FIELD: fibre-optic technology.
SUBSTANCE: device for inputting incoherent radiation into a light guide includes an elliptical mirror installed sequentially on one optical axis and optically connected, in the rear focus of which there is a source of incoherent optical radiation, and in the front focus a glass plate with a significant dependence of the refractive index on temperature is installed close to each other to ensure self-focusing of the light beam. A diverging lens, a collecting lens, a light filter, and a diaphragm are introduced into it, and the diverging lens is installed in the front focus of the elliptical mirror so that the radiation from the source of incoherent optical radiation, concentrated by the elliptical mirror and the diverging lens, comes out of it in the form of a quasi-parallel beam. Behind the diverging lens there is a collecting lens, and the light filter and diaphragm are located sequentially one after another between the diverging and collecting lenses, at the focus of which are a glass plate, a gradient rod lens and a light guide, also located closely behind each other. Moreover, the diaphragm has a maximum transmission in the centre and smoothly drops to zero towards the edges.
EFFECT: increase in the efficiency of radiation input into the optical fibre from an incoherent source with a given spectral region.
1 cl, 1 dwg
