| 摘要 |
A plurality of prisms each has side surfaces that forms an angle of 90 degrees functions as a wavelength filter, and the prisms are arranged so that the angles of 90 degrees of adjacent prisms are pointing in opposite directions so as to form one wavelength separation filter by bonding the prisms together. With this configuration, a path of light output from the wavelength separation filter is displaced as an orientation of the wavelength separation filter changes; however, the path of the light after displacement is not inclined to but parallel to the path of the light before displacement.
|
