POLARIZATION IN CARY MODEL 14 INSTRUMENTS AND ITS EFFECT ON TRANSMITTANCE MEASUREMENTS OF ANISOTROPIC MATERIALS
Abstract
In our laboratory Cary Model 14 instruments are used to measure the transmittance of optical components. These instruments have been found to have polarization characteristics that affect the transmittance values of anisotropic or dichroic materials. A study was made to determine the extent of polarization in the instruments and its variation with wavelength. Type HNP'B, HN22, and HR Polaroid polarizers and Polacoat polarizing filters, formula 105 UV, were used to cover the wavelength range from 0.2 to 2.5 microns. A Bausch and Lomb 90-8 hot mirror was used to protect the HR Polaroid polarizers. Data points were obtained every 10, 20, or 50 A using a Datex digital system. In the ultraviolet the degree of polarization is fairly constant from 3000 to 4000 A. In the visible the degree of polarization shows some variation with wavelength. In the near infrared the variation of the degree of polarization with wavelength is large, showing sharply defined maxima at approximately 0.77, 0.97, and 1.27 microns. These wavelengths correspond to the calculated positions of the Wood anomalies. The spectral transmittance of optical quality sapphire, a uniaxial crystal, cut at 45, 60, and 90 degrees to the c-axis, showed undulations for certain orientations of the privileged directions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1967
- Accession Number
- AD0824440
Entities
People
- Allen L. Olsen
- Lawrence W. Nichols
- Marian E. Hills
Organizations
- Naval Air Weapons Station China Lake