| http://www.w3.org/ns/prov#value | - In the first place, an optical system having a resonator in accordance with the present invention is an optical system having at least one optical part other than mirrors in a stable resonator, wherein said optical system is provided with, on at least one point in the stable resonator, an aperture having a circular hole with a diameter 1 to 10 times the beam diameter at each point.
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