säteilynjohde

Säteilynjohde, also known as a dielectric waveguide or optical fiber, is a structure that guides electromagnetic waves, typically light, by total internal reflection. It is made of a transparent dielectric material, such as glass or plastic, and consists of a core, which has a higher refractive index, surrounded by a cladding, which has a lower refractive index. When light enters the core at an appropriate angle, it undergoes repeated total internal reflections at the core-cladding boundary, causing it to propagate along the length of the waveguide.

The principle of total internal reflection is crucial for the operation of a säteilynjohde. This phenomenon occurs when light travels from a medium with a higher refractive index to a medium with a lower refractive index, and the angle of incidence at the boundary exceeds the critical angle. In a säteilynjohde, the core acts as the higher refractive index medium and the cladding as the lower refractive index medium.

Säteilynjohde are widely used in telecommunications for transmitting data over long distances due to their low signal loss and high bandwidth. They are also employed in various other applications, including medical imaging, industrial inspection, and sensing. The design and properties of a säteilynjohde can be tailored to specific applications by controlling the core diameter, refractive index profile, and material composition.