Device for generating Q-modulated mode-locked noise square wave pulse

Abstract

The invention discloses a device for generating Q-modulated mode-locked noise square wave pulse. The device comprises a pumping light source, a wavelength division multiplexer, an Er-doped fiber, a first polarization controller, a second polarization controller, a polarization relevant isolator, a fiber coupler and a single-mode fiber, wherein an output end of the pumping light source is connectedwith a first input end of the wavelength division multiplexer, an output end of the wavelength division multiplexer is connected with an input end of the first polarization controller by the Er-dopedfiber, an output end of the first polarization controller is connected with an input end of the fiber coupler by the polarization relevant isolator, a first output end of the fiber coupler is connected with an input end of the second polarization controller by the single-mode fiber, and an output end of the second polarization controller is connected with a second input end of the wavelength division multiplexer. The Q-modulated mode-locked noise square wave pulse is generated by a joint effect of a non-linear polarization rotation effect and a high non-linear effect of a long single-mode fiber. The device can be applied to the field of supercontinuum spectrum generation, microstructure processing, medical treatment and the like.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a laser emitting device. Background technique [0002] Due to the advantages of good beam quality, small size, simple structure, and low cost, passive mode-locked fiber lasers have important application value in the fields of optical communication, optical fiber sensing, material processing, and biomedicine. Generally speaking, traditional mode-locked ultrashort pulses with Gaussian or hyperbolic secant shapes can be obtained in passively mode-locked fiber lasers, but by rationally adjusting the laser cavity structure and parameters, such as dispersion, loss, gain and nonlinearity, A noise-like pulse can be obtained. Noise-like pulse is a special mode-locked state in passively mode-locked fiber lasers. Its typical characteristics are as follows: 1) It is a wide wave packet in the time domain, and the interior of the wave packet is randomly evolved by many intensities and widths...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to use all-fiber devices to build all-fiber lasers, and use the nonlinear polarization rotation technology and the high nonlinear effect of long single-mode fibers to work together to achieve Q-switched mode-locked noise-like square-wave pulse output to solve the existing problems. The technical problem that the technology cannot output Q-modulated mode-locked noise pulses

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