SINGLE-FIBER NARROW-BAND LASER Russian patent published in 2021 - IPC H01S3/67 

FIELD: laser systems.

SUBSTANCE: invention relates to devices for generating coherent electromagnetic waves using stimulated radiation and can be used in quantum devices for generating, stabilizing, modulating, demodulating or converting frequency using stimulated radiation in the infrared region of the spectrum, namely, single-fiber frequency-tunable narrow-band lasers with an adjustable spectral line width designed for generating, amplifying, modulating, demodulating or converting the frequency of fiber lasers. The optical scheme of a single-fiber narrow-band laser consists of a housing containing three thermally stabilized blocks, each made in the form of heat-conducting substrates 1 with fiber Bragg gratings 2 and 3 fixed on them and an active fiber 4 laid in a ring-like manner without overlapping on a heat-conducting substrate 1, as well as an optical insulator 7, a laser radiation input element in the form of a coupler 5, a thermally stabilized pump module 6, from the side of the optical insulator 7, from which the generated laser radiation starts, the end of the output light guide 8 is located, and the end of the output light guide 9, located on the side of the “blind” fiber Bragg grating 2, from which the width of the spectral line of laser radiation, the state of polarization is controlled.

EFFECT: possibility of detecting and controlling the coherence length of the laser radiation of a multi-channel laser system in the operating mode and reducing the cases of failure of the entire system as a whole.

1 cl, 2 dwg