K. Veerabhadra Rao and T. S. Narasimhamurty, "A New Technique to Study Photoelastic Dispersion in Cubic and Noncubic Crystals," Appl. Opt. 9, 155-159 (1970)
A new technique employing a Soleil-Babinet compensator is described to study the photoelastic behavior of crystals at various wavelengths. The photoelastic dispersion is reported on an isometric crystal, sodium chloride, and a birefringent crystal, barite, for some typical orientations. The values of the stress birefringence obtained at different wavelengths are compared with the values given in the literature. The merits of the present technique over the previous methods are discussed.
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Stress parallel to [100].
The values of Cλ are interpolated from a graph. In the spectral region studied, Cλ for NaCl is negative. Length of NaCl prism = 10.70 mm; thickness of NaCl prism = 5.05 mm. Breadth of NaCl prism = 5.60 mm.
Table II
Observations and Results for Barite When Light is Passed Along X Axis
Stress parallel to [001].
The values of Cλ are interpolated from a graph. In the spectral region studied Cλ is positive. Length of barite prism = 10.33 mm; thickness of barite prism = 4.44 mm. Breadth of barite prism = 5.15 mm.
Table III
Observations and Results for Barite When Light is Passed Along Z Axis
Stress parallel to [100].
The values of Cλ are interpolated from a graph. In the spectral region studied, Cλ is negative. Length of barite prism = 9.93 mm; thickness of barite prism = 4.49 mm. Breadth of barite prism = 4.97 mm.
Stress parallel to [100].
The values of Cλ are interpolated from a graph. In the spectral region studied, Cλ for NaCl is negative. Length of NaCl prism = 10.70 mm; thickness of NaCl prism = 5.05 mm. Breadth of NaCl prism = 5.60 mm.
Table II
Observations and Results for Barite When Light is Passed Along X Axis
Stress parallel to [001].
The values of Cλ are interpolated from a graph. In the spectral region studied Cλ is positive. Length of barite prism = 10.33 mm; thickness of barite prism = 4.44 mm. Breadth of barite prism = 5.15 mm.
Table III
Observations and Results for Barite When Light is Passed Along Z Axis
Stress parallel to [100].
The values of Cλ are interpolated from a graph. In the spectral region studied, Cλ is negative. Length of barite prism = 9.93 mm; thickness of barite prism = 4.49 mm. Breadth of barite prism = 4.97 mm.