FIBER INTRACAVITY-DOUBLED LASER (VARIANTS) Russian patent published in 2008 - IPC H01S3/10 

FIELD: physics.

SUBSTANCE: invention concerns laser technics, namely fiber lasers with frequency doubling in the visible spectrum band, and can be applied as emission source in such technological spheres as superdense optic memory (and recording), laser colour printing, laser color displays, biomedical diagnostics, analytical measurement, forensic medical examination etc. Fiber intracavity-doubling laser includes pump source, active optic fiber placed into colour-selective mirror resonator, where the first mirror omits pump emission and reflects basic generated emission. The second colour-sensitive mirror is outriggered out of the optic fiber and reflects both basic emission and the quadratic component. The third colour-sensitive mirror reflects basic emission and omits the quadratic component. Non-linear crystal with second-type synchronism placed between the optic fiber and the second mirror is directed so as to minimise angle of drift for the generated wavelength, and focusing elements. Spectrum selector is fitted between the fiber and the crystal for spectrum reduction and output power stabilisation. The selector comprises Bragg grating directly at the fiber end (of filter or interferometer). The second colour-selective mirror with additional focusing element comprises telescopic reflector sustaining optimal focusing and drift compensation of the crystal.

EFFECT: obtaining of fiber intracavity-doubled laser in the basis of a simple non-polarised scheme with high doubling efficiency.

27 cl, 2 dwg