FIELD: physics.
SUBSTANCE: fibre laser with nonlinear radiation frequency conversion comprises a pumping source, a fibre linear resonator, a module for guiding pumping radiation into amplification fibre, a spectrally selective reflecting element on one side of the linear resonator and having a nonlinear optical crystal of a high-Q resonator on the other side, as well as a focusing element located between the end of the fibre and the high-Q resonator. One of the two flat working surfaces of the nonlinear crystal, or the optical element located in the high-Q resonator, is perpendicular to the incident radiation and serves as exit mirror of the linear resonator. Between the fibre and the focusing element there is a collimating optical element, between which there is a polariser, the surfaces of which are inclined towards the axis of the resonator by an angle of not less than one degree.
EFFECT: efficient generation of nonlinearly converted radiation with improved temporal stability of radiation power.
24 cl, 11 dwg
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