Figure 26: Angular dependence of diffraction
efficiency for a transmission HPDLC grating, illustrating angular bandwidth
for various and . Key parameters: (external), , = 633 nm, = 0.020,
(a) = 20 μm, = 0.026, (b) =16 μm,
= 0.034, (c)
= 10 μm, = 0.052,
and (d) = 6 μm,
= 0.088. 
