| 摘要 |
A polarization-selective holographic element having first and second holographic layers, each holographic layer including holograms comprising a plurality of fringes which are recorded with light having a first wavelength lambda 1. The holographic optical element transmits a first component of light having a second wavelength lambda 2 without diffraction and diffracts a second component of the light having the second wavelength by a selected angle. The holograms have a high diffraction efficiency and are recorded with beams making angles sigma 1 and sigma 2 with a normal to the surface of the holographic layers, where ¦ theta 2- theta 1¦=¦ sigma 2- sigma 1¦=2 alpha , lambda 2/(sin theta 1+sin theta 2)= lambda 1/(sin theta 1+sin theta 2), and theta 1 and theta 2 are the incident and diffracted angles of the second component of the light having the second wavelength.
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