| http://www.w3.org/ns/prov#value | - A method for controlling a saturable absorber according to the present invention is a method for controlling a saturable absorber that is used for an extreme ultraviolet light source device that generates extreme ultraviolet light, the method having the steps of: circulating the saturable absorber in a saturable absorber cell in which a laser beam for generating the extreme ultraviolet transmits;
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