Green light output optical fiber laser

Abstract

The invention discloses a green light output fiber laser, which comprises a fundamental frequency laser system and a frequency doubling system. The frequency doubling system uses a collimating and focusing lens group to collimate and focus the laser output from the The laser is separated into two beams of linearly polarized light whose propagation direction is 90 degrees and the polarization directions are perpendicular to each other. The linearly polarized light is deflected in the direction of propagation by a mirror, and the two beams of polarized light are doubled by a frequency doubling crystal to obtain a green laser output. , the polarization beam combiner superimposes two green laser beams, and realizes high-power green light output through the output mirror. The invention can realize the secondary frequency doubling of the traditional polarized fiber laser, effectively improve the frequency doubling efficiency of the fiber laser, and realize high-power green laser output. It has the advantages of high frequency doubling efficiency and good stability, and is suitable for applications in the fields of laser projection, underwater imaging, and glass and other non-metallic material processing.

Description

technical field [0001] The application belongs to the field of laser technology, in particular, it relates to a green light output fiber laser. 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. Due to the effect of different materials on the wavelength, green lasers become ideal laser light sources in the application of non-metallic materials such as laser projection, underwater imaging, and glass. At present, the scheme of 532nm laser output often uses a nonlinear frequency doubling crystal to double the frequency of the fundamental frequency light output at 1064nm to achieve green light output. [0003] The application of non-linear frequency conversion technology in all-...

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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