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Deleted member 8382
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I everyday learn new things hereWell, in fact there isnt anything that 'stops' you from doubling it again, though i doubt that there are crystals that can handle doubling the pump wavelength AND the doubled result. 266 nm lasers are, however, made by doubling 1064 to 532, and doubling again to get 266.
Similarly, 1064 is tripled to 355 nm. This is commonly done by first generating 532 and combining that with the original 1064 (which is possible since they are exact doubles), although it is possible to triple directly to 355 using intracavity non linear optics as well.