By Lan Xinju
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Example text
Reducing d while increasing the length L can reduce the half-wave voltage. But two pieces of crystal have to be used for this method and so the structure will be complicated. Furthermore, the requirements on their dimension processing are extremely high. 8 nm). So, in general, no one will adopt the transverse mode of modulation for the KDP class crystal. In actual application, as both the GaAs crystal (no = ne ) of the 43m group and the LiNbO3 crystal (electric field applied along the x-axis, clear along the z direction) of the 3m group are free from the influence of the natural birefringence, the transverse electro-optic modulation is adopted very often.
Its εmax = 6 (in the wave band of visible light and near-infrared light). A stage one digital polarizer is constructed from the above-mentioned electro-optic crystal and birefringence crystal. The incident linearly polarized light occupies one of two “addresses” ∗ o light (ordinary light). ∗∗ e light (extraordinary light). 2 The electro-optic modulation 33 according to whether a half-wave voltage is or is not applied on the electro-optic crystal, representing state “0” and state “1”, respectively.
Ex’ x’ z y’ Ey’ −y’ x x’ y a Δϕ=0 Fig. 2 electro-optic intensity modulation There are two cases of implementing electro-optic modulation using the Pockels effect. For one, the electric field applied on the crystal is basically uniform spatially but variable temporally. When a beam of light has gone through the crystal, an electrical signal varying with time can be converted into an optical signal, with the information to be transmitted embodied by the intensity or phase variation of the optical wave.