber Laser: Can cut stably.

  • CO₂ Laser: Basically incapable of processing; highly prone to reflection, which damages the laser source.

In Short: When it comes to cutting metal, fiber lasers comprehensively and significantly outperform CO₂ lasers in efficiency.

IV. Applicable Scenarios

CO₂ Lasers are suitable for:

1. Primarily cutting non-metals: Acrylic, PVC, wood, leather, fabric, plastic, foam, etc.

2. Advertising signage, crafts, display props, and model making.

3. Applications requiring high-quality edges for non-metal materials.

4. Occasionally handling some medium-thick metals, without requiring high-speed processing. Note: CO₂ is no longer mainstream for metal processing; its advantage lies almost entirely in non-metals.

Fiber Lasers are suitable for:

1. Professional sheet metal processing: Chassis, electrical cabinets, hardware, kitchenware, and lighting fixtures.

2. Automotive parts, hardware accessories, and precision metal components.

3. Cutting highly reflective materials like aluminum, copper, and stainless steel.

4. High-speed, mass-production blanking.

5. Factories with average workshop environments and higher dust levels.

6. Businesses prioritizing long-term energy savings, low maintenance, and high machine uptime. Note: Fiber is currently one of the most mainstream configurations for metal processing.

V. Summary (3kW Version)

1. Principles: CO₂ is a gas laser (10.6 μm) excited by discharge; Fiber is a solid-state laser (1.064 μm) pumped by semiconductors, offering a much more stable optical path.

2. Costs: Fiber lasers save about 2/3 in electricity costs, and maintenance costs are only 1/5 to 1/10 of CO₂ lasers. The long-term cost advantage is overwhelmingly significant.

3. Efficiency: In metal cutting efficiency, fiber completely crushes CO₂. It is faster, yields better cut sections, and can cut aluminum and copper. CO₂ has almost no competitive edge here.

4. Scenario Selection:

   • Cutting non-metals (acrylic, wood, fabric, etc.) → Choose CO₂.

   • Primarily cutting metals (carbon steel / stainless steel / aluminum / copper) → Must choose Fiber.

5. Industry Trends: In the metal cutting market, fiber has completely replaced CO₂. CO₂ is now reserved solely for the non-metal processing sector.