Abstract

A new technique for measuring reflectivity differences between two samples is reported. An electrically driven tuning fork is used to place the two samples alternately in the beam of a reflectometer, and a lock-in amplifier is used for detection of the difference signal. Advantages of this system include short deadtime, vacuum operation, and extremely high Q. The sensitivity is such that changes in reflectivity of the order of 0.001% can be observed.

© 1974 Optical Society of America

Loss Measurements in Optical Fibers. 1: Sensitivity Limit of Bolometric Techniques

R. L. Cohen
Appl. Opt. 13(11) 2518-2521 (1974)

Kramers-Kronig Analysis of Ratio Reflectance Spectra Measured at an Oblique Angle

Marvin R. Querry and Wayne E. Holland
Appl. Opt. 13(3) 595-598 (1974)

Apparatus for the Measurement of Optical Absorptivity in Laser Mirrors

R. A. Hoffman
Appl. Opt. 13(6) 1405-1411 (1974)

Double-Beam Two-Channel Wavelength-Modulated Reflectometer

W. Kardux and H. J. Krusemeyer
Appl. Opt. 13(11) 2704-2711 (1974)

A Sensitive Spectrophotometer for Optical Reflectance and Transmittance Measurements

D. D. Sell
Appl. Opt. 9(8) 1926-1930 (1970)