Out-of-focus compensated high-power narrow linewidth and linear polarization optical fiber laser generating system

Abstract

The invention discloses an out-of-focus compensated high-power narrow linewidth and linear polarization optical fiber laser generating system. The out-of-focus compensated high-power narrow linewidthand linear polarization optical fiber laser generating system comprises a narrow linewidth and linear polarization optical fiber seed source, a polarization control module, a non-polarization-maintaining cascading optical fiber amplifier, an out-of-focus compensated beam-expanding collimating system, an integrated polarization and optical signal extracting module and an active polarization controlsystem. Laser output from the narrow linewidth and linear polarization optical fiber seed source is injected to the non-polarization-maintaining cascading optical fiber amplifier through the polarization control module, and the amplified laser is injected to the integrated polarization and optical signal extracting module through the out-of-focus compensated beam-expanding collimating system. Anextracted optical signal is converted to an electrical signal by the integrated polarization and optical signal extracting module, and the electrical signal is injected to the active polarization control system. The electrical signal is processed by the active polarization control system, and a control signal is applied to the polarization control module, so the closed-loop control of the whole system is realized. The system is capable of simultaneously realizing the high-power narrow linewidth, linear polarization, and low-aberration optical fiber laser output.

Description

technical field [0001] The invention belongs to the technical field of strong lasers, in particular to a defocus compensation type high-power narrow-line width and linearly polarized optical fiber laser generating system. Background technique [0002] High-power narrow-linewidth, linearly polarized fiber laser has a wide range of application requirements in many application fields such as coherent synthesis, spectral synthesis, nonlinear frequency conversion, earth science, atomic and molecular physics, etc. [0003] Usually, high-power narrow-linewidth, linearly polarized fiber lasers are directly implemented by seed servo fully polarization-maintaining cascaded amplifiers. In the full polarization-maintaining cascaded amplification link, since the gain of stimulated Brillouin scattering in polarization-maintaining fiber is higher than that of non-polarization-maintaining fiber, the effect of stimulated Brillouin scattering becomes the main limitation that limits its develo...

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Problems solved by technology

Defocus aberration will reduce the synthesis efficiency of the synth

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