The primary function of protective windows (cover slips) in fiber lasers is to protect the focusing lens from damage caused by debris and spatter during processing. Regularly replacing these protective windows ensures that processing accuracy requirements are maintained. Coating the window with a 1064 nm anti-reflective (AR) coating with a high damage threshold (>15 J/cm²) effectively increases light transmittance, reduces energy loss, and improves product quality. These windows are widely used in laser processing equipment, such as laser cutting and laser welding machines.
| Material | Fused silica |
| Diameter tolerance | ±0.05 mm |
| Surface accuracy | λ/4@ 633nm or λ/10@633nm |
| Surface quality(S/D) | 60/40 |
| Effective caliber | 90% |
| Edge reversal | <0.2*45° |
| Coating | 532nm&1064nm (customized upon request) |
| Common specifications | Φ18*2、φ21.5*2、φ25.4*2 (customized upon request) |
