Abstract. present the method for analyzing the anisotropy of acoustooptic figure of merit for optically uniaxial crystals and illustrate it on the example of crystalline paratellurite. This first part of the article deals with analysis of the isotropic acoustooptic interaction. The results of our calculations agree well with the experimental data known from the literature.
We suggest a new approach for analyzing spatial anisotropy of acoustooptic figure of merit (AOFM). The relations for the effective elastooptic coefficients and the AOFM are derived for all possible types of acoustooptic (AO) interactions in optically is otropic media, including non-solid-state and solid -state amorphous media, and crystals belonging to the cubic system. Our approach allows for finding the optimal geometries of AO interactions characterized by the highest AOFM for a given material. The analysis is carried out on the examples of cubic KBr and KAl(SO4)2×12H2O crystals which represent different subgroups of the cubic symmetry class. OCIS codes: 260.1180OCIS codes: 260. , 230.1040OCIS codes: 260. , 160.1050OCIS codes: 260. , 260.1960 http://dx.doi/org/10.1364/AO.99.099999 1.IntroductionAmong the parametric optical effects induced by external fields, such as electro-, magneto-, piezo-and acoustooptic (AO) ones [1,2], AO diffraction represents ma ybe the most frequently used effect. This phenomenon is utilized for deflecting and modulating of light, scanning of the optical beams, RF spectrum analyzing, Q-switching, etc. [3 -6]. It is well known that efficiency of the AO diffraction is d efined by the AO figure of merit (AOFM):where n , ef p and ρ denote respectively the optical refractive index, the effective elastooptic coefficient (EEC) and the density of an optical material, and v the velocity of the acoustic wave (AW). Although the 2 M parameter is scalar, it can reveal notable spatial anisotropy. This anisotropy is mainly influenced by the elastooptic tensor and the tensor of elastic stiffness coefficients, on the basis of which the AW velocities are determined. Anisotropy of the refractive indices contributes to the total spatial dependence of 2 M , too. Thus, the AO efficiency simulta neously depends on a number of constitutive coefficients of a given optical material. Searching for efficient materials for the AO diffraction is of a primary importance. Moreover, development of the methods for analyzing the anisotropy of AO efficiency for different geometries of AO interactions can solve a lot of materials science problems, since the anisotropy of the 2 M coefficient can yield in increasing AO efficiency for both well-known and new materials. As shown in our recent works [7,8], the anisotropy of AW velocities often plays a major role in the anisotropy of AOFM. In fact, it can result in extremely high 2 M coefficient, e.g., for one of the best AO materials, TeO2 crystal [9,10].It is obvious that the EEC and its anisotropy also contribute significantly to the AO efficiency. In particular, this contribution can become notable for the media where the AW velocities are almost isotropic (see, e.g., [11]). Unfortunately, no general method for analyzing the anisotropy of AO efficiency has been developed up to now. To our best knowledge, there have been a few relevant attempts, which are based on the anisotropies of the EEC [12] and the AW velocities [2]. A combined method has been suggested in Ref. [13,1...
We have revealed topological defects (TDs) of the angle of optical indicatrix (OI) orientation in a glass Li2B4O7 sample, which originate from the specific spatial distribution of optical birefringence caused by residual mechanical stresses. It has been found that the strength of TDs of the OI rotation angle is equal to ±1/2. Following from the experimental results, we have shown that the regions around the TDs of OI orientation are those of a 3D stressed state. We have formulated criteria for determining whether 2D or 3D distributions of the optical anisotropy parameters appear, based on the TDs of OI orientation. It has been shown that, in some particular cases, the regions with the TDs can testify the availability of a 2D stressed state. Besides, we have demonstrated experimentally that the TDs can appear for more than one projection in the case of 3D distributions of the OI parameters, which appear under bending of glass plates by a distributed load.
Abstract. We describe a gradient-index axicon based on twisting of crystals. We demonstrate that the focal length of the axicon can be efficiently operated by the torsion moment. The working analytical relations describing the focal length of the axicon and its dependence on different geometrical parameters as well as the torsion moment has been derived.
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