when a volume holographic grating is readout under off-bragg condition, determining the direction of the diffracted beam is an important issue in the coupled-wave theory of volume gratings.
体全息光栅的读出偏离布拉格条件时,衍射光方向的确定是体光栅耦合波理论中的一个重要问题。
pdlc volume holographic grating has much higher diffraction efficiency than normal grating, because it can focus the diffraction light to the non zero band.
pdlc体全息光栅可使光栅的衍射能量集中到非零级的衍射级次上,大大提高衍射效率。
one scheme of wavelength demultiplexing with multiple volume holographic grating filter and the technique difficulties to be resolved while being put into practice are put forward.
提出了实现多重体全息光栅波长解复用的实验方案和实用化要解决的问题。