684349.fig.078a
(a)
684349.fig.078b
(b)
Figure 78: Diffraction efficiency as a function of incident angle for (a) - and (b) -polarized light. The data is for a HPDLC transmission grating with Λ 0.5 μm probed at 632.8 nm. The grating thickness is about 10 μm. A fit to coupled-wave theory yields (a) = 0.125 ( -polarization) and (b) = 0.048 ( -polarization). High side lobe indicates overmodulation.