METHOD OF MAKING FIBRE BRAGG GRATINGS IN NON-PHOTOSENSITIVE FIBRE-OPTIC GUIDES Russian patent published in 2017 - IPC G02B6/28 

FIELD: physics, instrument-making.

SUBSTANCE: invention relates to optical instrument-making and can be used in making fibre Bragg gratings of a refraction index. The method comprises using pulsed radiation of a femtosecond laser, which is focused by a microlens through the polished lateral face of a transparent ferrule into the core of a non-photosensitive fibre-optic guide with a protective coating. The non-photosensitive fibre-optic guide is moved by a high-precision linear positioner with constant velocity V. The space between the non-photosensitive fibre-optic guide and the inner walls o the ferrule is filled with an immersion liquid for compensating for curvature of the lateral surface of the non-photosensitive fibre-optic guide. The refraction index of the immersion liquid is selected equal to the refraction index of the ferrule. The focal position is adjusted before manufacture using a piezoceramic positioner on which the ferrule is mounted. The piezoceramic positioner is also used to adjust the position of the focusing point inside the core of the non-photosensitive fibre-optic guide during manufacture.

EFFECT: invention increases accuracy of making fibre Bragg gratings, improves strength characteristics and increases the rate of manufacture of fibre Bragg gratings.

6 cl, 4 dwg