Automatic coupling device from optical fiber laser device to single mode optical fiber

Abstract

The invention discloses an automatic coupling device from an optical fiber laser device to a single mode optical fiber. An input end of a first optical fiber collimator is connected with an output end of the optical fiber laser device; a collimating laser beam is output to a telescope system composed of a first convex lens and a second convex lens fixed to a one-dimensional piezoelectric ceramic translation table, and the collimating laser beam is coupled to the single mode optical fiber through a second optical fiber collimator arranged on a two-dimensional piezoelectric ceramic translation table; the collimating laser beam is divided into two paths through a single mode optical fiber coupler, wherein one path is converted into an electric signal through a photoelectric detector, the electric signal enters into a controller, the controller sends a control signal according to a value of the photoelectric signal to control a driver to drive a one-dimensional piezoelectric ceramic and a two-dimensional piezoelectric ceramic so as to form a closed-loop control system, and the other path is output for use. The automatic coupling device has the advantages of high structural coupling efficiency, self-adaptive temperature, external-environment-change such as vibration and the like resistance, reliable running, low fault rate and the like. The automatic coupling device is widely applied to the fields of precise light spectrum, quantum optics and others using the optical fiber laser device.

Description

technical field [0001] The present invention relates to a coupling device from a fiber laser to a single-mode fiber, further comprising a fiber collimator to roughly adjust the laser mode output by the fiber laser, a telescope system to fine-tune the laser mode, and a piezoelectric ceramic The resulting micro-displacement makes the coupling lens and coupling spot move within the micron level, so that the laser mode can meet the transmission mode of the single-mode fiber to the greatest extent, so as to realize the coupling of the fiber laser to the single-mode fiber, and use real-time feedback to adjust the coupling efficiency. The automatic coupling system is widely used in fields such as spectroscopy, quantum optics, and optical communication that use fiber lasers. Background technique [0002] Fiber lasers have the advantages of stable performance, high output power, good spectral characteristics, and portability, and are currently one of the most promising lasers. With ...

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Problems solved by technology

However, the core diameter of the single-mode optical fiber is small, about 8-10m, and there is only one transmission mode, and the mechanical device used in the above-mentioned prior art is difficult to realize the movement with an accuracy of up to the order of microns, resulting in that the coupling efficiency cannot be further improved , the adjustment process is complex and has high requirements for the user, and the coupling element cannot be adjusted in real time according to changes in external conditions to maintain high coupling efficiency and is easily affected by the external environment

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