Anisotropy of acousto–optic figure of merit in lithium tetraborate crystals

Piezooptic coefficients and acoustooptic efficiency of TGS crystals

“…It is important that our consideration has dealt with the AO interaction with the fast quasi-longitudinal acoustic wave. It is obvious that the interaction with slower quasi-transverse waves should lead to increasing AO figure of merit [31]. Moreover, since the TGS is a low-symmetry crystal, one can expect a large variety of geometries of AO interactions, among which there can be the geometries with higher elastooptic effect [32][33][34] and so with higher AO figures of merit.…”

“…However, the above AO figure of merit is still comparable or even higher than the corresponding parameters of the other crystals transparent in the ultraviolet spectral region, e.g. quartz, KDP, ADP or Li 2 B 4 O 7 [21,30,31]. It is important that our consideration has dealt with the AO interaction with the fast quasi-longitudinal acoustic wave.…”

Anisotropy of acousto-optic figure of merit in tetragonal crystals with accounting for non-orthogonality of acoustic eigenwave polarizations. 2. The cases of Li2B4O7 and TeO2 crystals

“…Note that accounting for the AW polarization nonorthogonality does not affect the relation for the EEC in the principal crystallographic planes, whenever the tetragonal symmetry groups and the case of anisotropic diffraction are considered. This type of diffraction in Li 2 B 4 O 7 and TeO 2 has been analyzed in the recent works [9,11], and the non-orthogonality effect has been properly considered. Therefore, in the present paper we will deal only with the isotropic type of AO diffraction.…”

“…It is highly resistant to a high-power optical radiation, with the damage threshold being equal to 40 GW/cm 2 [4,5]. The crystal is transparent in the UV spectral range down to 170 nm [5] and represents a promising AO material [6][7][8][9] for operating high-power short-wavelength optical radiation. As shown in our recent work [9], the maximal AOFM for the Li 2 B 4 O 7 crystals can reach the value 3.44×10 −15 s 3 /kg in the visible spectral range.…”

“…The crystal is transparent in the UV spectral range down to 170 nm [5] and represents a promising AO material [6][7][8][9] for operating high-power short-wavelength optical radiation. As shown in our recent work [9], the maximal AOFM for the Li 2 B 4 O 7 crystals can reach the value 3.44×10 −15 s 3 /kg in the visible spectral range. The maximum AOFM for the paratellurite crystals is equal to 1143.8×10 −15 s 3 /kg for the isotropic diffraction [10] and 750×10 −15 s 3 /kg for the anisotropic AO interactions that involve linearly polarized optical waves [11].…”