Encircling type high-density injection waveguide laser device and laser generating method

Abstract

The invention discloses an encircling type high-density injection waveguide laser device and a laser generating method. The encircling type high-density injection waveguide laser device comprises a metallic waveguide, a gain optical fiber, an LD pumping array and a cooling system. The gain optical fiber is a disc-shaped bare optical fiber and placed in the metallic waveguide, and the LD pumping array is located on the side face of the metallic waveguide. Pumping light is incident to the metallic waveguide and continuously reflected in the metallic waveguide and penetrates through the gain optical fiber. The high-power laser generating method is characterized in that an encircling type bare optical fiber disc is manufactured, the LD pumping array is arranged to form multiple paths of pumping light, the pumping light is injected from different side faces of the optical fiber disc and penetrates through the optical fiber, and therefore high-power lasers sufficient in transmission mileage are generated. Different from a common optical fiber laser device, the high-power LD pumping array can directly pump fiber cores of the gain optical fiber in a high-density mode from the periphery without a complex shaping, collimation and optical fiber coupling system. The lasers are guided out through the optical fiber and have high output power of kilowatts.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to a surround-type high-density injection waveguide laser. Background technique [0002] High-power fiber laser is a new type of solid-state laser with doped fiber as the laser medium. It skillfully integrates fiber technology and laser principle. Compared with traditional solid-state lasers, fiber lasers are smaller in size, 10 times lower in power consumption, excellent in beam quality, and long in service life. [0003] Regardless of whether it is domestic or foreign, most high-power fiber lasers currently use end-pumping methods, such as figure 1 As shown, it includes a D pump 101 at the end, a focusing lens group 102 behind the pump, a dichroic plate 103 on the optical path behind the lens group, and a double-clad fiber 104 behind the dichroic plate. The further improvement of the output power of the end-pumped fiber laser is mainly limited by the following two aspects: [0004] 1) Usi...

AI Technical Summary

Problems solved by technology

As far as the current situation is concerned, through theoretical calculation and verification of experimental data, the length of the gain fiber of an end-pumped fiber laser is generally more than ten meters, and will not exceed 20 meters. If the length of the gain fiber continues to increase, the output power will increase rapidly with the increase of the length. decrease, the heat generated will increase accordingly, so the length of the gain fiber is limited

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