Dissipation soliton active mode-locking fiber laser

Abstract

The invention discloses a dissipation soliton active mode-locking fiber laser, and relates to the field of a laser. The laser comprises a strength modulator and a code pattern generator, which are mutually connected, wherein the code pattern generator inputs pulse sequence signals to the strength modulator; and the strength modulator is used for modulating under the driving of the pulse sequence signals. The dissipation soliton active mode-locking fiber laser provided by the invention inputs the pulse sequence signals to the strength modulator by using the code pattern generator, so as to modulate laser pulse. Furthermore, the high-energy mode-locking laser pulse output can be obtained, and the center wavelength of the output laser pulse can be moved within a large range; and the output laser pulse has flexible and adjustable pulse repeat frequency, and can accurately align an external clock.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a dissipative soliton active mode-locked fiber laser. Background technique [0002] Fiber ultrashort pulse lasers have the characteristics of small size, simple structure, flexible working medium, and convenient use. They are widely used in optical fiber communication, laser processing, medical equipment and other fields. [0003] figure 1 It is a structure diagram of an existing typical fiber laser. Such as figure 1 As shown, among them, Pump is the pump source, WDM is the wavelength division multiplexer, EDF is the erbium-doped fiber, PC is the polarization controller, PDI is the polarization dependent isolator, OC is the optical coupler, and Output is the output. [0004] This laser uses the nonlinear polarization rotation (NPE) effect. The principle is to use some nonlinear effects in the fiber (self-phase modulation, cross-phase modulation, dispersion effect) and a polariz...

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Problems solved by technology

If the soliton energy continues to increase, the peak power of the pulse will increase too quickly, and then the nonlinear phase shift in the cavity will exceed the limit that the pulse can withstand, resulting in the occurrence of wave splitting

[0007] The laser with this structure has the advantages of simple structure, self-starting and all-fiber structure. Its disadvantages and shortcomings are: 1. The pulse energy is low. Due to the existence of total negative dispersion in the cavity, the formation of solitons is in the nonlinear and Generated under the balance of dispersion, excessively high pulse energy produces strong nonlinearity, which will cause pulse splitting of solitons, thereby preventing further increase in pulse energy; 2. The structure is relatively fixed, and it is not easy to adjust the pulse repetition frequency; 3. The output wavelength is not easy to adjust

Its disadvantages are: 1. The wavelength is not easy to adjust; 2. Since the laser is in the form of passive mode locking, it is difficult to adjust the cavity length to change the repetition frequency of the pulse, and it is difficult to synchronize the pulse with the external clock; 3. Although its The wavelength can be adjusted, but the part of the laser cavity with the filter is a spatial structure, the structure is not flexible and needs to be aligned, and the pulse repetition frequency is not easy to adjust

The disadvantage is that this active mode-locked laser generally works at a high repetition rate, and the high repetition rate of the pulse limits the application of the laser with this structure in data acquisition (such as biological imaging, optical sampling oscilloscope), and the average power is not high. High repetition rates lead to very low energy single pulses under variable conditions

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