| 主权项 |
1. A phase difference element, comprising a transparent substrate and a birefringent film in which tantalum oxide and titanium oxide are obliquely deposited on one surface of the transparent substrate,
wherein the birefringent film has a first photorefractive film and a second photorefractive film laminated to each other and having different oblique deposition directions, and a ratio of titanium atoms to a total of titanium atoms and tantalum atoms in the birefringent film is 4.0 atomic % or higher and 30 atomic % or lower. |
