波長掃引光源および光断層画像化装置
- 专利权人:
- 富士フイルム株式会社
- 发明人:
- 日色 宏之
- 申请号：
- JP2006141571
- 公开号：
- JP4999147B2
- 申请日:
- 2006.05.22
- 申请国别(地区):
- JP
- 年份:
- 2012
- 代理人:
- 摘要：
PROBLEM TO BE SOLVED: To sweep over wavelength in a wide wavelength band by effectively utilizing the rotation angle of a rotating optical deflecting means.
SOLUTION: The light emitted from a semiconductor laser medium 211 is made incident into a polarized beam splitter 215 by shifting an optical path so that an incident position at which incident into a polygon mirror 213 follows the rotation direction of the polygon mirror 213 by a prism 202. An (s) polarization reflected at right angles becomes a circularly polarized light by transmitting through a 1/4 wavelength plate 216, and is made incident into the polygon mirror 213. The light reflected at the polygon mirror 213 becomes a (p) polarization by transmitting through the 1/4 wavelength plate 216 again, and made incident into a diffracting grating 214 by transmitting through the polarized beam splitter 215. A returning light scattered to the incident direction by the diffracting grating 214 returns through the inverse optical path to the semiconductor laser medium 211. Since the polygon mirror 213 rotates and the wavelength of the returning light changes at constant periods, a laser beam La swept over at the constant period is emitted from a light source unit 210.
COPYRIGHT: (C)2008,JPO&INPIT
- 来源网站：
- 中国工程科技知识中心
