FIBER-OPTIC LIGHT-PIPE WITH INCREASED STEADFASTNESS TO DIFFUSION OF MOLECULES FROM THE ENVIRONMENT Russian patent published in 2008 - IPC G02B6/02 

FIELD: the invention refers to the technology of creation of fiber-optic light-pipes.

SUBSTANCE: it may be used in the fields where conditions of the work demand protection of the light-pipe from diffusion of admixtures from without. Longitudinal cavities are created in a glass shell and these cavities are filled with gas not influencing on optical losses in the light-pipe. In quality of gas helium or heavy hydrogen is used. The diffusion of gas from the cavities of the light-pipe from without prevents diffusion of hydrogen from the environment inside the light-pipe to its light leading core of the light-pipe not to hinder propagation of light along the core. The core of the light-pipe may be single-mode or multi-mode, out of plain quartz glass or out of quartz glass alloyed with oxides of germanium, phosphorous, aluminum, boron. The cavities may be filled with gas not only from the end-face of the light-pipe but also from the outside through unsealed cavities in a definite place of the light-pipe.

EFFECT: possibility to work in atmosphere containing hydrogen at increased temperatures without additional optical losses connected with hydrogen.

10 cl, 5 dwg