Not every laser module produces the same output level. The key is the KTP crystal (KTiOPO4). A crystal with good efficiency produces a more powerful beam than a less-efficient crystal using the same current. You can compare this with two gasoline engines, one more efficient than the other. Although they both burn the same amount of gas, the more efficient engine produces more horsepower and is therefore more valuable. The more efficient KTP crystals are likewise more valuable and cost more. Plus there has to be larger heat sinks, lenses, filters, switches and heavier duty supporting components in the laser to handle the higher energy output.
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