| 摘要 |
It is an object of the present invention to provide a light source unit that can supply bright light efficiently. The light source unit includes a light emitting unit (201) that emits light, a phase plate (204;404) that polarizes the light from the light emitting unit (201) to produce a first polarized light and a second polarized light that is polarized in a different direction with respect to the first polarized light, a reflecting-type polarizing plate (205) that transmits the first polarized light and reflects the second polarized light; and a reflector (202;302;502) that is provided near both the light emitting unit (201) and the phase plate (204;404), and reflects back a third light, which is a portion of the first polarized light and that passes through the phase plate (204,404), to the phase plate (204,404). <??>The invention also provides a light source unit in which an evanescent coupling is used. <IMAGE> |
