There are a few different types.
We have diode lasers that are about 25cm x 15cm x 8cm, although the laser diode inside is about the size of a postage stamp (the rest is lenses and electronics).
We have Nd:YAG lasers, which are about the size of a desktop computer.
And we have copper vapour lasers that are about 1.5m x 0.5m x 0.5m.
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