Planar optical waveguide chip and waveguide type single-mode fiber laser

Abstract

The invention belongs to the technical field of laser, in particular to a planar optical waveguide chip and a waveguide type single-mode fiber laser. The planar optical waveguide chip comprises a planar optical waveguide chip main body, wherein the planar optical waveguide chip main body is used for butting and coupling laser emitted by a semiconductor laser. The planar optical waveguide chip mainbody comprises a light inlet end and a light outlet end. Waveguide width is in gradient reduction from the light inlet end to the light outlet end. The waveguide thickness is unchanged from the lightinlet end to the light outlet end. The waveguide thickness and waveguide width of the light outlet end are equal. The planar optical waveguide chip is different from a complex optical component of atraditional optical fiber laser. According to the single-mode fiber laser, multimode laser emitted by the high-power semiconductor laser can be coupled into the single-mode fiber with a small fiber core diameter in a lossless manner through the planar optical waveguide chip which is a simple optical device, so that the high-power laser can be directly output through the single-mode fiber.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a planar optical waveguide chip and a waveguide type single-mode fiber laser. Background technique [0002] In recent years, fiber laser technology has developed rapidly. Due to the use of optical fibers for laser output, fiber lasers have many convenient properties. However, other companies and research units in the industry mostly focus on improving the absolute power of fiber lasers: most of them use multimode fibers (such as figure 1 ) as optical fiber, and few manufacturers do pure single-mode fiber (such as figure 2 ) high power (>1W) laser output. [0003] The reason is that traditional fiber lasers (such as image 3 ), the multimode laser output fiber has a larger core diameter, which satisfies the formula d>2.405*l / (p*NA), where d is the fiber core diameter, l is the fiber transmission wavelength, and NA is the fiber numerical aperture. Due to the large c...

AI Technical Summary

Problems solved by technology

The output beam of the multimode fiber laser is multimode light, which is a mixed mode laser with a large M^2 factor. The beam after outputting the fiber has irregular spatial evolution, which is not easy to integrate and expand, and cannot be used for precise laser processing.

In addition, due to the good quality of the single-mode laser beam and the small optical parameter product, precise positioning can be achieved and used in the field of fine laser processing; due to the poor quality of the beam, multi-mode optical fibers cannot be used in the field of fine laser processing

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