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13.3.4. MIRRORS AND LENSES
Pay special attention when handling the lens holder to ensure the lens surface is not touched by
fingers or any other object.
Clean all lenses with acetone and optical paper.
During the marking process a volatilization of particles and fumes occurs on the surface of the product
being marked, which are absorbed by the extractor system. The problem in produced when these
particles form deposits on the lens surface. Deposits of particles on the lens may cause two different
problems:
A decrease in power due to lack of transparency in the lens.
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Lens damage when the deposited particles are burned by the laser.
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For these reasons, the lens should be cleaned periodically. Otherwise, it could become damaged and
the laser beam focusing distorted.
All optical materials used in the infrared range are very fragile and their maintenance requires extreme
care. These optical elements must be carefully handled and proper maintenance products must be used.
Below is a set of basic materials required to clean the lenses and mirrors:
Plastic tweezers.
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Lens cleaning paper.
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Pure acetone, never use water or soap.
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Ethanol or Methanol.
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13-7 •CLEANING THE LASER SYSTEM
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