| 摘要 |
The present invention relates to a light source having a light emitter structured to emit a light beam of linearly polarized light having a peak wavelength in a wavelength band, a beamsplitter having a first optical surface structured to reflect a first portion of the light beam and transmit a second portion of the light beam, the beamsplitter having an optical coating disposed on the first optical surface of the beamsplitter, the first optical surface structured to define a plane of incidence, characterized in that the optical coating has characteristic parameters F TE and F TM that are given for a range of angles of incidence and for wavelengths » within the wavelength band, wherein F TE is defined as the ratio of power transmittance and power reflectance for light waves with polarization direction perpendicular to the plane of incidence, and F TM is defined as the ratio of power transmittance and power reflectance for light waves with polarization direction parallel to the plane of incidence, and the parameters F TE and F TM exhibit the following property: either ( dF TE / d » > 0 and dF TM / d » < 0) or ( dF TE / d » < 0 and dF TM / d » > 0). |
