All-fiber structure laser system capable of generating high-energy femtosecond pulse

Abstract

The invention provides an all-fiber structure laser system capable of generating high-energy femtosecond pulse, aiming at solving the technical problems of low pulse energy and poor stability of the existing erbium-doped fiber laser. The all-fiber structure laser system comprises a ring laser used for generating high-energy pulse and single-mode fibers used for pulse compression, wherein the ring laser comprises a wavelength division multiplexer (WDM), an erbium-doped fiber, a first polarization controller, a polarization dependent isolator (PDI), a second polarization controller and an output coupler which are sequentially connected through the single-mode fibers in a cavity; the input end of the WDM is provided with a pump light source, the output end of the output coupler is connected with single-mode fibers arranged outside the cavity so as to compress high-energy pulse generated in the cavity. The laser system has the advantages of simple structure, low price, good stability and the like in application, in particular compared with the solid laser for generating high-energy femtosecond pulse, the laser system has the advantages of high pumping efficiency, convenient adjustment and the like and is easy to couple with fibers.

Description

technical field

[0001] The invention relates to an optical fiber laser system, in particular to an all-fiber structured laser system for generating high-energy femtosecond pulses. Background technique

[0002] Due to its simple structure, low cost, high stability and no need for optical path alignment, all-fiber lasers have been deeply studied and widely used in the fields of optical communication, supercontinuum generation, and medical treatment. Fiber lasers can work in different states, including continuous light output and pulse output. According to the different output pulse characteristics after mode-locking, the optical pulses currently studied are mainly divided into four categories. The first is a conventional soliton operating in the negative dispersion region. The self-starting mode-locked pulse output is achieved through the interaction of fiber anomalous dispersion and Kerr nonlinear effect in the fiber laser cavity to reach a balance state. However, due to t...

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