some small corrections. Co2 lasers emit at 10,600nm. mirrors for co2 lasers can be made from several different things such as copper, molybdenum, or silicon. sometimes mirrors are gold plated.
you actually have to be very careful about what kind of metals you're engraving. unexpected things become opaque, transmissive, or reflective at this wavelength.
i built this laser cutter. it has three mirrors that are used to deliver the IR from the tube through the focusing lens in the head and to the material being engraved or cut.
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