Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

A Precision Reflectometer

Not Accessible

Your library or personal account may give you access

Abstract

This reflectometer measures the principal angle of incidence θ¯ and the principal azimuth ψ¯ of a reflecting surface. To determine θ¯, the polarizer and analyzer angles are modulated at different frequencies. The difference frequency appears in a component of the detector output, and the amplitude of this component is directly proportional to cosδ. Consequently, θ¯ is located by searching for a null in this component. Modulation is achieved by mechanically oscillating the polarizing elements. A simple alignment procedure is entirely adequate in making the effect of alignment errors negligible with respect to the sensitivity of the instrument (which is better than 10 sec of arc for θ¯). The method for observing ψ¯ involves the measuring of the polarizer and analyzer rotations required to maintain the transmitted irradiance at a constant value. This eliminates the need for linearity in the photodetector. The value of tan ψ¯ is accurate to 1 part in 1000. No corrections are necessary for source and detector polarization. Deliberately large polarizer and analyzer misaligmnents of 0.02 rad have no significant effect on the accuracy of the determination of tanψ. Although operation has been confined to visible wavelengths, the techniques should be capable of operating over a wider range of wavelengths.

© 1968 Optical Society of America

Full Article  |  PDF Article
More Like This
Theory of New Reflectometer Techniques

W. Swindell
Appl. Opt. 7(5) 943-949 (1968)

High-precision reflectometer for submillimeter wavelengths

A. J. Gatesman, R. H. Giles, and J. Waldman
J. Opt. Soc. Am. B 12(2) 212-219 (1995)

A Normal Incidence Scanning Reflectometer of High Precision

Ulrich Gerhardt and Gary W. Rubloff
Appl. Opt. 8(2) 305-308 (1969)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved