| 摘要 |
An optical element includes a substrate, a magnetostrictive film arranged on the substrate, a film thickness of the magnetostrictive film varying in accordance with intensity of a magnetic field, and a reflection film arranged on the magnetostrictive film and reflects light. An optical apparatus includes a stage including a holder provided with plural holes arranged in a carrying surface thereof for carrying an optical element provided with a magnetostrictive film arranged on a substrate, a film thickness of the magnetostrictive film varying in accordance with intensity of a magnetic field, and a reflection film arranged on the magnetostrictive film and reflecting light, plural magnetic field generation parts embedded in the plural holes, and a control mechanism for controlling the magnetic field generated by each of the plural magnetic field generation parts, and controlling the film thickness of the magnetostrictive film.
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