⚡ Quick Answer: Why Fiber vs CO₂?
Metals: Fiber (1070nm) absorbs 30-45% vs CO₂ 5-10% → Fiber wins | Organics: CO₂ (10.6μm) absorbs 90-95% → CO₂ only
Understand why different laser wavelengths work better for different materials. Calculate absorption, reflectance, and get laser type recommendations.
Select material and wavelength to see absorption analysis.
| Material | Fiber (1070nm) | CO₂ (10600nm) | Green (532nm) | Best Laser |
|---|---|---|---|---|
| Mild Steel | 35% | 5% | 42% | Fiber |
| Stainless Steel | 32% | 8% | 38% | Fiber |
| Aluminum | 8% | 3% | 15% | Fiber (high power) |
| Copper | 5% | 2% | 40% | Green / Blue |
| Wood | 25% | 95% | 30% | CO₂ only |
| Acrylic | 5% | 95% | 8% | CO₂ only |
Values at room temperature for ground/machined surfaces. Absorption increases significantly at elevated temperatures.
CO₂ laser wavelength (10.6μm) is strongly absorbed by organic materials - wood and acrylic absorb ~95% of the energy. Fiber laser wavelength (1.07μm) passes through or scatters in these materials with only ~5-25% absorption. The 10.6μm wavelength excites molecular vibrations in polymers and organic compounds, causing efficient vaporization. This is why CO₂ is the only practical choice for cutting wood, paper, fabric, leather, and most plastics.
Choose fiber vs CO₂ for your application
Calculate absorbed power density
Absorption affects weld penetration
Absorption affects cutting speed
Complete comparison of laser types
Tips for copper, brass, aluminum
Note: Absorption values are approximate for typical industrial conditions. Actual absorption varies with surface finish, temperature, alloy composition, and beam angle. For highly reflective materials, consider starting with lower power and back-reflection monitoring.
Calculate power density (W/cm²) for optimal cutting performance
Estimate kerf width and path compensation for accurate part dimensions
Determine required laser power based on material and thickness
Calculate cycle time, production capacity, and time breakdown
Calculate gas consumption rates and monthly operating costs
Get optimal cutting speed for any material/power/gas combination