| 摘要 |
Provided is a phase difference plate which has a high durability and a wide band and which can be easily manufactured at a low cost. Its manufacturing method is also provided. The phase difference plate is a glass plate having a thickness not smaller than 0.1 mm and not greater than 5 mm. While a laser beam is focused and applied onto the glass plate, the glass plate or the laser beam is scanned so as to form a tensile stress distribution along the scan direction and induce uniaxial birefringence. Thus, the phase difference plate can have a retardation value in a range from 80 to 450 nm measured by using an incident light of wavelength 540 nm. Furthermore, the retardation value measured by using an incident light of wavelength 486 nm is in a range from 100 to 150 nm and the retardation value measured by using an incident light of wavelength 656 nm is in a range from 130 to 200 nm.
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