OPTICAL COMPONENT
Protective Lens
Protective lenses shield the expensive focusing optics from cutting debris and spatter. Proper lens management is essential for consistent beam quality.
Lens Specifications
| Parameter | Standard Lens | UHDT Lens |
|---|---|---|
| Material | JGS1 Fused Silica | JGS1 Fused Silica |
| AR Coating | Double-sided AR, 1050–1090 nm | Double-sided AR, 1050–1090 nm |
| Transmittance | ≥99.8% over 1050–1090 nm | ≥99.8% over 1050–1090 nm |
| Reflectance | <0.2% over 1050–1090 nm | <0.2% over 1050–1090 nm |
| Coating Absorption | ~1.3 ppm @ 1064 nm (measured after coating) | ~1.3 ppm @ 1064 nm (measured after coating) |
| Damage Threshold | 10 J/cm² | 20 J/cm² |
| Usable Life (6kW) | ~200 hours | ~500 hours |
| Typical Cost | $40-80 | $80-150 |
Inspection & Replacement
- Daily visual inspection — Use bright backlight; any spots or haze = replace
- Lens cleaning — Only use optical-grade materials; never touch surface
- Storage — Keep in sealed container with desiccant; never stack lenses
ENGINEERING TIP
The 70% rule: Replace the protective lens when its transmission drops to 70% of the original value. A drop from 99.5% to 99.0% may seem small, but even a 0.5% absorption increase at 10kW means 50W of heat deposited directly into the lens — enough to cause thermal runaway and catastrophic failure within minutes.
📖 Related Blog Articles
- Why Laser Heads Overheat — Causes, diagnosis & solutions for overheating laser heads
- Laser Cutting Consumables Guide — Complete troubleshooting guide for nozzles, lenses & ceramic rings
Need Technical Support or Pricing?
Our engineering team provides remote guidance and setup support for high-power fiber laser systems. Get tailored solutions for your specific cutting requirements.
Need a Stable Fiber Laser Cutting Solution?
Explore Muxi High Power Laser Solutions →