Step-index profile

About: Step-index profile is a research topic. Over the lifetime, 3104 publications have been published within this topic receiving 53199 citations.

Optical fiber having enhanced bend resistance

Abstract: An optical fiber (22) of this invention is suitable for use in tethered vehicle. The optical fiber has a W-shaped refractive index configuration and is characterized by a Δ of at least 0.9% and a cutoff wavelength of less than 1500 nm. Further, the refractive index configuration is such that a core (30) is characterized by a relatively high value of Δ + . The value of Δ + is at least 0.6% for a single window of operation, whereas for a dual window it is 0.9%. Also, the refractive index configuration of the optical fiber is characterized by a depressed inner cladding portion (32) which has a Δ - of 0.3% and an outer radius about equal to the product of 2.5 and the radius of the core.

Anti-reflection film and process for preparation thereof

Abstract: This invention provides an anti-reflection film for use in various displays which prevents the reflection of light on the surface and enables necessary visual information to be clearly discerned. The anti-reflection film has a hard coat layer 4 , an intermediate refractive index layer 3 , a high refractive index layer 2 and a low refractive index layer 1 formed in this sequence on a transparent base film 5 , such that the refractive indices of the adjacent layers satisfy the relationship 2.20>refractive index of the high refractive index layer>refractive index of the intermediate refractive index layer>refractive index of the low refractive index layer >1.40.

Refractive Index and Diameter Determinations of Step Index Optical Fibers and Preforms

Abstract: A new method to determine the index of refraction in combination with the diameter of the cores of step-index optical fibers and preforms is presented. The technique is based on an analysis of the backscattered light when a beam from a cw laser impinges transversely upon the fiber or preform. A geometrical-optics analysis shows that, under appropriate assumptions, a combination of the refractive indexes and the radii of the core and cladding can be determined from unique characteristics of the backscattered radiation pattern. The theory is compared to experimental observations with excellent agreement.

Refractive index sensor with a guided-mode resonant grating filter

Abstract: This paper describes a novel refractive index sensor with a guided-mode resonant grating (GMRG) filter. The GMRG filter is a narrowband wavelength reflection filter. The incident light is reflected at a resonance condition of incident angle and wavelength. When the grating filter is covered by a liquid to be tested, the resonant condition depends upon its refractive index. The refractive index of the liquid can be determined from the resonance angle for a known wavelength. Since a full-half width of incident angle for the resonance is very narrow (less than 0.1 degree(s)), a high resolution is expected. We designed the GMRG filters for the refractive index sensor. And the resonance angle of incidence was investigated experimentally for the mixture of water and ethyl alcohol.

High refractive index and other optical properties of heterogeneous media

Abstract: Anomalously high values of the resonant refractive index, Rayleigh scattering extinction coefficient, and absorption or amplification are predicted for a heterogeneous medium composed of metallic nanoballs suspended in a transparent matrix. Optical characteristics of original materials do not posses resonant features.