Optical fiber laser frequency doubling device

Abstract

The invention discloses a fiber laser frequency doubling device, which includes a fiber collimator that collimates the fundamental frequency light output from the fiber into parallel light output, and a polarization beam splitter that separates the fundamental frequency light with randomly distributed polarization states into two beams in the propagation direction. Two beams of linearly polarized light with 90 degrees and the polarization directions are perpendicular to each other. The linearly polarized light is deflected in the direction of propagation by the mirror. The two beams of linearly polarized light are doubled by the frequency doubling crystal to obtain the frequency doubled laser output. The polarization beam combiner The two frequency-doubled laser beams are superimposed and coupled into the core output of the fiber through the fiber collimator. The invention uses a polarization beam splitter to split the polarization-independent fundamental frequency light and doubles the frequency respectively, thereby effectively improving the frequency doubling efficiency of the fiber laser; a fiber collimator is used to shape the beams of the fundamental frequency light and the frequency doubled light to realize frequency doubling The optical fiber output of the laser can be used as an independent fiber laser frequency doubling device, which has the advantages of high frequency doubling efficiency, good stability and easy operation.

Description

technical field [0001] The application belongs to the field of laser technology, in particular, it relates to a fiber laser frequency doubling device. Background technique [0002] Due to its small size, high electro-optical conversion efficiency, and good beam quality, fiber lasers have developed rapidly in the field of industrial laser applications. Currently, there are three types of continuous or pulsed fiber lasers with laser wavelength output of 1064nm, 1550nm, and 2000nm that are widely used. However, in laser applications, different application materials have different absorption characteristics for laser wavelengths, and the output wavelength of fiber lasers limits its further application. In order to expand the output wavelength range of fiber lasers, nonlinear frequency-doubling crystals are often used to perform second harmonic action on the fundamental frequency light output by fiber lasers to achieve low-wavelength frequency-doubling laser output. [0003] T...

AI Technical Summary

Problems solved by technology

The patent "A Green Fiber Laser (Publication No. CN201110302554.3)" adopts the method of frequency doubling outside the cavity, and uses a lens group to focus the fundamental frequency light output by the fiber laser onto the Brewster plate, and the Brewster plate transmits The light is frequency-multiplied twice to achieve green light output. This system has the problem of low frequency-doubling efficiency, and it is difficult to generate high-power frequency-doubling light output.

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