High-power narrow-linewidth optical fiber laser polarization control system and method

Abstract

The invention provides a high-power narrow-linewidth optical fiber laser polarization control system and method. In the high-power narrow-linewidth optical fiber laser polarization control system, thepolarization state of output laser is regulated and controlled by controlling a polarization control voltage applied to a polarization controller; and the high-power narrow-linewidth optical fiber laser polarization control system comprises a high-power narrow-linewidth linear polarization optical fiber laser device and a polarization voltage control system, the polarization voltage control system collects an optical signal of a p polarized light beam in an output light beam of the high-power narrow-linewidth linear polarization optical fiber laser device, the optical signal is converted intoan electric signal, the electric signal is processed to generate a polarization control voltage, and the polarization control voltage is applied to the polarization controller so as to regulate and control the polarization state of the output laser and realize closed-loop control of the whole system. According to the invention, a polarization control effect with low residual error and high precision can be realized, and a technical support is provided for the development of a high-power, high-extinction-ratio and narrow-linewidth optical fiber laser system based on active polarization control.

Description

technical field [0001] The invention belongs to the field of fiber laser technology, and in particular relates to a high-power narrow-linewidth fiber laser polarization control system and method. Background technique [0002] High-power narrow-linewidth linearly polarized fiber lasers have strong application requirements in the fields of laser communication, coherent combining, and nonlinear frequency conversion. At present, the power amplification structure based on the main oscillation is the mainstream way to generate this type of fiber laser output. In this scheme, a low-power narrow-linewidth linearly polarized laser is generally used as the main oscillation source, and a cascaded polarization-maintaining amplifier is used as a power amplification module to finally achieve high-power, high-extinction ratio narrow-linewidth linearly polarized fiber laser output. However, limited by the thermal effect of the polarization maintaining gain fiber itself, thermally induced b...

AI Technical Summary

Problems solved by technology

However, limited by the thermal effect of the polarization maintaining gain fiber itself, thermally induced birefringence effect, nonlinear effect, mode instability, fiber end face damage, complex cutting and welding process and other factors, the narrow linewidth linearly polarized fiber laser can be further improved based on the above scheme. The output power is facing severe challenges

In addition, the current results show that the nonlinear effects and mode instability thresholds in narrow-linewidth linearly polarized fiber lasers are significantly lower than those in non-PM fiber amplifiers of the same type

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