Nondestructive Refractive Index Characterization Of Optical Fibers Using A Phase Contrast Scanning Optical Microscope

1985 ◽  
Vol 24 (3) ◽  
Author(s):  
S. Ball
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Phase Contrast ◽  
Optical Microscope

Microscopical Characterization of Glass Fragments

1972 ◽  
Vol 55 (4) ◽  
pp. 834-839
Author(s):  
Walter C Mccrone
Keyword(s):  
Refractive Index ◽  
Phase Contrast ◽  
Optical Microscope ◽  
Variation Method ◽  
Interference Microscope ◽  
Temperature Method ◽  
Index Match

The methods described involve the double variation method of Emmons which uses the optical microscope and measures dispersion of refractive index. The refractive index of match of the glass and one of a known set of carefully standardized liquids is determined by: (1) measuring the temperature of index match of the glass-liquid combination to obtain the refractive index as a function of wavelengths; and (2) measuring the wavelength of index match of the glass-liquid combination to obtain the refractive index as a function of temperature. Method 1 utilizes a hot stage microscope and monochromator. Method 2 utilizes a hot stage microscope and dispersion staining objective. Modifications of method 1 utilize phase contrast, a Schlieren microscope, or an interference microscope to increase the sensitivity of index match.

scholarly journals Characterization of Chromatic Dispersion and Refractive Index of Polymer Optical Fibers

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 730 ◽  
Author(s):  
Igor Ayesta ◽  
Joseba Zubia ◽  
Jon Arrue ◽  
María Illarramendi ◽  
Mikel Azkune
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Chromatic Dispersion ◽  
Polymer Optical Fibers

TEM characterization of proton-exchanged LiNbO3 optical waveguides

1986 ◽  
Vol 44 ◽  
pp. 480-481
Author(s):  
W. E. Lee
Keyword(s):  
Refractive Index ◽  
Benzoic Acid ◽  
Optical Waveguides ◽  
Total Internal Reflection ◽  
Index Of Refraction ◽  
Optical Measurements ◽  
Lithium Ions ◽  
Wide Channel ◽  
Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

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