Topic
Schaefer–Bergmann diffraction
About: Schaefer–Bergmann diffraction is a research topic. Over the lifetime, 5 publications have been published within this topic receiving 21 citations.
Papers
TL;DR: In this article, a new type of Schaefer-Bergmann diffraction patterns originated from the abnormal Bragg reflection phenomenon in anisotropic media has been demonstrated using α quartz and monoclinic Pb 2 MoO 5 crystals.
Abstract: A new type of the Schaefer-Bergmann diffraction patterns originated from the abnormal Bragg reflection phenomenon in anisotropic media has been demonstrated using α quartz and monoclinic Pb 2 MoO 5 crystals. The wave-vector direction of the diffracted light has been expressed in analytical equations for the general cases in uniaxial crystals as a function of those of the incident light beam and the acoustic wave, on the basis of the simple pseudo momentum conservation relation. The shape of the abnormal patterns can be determined using the equations and the known data on the acoustic and the optical wave-vector surfaces, and calculated patterns for α quartz are in good agreement with the observed ones. The equations predict that a small difference appears in the shape of the patterns between two cases where the polarization planes of the incident optical beams are orthogonal with each other, and this fact has been well confirmed by the present experiment.
11 citations
TL;DR: A novel technique for measuring the relative photoelastic coefficients using Schaefer-Bergmann diffraction is introduced and applied to fused silica and α-BaB2O4 and verified with results presented in this paper from the established Dixon method.
Abstract: A novel technique for measuring the relative photoelastic coefficients using Schaefer-Bergmann diffraction is introduced and applied to fused silica and α-BaB2O4. The measurements of fused silica agree with the accepted values to within 0.4%, and the α-BaB2O4 measurements are verified with results presented in this paper from the established Dixon method.
9 citations
TL;DR: In this article, a new method for measuring the ratios of photoelastic coefficients using Schaefer-Bergmann diffraction was presented, which was demon-strated for isotropic fused silica and the trigonal crystal α -BaB2O4.
4 citations
27 May 2014
TL;DR: In this paper, the elastic stiffness coefficients of the trigonal, non-piezo-electric crystal α−BaB2O4 were measured using both resonant ultrasound spectroscopy and Schaefer-Bergmann diffraction patterns.
Abstract: We utilized both resonant ultrasound spectroscopy (RUS) and Schaefer-Bergmann diffraction patterns (SBDP) to measure the elastic stiffness coefficients of the trigonal, non-piezo-electric crystal α−BaB2O4. RUS determines the elastic coefficients of a sample by matching measured resonant frequencies to a model of resonances. SBDP deduces the elastic coefficients by fitting the measured shape of the acousto-optic diffraction pattern to an acoustic slowness surface cross-section. We present our measured elastic coefficients of α−BaB2O4 from both RUS and SBDP experiments.
3 citations
TL;DR: In this paper, it was shown that the inhomogeneous illumination of the Schaefer-Bergmann diffraction patterns obtained by crystals with high symmetry or with weak anisotropy is due to interference phenomena in the diffuse field.
Abstract: The origin of the Schaefer-Bergmann diffraction patterns is interpreted by the concept of a diffuse acoustic field occuring in high Q-factor crystals like the sound field in large low-loss auditoriums. It is shown that the inhomogeneous illumination of the patterns obtained by crystals with high symmetry or with weak anisotropy is due to interference phenomena in the diffuse field.
1 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2018 | 1 |
| 2015 | 1 |
| 2014 | 1 |
| 1983 | 1 |
| 1971 | 1 |