WARNING
Zinc selenide lens, telescope and laser exit window
Soiled optics absorb laser radiation and can thus be destroyed. Broken or damaged
lenses release particles which cause serious damage to the health.
- Special care is required when handling, attaching and cleaning these elements.
- Do not exert non-uniform pressure.
- The metal passive reflectors and optics in the area of the beam guidance should be
cleaned regularly.
- Do not use tools or hard objects to clean the surface.
- Never touch the optics with your bare fingers.
- Never use cleaning tissues twice.
- Lenses with scratches or penetrations must not be used anymore!
2.9.3.1 Scratched or destroyed lens surface
Be aware that scratches in the coating may release small quantities of thorium, which may be harmful
upon inhalation or swallowing.
2.9.3.2 Thermal decomposition
Upon thermal decompositions, vapors of selenium oxide and zinc oxide are formed. Indicators for
thermal decomposition of ZnSe include deposits in the form of red or white powder and an unpleasant
odor.
Upon inhalation or swallowing there is danger of poisoning.
2.9.3.3 Broken lenses
When optical components of zinc selenide (ZnSe) are destroyed, toxic dusts and vapors are formed
which must not be inhaled. The dust can additionally cause irritations of the eyes, skin and respiratory
tract.
If a lens has been destroyed during operations, care is to be taken during removal and cleaning.
For first aid measures and handling of scratched or broken ZnSe lenses, see the material safety data
sheets by the manufacturer of the lenses.
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