Thermal lensing

• Laser Window Degradation Before Burn Damage

  Oct 29, 2026

  Your laser protective window may look fine. There are no cracks, no clear burn marks, and no visible damage to the coating. But your laser cutting result becomes unstable. Welding quality gets worse. Or you have to increase laser power to get the same processing effect.   Why does this happen? The main reason is contamination. These tiny marks cannot be found by simple visual checks.   Optical Contamination: Tiny Deposits Cause Energy Loss When the laser works, small dust particles, smoke and oil residue will build up on the protective window. These deposits absorb or scatter part of the laser beam. Less laser energy reaches your material. The window does not need to look damaged to affect laser processing.   Thermal Lensing: Heat Changes the Laser Path The absorbed laser e...

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