China
Africa
Explore chapters and articles related to this topic
Optical Fibers
Published in Johan Meyer, Justice Sompo, Suné von Solms, Fiber Lasers, 2022
Johan Meyer, Justice Sompo, Sune von Solms
The guidance of a light beam in the optical fiber takes place because of the phenomenon of total internal reflection. Total internal reflection occurs when light passes from a higher refractive index material to a lower refractive index material. However, for total internal reflection to take place, specific conditions must be met. Let us consider Figure 2.1 where a ray of light is incident at the interface of two media of different refractive indices (i.e. air and glass), experiment shows that the ray will undergo partial reflection and partial refraction.
Optical Properties of Solids
Published in Elaine A. Moore, Lesley E. Smart, Solid State Chemistry, 2020
Elaine A. Moore, Lesley E. Smart
The refractive index of materials is very important for applications such as lenses and optical fibres. The refractive index depends on the polarizability of the atoms/ions in the solid. Highly polarizable ions such as Pb2+ lead to an increase in refractive index.
Introductory Concept
Published in Partha Pratim Sahu, Fundamentals of Optical Networks and Components, 2020
Consider a step-index fiber which has a core refractive index of 1.495. What is the maximum refractive index of the cladding in order for light entering the fiber at an angle of 60° to propagate through the fiber? Air has a refractive index of 1.0.
Investigation of surface adsorption and thermodynamic properties of 1-tetradecyl-3-methylimidazolium bromide in the absence and presence of tetrabutylammonium bromide in aqueous medium
Published in Journal of Dispersion Science and Technology, 2022
Harsh Kumar, Gagandeep Kaur, Shweta Sharma
The refractive index is actually the measure of the bending of a ray of light when it passes from one medium into another. This important property can also be utilized for the determination of CMC. This is due to the fact that the monomers of surfactants have a lower value of the refractive index as compared to formed micelle. From the graph of refractive index versus concentration of [C14mim][Br] represented in Figure 4, it can be observed that below CMC, the values of refractive index increases rapidly with the addition of [C14mim][Br], but as the [C14mim][Br] concentration approaches the point of CMC, the rate of increase of refractive index with the concentration of [C14mim][Br] decreases. Thus, a breakpoint is obtained in the graph and the concentration of [C14mim][Br] corresponding to this breakpoint gives the value of CMC of [C14mim][Br].[51] The obtained values of the refractive index for all the studied systems are reported in Table 5. The value of CMC of [C14mim][Br] obtained by utilizing refractive index measurements is reported in Table 6.
A study on optical and thermal properties of natural polymer-based hemicellulose compounds
Published in Journal of Biomaterials Science, Polymer Edition, 2021
Hina Abid, Shahzad Maqsood Khan, Saeed Iqbal
In general, the behavior of refractive index (n) and extinction coefficient (K) follow the same pattern, the extinction coefficient (K) decreased with an increase in the wavelength except for Mimosa pudica (sample 3) which is also depicted through absorption spectrum, this variation is due to presence of slight shade and bit more thickness of the film in comparison to rest of the films while refractive index (n) decreases with the increase in wavelength for all the samples. The refractive index at 600 nm wavelength for Plantango ovate is 2.5, Cydonia oblonga is 3, Mimosa pudica is 5.2 and Cochlospermum religiosum possesses 3.75. The higher the value of the Refractive index, greater the time required to travel through that material. The variation of the refractive index is a property of dispersion that directly affects the functional properties of optical materials.
Interrogation system of signals from rotation sensors using tilted fiber Bragg gratings
Published in Cogent Engineering, 2020
Kozbakova Ainur, Piotr Kisała, Wójcik Waldemar, Kalizhanova Aliya, Mamyrbayev Orken, Akhmetzhanov Maksat
Temperature significantly affects the characteristics of optical structures showing periodicity along the optical fiber, on which they are produced. A change in temperature causes changes in the refractive index and also affects the size of the structure due to thermal expansion. The latter effect is dominant in the case of periodic structures, also TFBG. Measurements of many physical quantities require compensation or at least control of temperature changes. There are solutions, in which the authors claim, that TFBG sensitivity to temperature, approximately equals to FBG sensitivity and amounting to about 10 pm/°C is negligible, e.g., when measuring tilt angle, but in most applications such a change in length wave causes serious difficulties in the detection of other quantities, measured with such a sensor.