Deep blue light random fiber laser based on femtosecond active phase shift fiber grating

Abstract

The invention relates to a deep blue light random fiber laser based on a femtosecond active phase shift fiber grating, and relates to the technical field of laser. Comprising a 900nm random laser seed light source, a collimator, a first plano-convex lens, a frequency doubling crystal, a temperature control platform, a second plano-convex lens and a beam splitter prism, 900nm random laser enters the collimator; a light beam enters the frequency doubling crystal, the frequency doubling crystal efficiently absorbs 900nm wave band random laser through the CuFe2O4 metal nanoparticle film, and the output end face is plated with a 450nm anti-reflection film; the first plano-convex lens and the second plano-convex lens enable the optimal focusing waist spot of 900nm random laser to be at the central position of the frequency doubling crystal; 900 nm and 450 nm random laser is collimated through a second plano-convex lens, the 900 nm random laser is separated through a beam splitter prism, and 450 nm deep blue light random laser output is obtained. According to the invention, blue light random laser output with high stability, low phase noise and low coherence is obtained.

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