Title :
Resolution improvement in refracted near-field index measurement by a lens-shaped liquid cell
Author_Institution :
Universitÿt Kaiserslautern, Lehrstuhl fÿr Theoretische Elektrotechnik, Kaiserslautern, West Germany
Abstract :
The resolution of the refracted near-field measurement method for optical-fibre refractive-index profiles has been improved by a factor of about three by simply using a lens-shaped liquid cell and an oil immersion objective. The resulting optimum resolution is below 0.2 ¿m and at 0.633 ¿m wavelength with polarisation normal to the refractive index gradient.
Keywords :
lenses; optical fibres; refractive index measurement; lens-shaped liquid cell; oil immersion objective; optical-fibre refractive-index profiles; refracted near-field index measurement; refractive index gradient;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19830396
