Accuracy calibration of birefringence measurement systems
A measurement system, a technique for birefringence, applied in the field of systems of birefringence characteristics
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[0027] figure 1 The main optical elements of a system that can be calibrated according to the invention are described. These elements include as light source 20 a HeNe laser at a wavelength of 632.8 nanometers (nm). Beam "B" emanating along the optical path from the light source has a cross-sectional area or "spot size" of approximately 1 millimeter (mm).
[0028] Source beam "B" is directly incident on polarizer 22 whose polarization direction is oriented at +45° with respect to the baseline axis. High extinction polarizers are preferred, such as Glan-Thomson calcite polarizers. Polarizers 22 with stable precision and indexed rotators are also preferred.
[0029] The polarized light from the polarizer 22 is incident on the photoelastic modulator 24 ( figure 1 and 5 ) on the optical element 25. In a preferred embodiment, the photoelastic modulator (hereinafter "PEM") is a low birefringence version of Model PEM-90I / FS50 manufactured by Hinds Instruments, Inc., of Hillsbor...
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