Method for reducing nonlinear effect in optical fiber amplifier and realizing environmental stabilization

Abstract

The invention provides a method for reducing nonlinear effect in an optical fiber amplifier and realizing environmental stabilization. In the method provided by the invention, the pulse amplification based on circularly polarized light is realized and the nonlinear effect in the amplifier is effectively reduced through a simple device (namely a 1 / 4 wave plate); an amplification technique can be combined with an existing pulse amplification technique (such as a chirp pulse amplification technique, a separated pulse amplification technique and the like) to further reduce the nonlinear effect inthe amplifier, and the method is easy to realize; and because a scheme that a two-way structure is combined with a Faraday rotation mirror is adopted, the technique has robustness on environmental disturbance and the operation is stable.

Description

Technical field [0001] The invention relates to the technical field of nonlinear microscopy imaging, in particular to a method for reducing the nonlinear effect in a fiber amplifier and achieving environmental stability. Background technique [0002] Laser processing, nonlinear microscopy imaging and other fields require high-energy light pulses. For this reason, it is necessary to amplify the low-energy pulses directly output by the laser. However, in fiber amplifiers, nonlinear effects make the spectrum broaden and distort, and affect the quality of the output pulse. Therefore, measures need to be taken to reduce the nonlinear effects in the amplifier. [0003] At present, most of the widely used optical pulse amplification technologies are based on linearly polarized light, that is, the polarization state of the light in the gain fiber is linearly polarized, and its corresponding nonlinear refractive index is relatively high (1.5 times that of circularly polarized light). The l...

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Problems solved by technology

But this method needs to use non-polarization maintaining fiber

Because the optical fiber is affected by environmental disturbances, the polarization state of the output light of the gain fiber changes randomly, and complex electronic equipment needs to be used to adjust the angle of the subsequent 1 / 4 wave plate in real time to restore the original linear polarization, which makes the system structure complex and costly.

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