Acousto-optic figure of merit of TeO2 for circularly polarized light

Abstract

The intensity of the diffracted light in an optically active crystal by anisotropic Bragg diffraction has been observed to depend strongly on the polarization condition of the incident light. The acousto-optic figure of merit for this type of crystal, therefore, should be measured under careful selection of the polarization and geometrical condition of the incident light. The figure of merit Me(p2n6/ρv3) of a TeO2 crystal for the slowest shear sound wave propagation using circularly polarized incident light was found to be 1200 × 10−18 sec3/g at 6328 Å rather than 793 × 10−18 sec3/g, as was previously reported by using arbitrarily polarized light. The previous measurement does not give a correct value of Me, according to the theory given above.

Piezooptic coefficients and acoustooptic efficiency of TGS crystals

“…This value is much smaller than that typical for the best AO materials such as paratellurite [25], HgCl 2 [26] and Sn 2 P 2 S 6 [27] crystals, or some chalcogenide and ferroelastic crystals (see Refs. [28,29]).…”

Anisotropy of the acousto-optic figure of merit for LiNbO_3 crystals: isotropic diffraction

“…3c, d) represents a combined effect of the extreme AW slowness and the high EEC value, which both occur at To test the results of our analysis, we make a comparison with the available experimental data (see Refs. [13,26]). As seen from Table 2, some of our results agree well with the experimental data (items #1-3).…”

Anisotropy of acoustooptic figure of merit for TeO2 crystals. 2. Anisotropic diffraction

“…where 1 A and 2 A are the amplitudes of the coupled waves, and the asterisk indicates complex conjugating. The coupling coefficient is given by the relation [5] 2 2 1 2 * (pe) 4 cos…”

“…Since TeO 2 is an optically uniaxial crystal with a large natural birefringence, anisotropic types of AO interactions can also be implemented in this material. For example, it is known that the anisotropic AO interactions yield in the AOFM equal to 15 3 1200 10 s /kg   for the circularly polarized incident wave [2] and to 600 15 10   -800 15 3 10 s /kg   for the linearly polarized incident wave [2,3]. Thus, the anisotropic AO diffraction can also be highly efficient in different crystals, in particular in the paratellurite.…”