Importance

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Abstract

An optical pulse stretcher includes a beam splitter separating laser light incident on an optical surface thereof into reflection laser light and transmission laser light, a holder fixing the beam splitter with the optical surface of the beam splitter inclined with respect to an optical path axis of the incident laser light, mirrors guiding the reflection laser light to the beam splitter, and a slide mechanism moving the beam splitter in a direction parallel to the optical surface. The slide mechanism includes a slide plate to which the holder is coupled, and a case which holds the slide plate in a movable manner in a slide direction with respect to a base plate on which the mirrors are arranged. The case includes a threaded hole having an internal thread formed on an inner circumference thereof. The slide plate includes a through hole at a position corresponding to the threaded hole.

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First Claim