Showing papers on "Step-index profile published in 1970"
TL;DR: No one refractive index distribution can be "ideal" for both meridional and skew rays, and the optimal index distribution varies with the ratio of rod length to radius and the relative aperture and is intermediate between the helically ideal and the meridionally ideal distributions.
Abstract: Cylindrical transparent media whose refractive index decreases with increasing cylinder radius have been investigated in connection with coherent light propagation in gas waveguides. Recently, graded index glass rods (trade named SELFOC rods) have been used as imaging devices. We report here on a geometrical optical study of graded index systems used for relaying images at unit magnification. We have found that two index distributions previously studied result in large image aberrations when the presence of skew rays is taken into account. We have derived an index distribution which is “ideal” for helical skew rays. Using ray tracing methods we have examined image aberrations for various index distributions and for various rod geometries. We find that (1) no one refractive index distribution can be “ideal” for both meridional and skew rays, (2) image resolution is generally low, reaching about 1000 spots per field, and (3) the optimal index distribution varies with the ratio of rod length to radius and the relative aperture and is intermediate between the helically ideal and the meridionally ideal distributions.
105 citations
10 citations
TL;DR: In this article, the pressure coefficient of the refractive index of germanium was measured based on the interference spectrum and the region covered extends from 4250 to 6250 cm-1 (0.5 − 0.8 eV).
7 citations
TL;DR: In this paper, a comparison between lens-like guides with parabolic index profiles and clad fibers is made, from several points of view: delay distortion, beam capacity per unit cross section, ability to negotiate bends, and deterioration of transmission due to imperfections.
Abstract: A comparison is made between clad fibers and lens-like guides with parabolic index profiles, from several points of view: delay distortion, beam capacity per unit cross section, ability to negotiate bends, and deterioration of transmission due to imperfections. Theoretical and experimental quantitative comparisons are also presented.
3 citations
TL;DR: In this article, an error function is defined to estimate the discrepancy between the expected electric-field radial derivative at the core-cladding interface and that obtained by numerically integrating the wave equation through the use of Runge-Kutta method.
Abstract: Near field distribution, propagation constant and dispersion characteristics of nonlinear single-mode optical fibers have been investigated. Shooting-method technique is used and implemented into a computer code for both profiles of step-index and graded-index fibers. An error function is defined to estimate the discrepancy between the expected electric-field radial derivative at the core-cladding interface and that obtained by numerically integrating the wave equation through the use of Runge-Kutta method. All of the above calculations done under the ocean depth in which the depth will affect the refractive index that have a direct effect on all the optical fiber parameters. KeyWords: Nonlinear refractive index, Normalized propagation constant, Mode delay factor, Material dispersion, Waveguide dispersion.
2 citations
Patent•
26 May 1970
TL;DR: In this paper, an OPTICAL GLASS HAVING a high reactive index, a low dispersion and a high stability during meling can be constructed by adding 5-10 weight percent of the GO to a comparison of B2LA2O8THO2 and TA2O5 systems.
Abstract: AN OPTICAL GLASS HAVING A HIGH REFRACTIVE INDEX, A LOW DISPERSION AND A HIGH STABILITY DURING MELTING CAN BE PRODUCED BY ADDING 5-10 WEIGHT PERCENT OF MGO TO A COMPOSITION OF THE B2LA2O8THO2 SYSTEMS OPTIONALLY CONTAINING SIO2, ZRO2 AND/OR TA2O5.
1 citations
1 citations