Device used for increasing stimulated Brillouin scattering threshold of single frequency high-power fiber amplifier

Abstract

The invention relates to a device used for increasing the stimulated Brillouin scattering threshold of a single frequency high-power fiber amplifier, belonging to the coherently combining field of the high-power broadband fiber amplifier and the fiber laser. In the device, heat fins (5) are unevenly distributed on the inside of a inner ring disk (1), a spiral groove is carved on the outside surface of the inner ring disk, an optical fiber enters the spiral groove from a short shaft arranged on the outside surface of the inner ring disk, rounds along the spiral groove, and extends form the short shaft arranged on the outside surface of the inner ring disk; inside surfaces of a left outer ring disk (2) and a right outer ring disk (3) are separately bound with the outer surface of the inner ring disk, two ends of the optical fiber enter or exit from a concave groove (61) in the left outer ring disk or a concave groove (62) in the right outer ring disk; one end of the left outer ring diskis connected and fixed with one end of the right outer ring disk though a bolt (9) and a nut (10), and the other end of the left outer ring disk is connected and fixed with the other end of the rightouter ring disk though a bolt (7) and a nut (8). The device of the invention can cleverly adapt to optical fiber with different lengths, is easy to install and dismantle, and can realize changes of the temperature and pressure of the optical fiber.

Description

technical field [0001] The invention relates to a device for increasing the stimulated Brillouin scattering threshold of a single-frequency high-power optical fiber amplifier, and belongs to the field of coherent synthesis of high-power broadband optical fiber amplifiers and optical fiber lasers. Background technique [0002] Fiber amplifiers are divided into rare earth doped fiber amplifiers and nonlinear fiber amplifiers. Rare-earth-doped fiber amplifiers use rare-earth elements (Nd, Sm, Ho, Er, Pr, Tm, Yb, etc.) to achieve direct amplification of light by using the stimulated emission mechanism. [0003] Although IPG has launched a 3 kW broadband near-diffraction-limited commercial single-mode fiber laser, in order to obtain MW-level lasers with good quality, coherent combination of narrow-band single-frequency fiber lasers is required. Therefore, increasing the output power of a single single-frequency fiber laser is the key to realizing coherent combination of narrow-b...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing device that the optical fiber cannot be reused and the temperature and pressure of the optical fiber cannot be changed at the same time, the present invention provides a device that can realize the temperature and pressure change of the optical fiber at the same time, the optical fiber can be reused, and the length of the optical fiber can be adjusted

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