In this work, we employed gain-managed nonlinear amplification (GMNA) technology to achieve a pulse characterized by a smooth spectral profile and an exceptionally wide spectral bandwidth. Then this pulse was injected into a chirped pulse amplification (CPA) system for amplification, and a high energy, narrow pulse duration fiber laser system was successfully built. The initial seed source for system was a self-made mode-locked fiber oscillator that utilized a nonlinear amplifying loop mirror (NALM). This oscillator produced ultrashort pulses with a pulse duration of 10.96 ps at a repetition rate of 11.52 MHz. The spectral width of the mode-locked oscillator was significantly broadened from 5.83 nm to 63.97 nm using GMNA technology. Furthermore, the spectral profile, which initially exhibited severe oscillation structures, was reshaped into a smooth profile through the application of GMNA. Subsequently, the pulse energy was increased through CPA amplification. Finally, in the case of a central wavelength of 1064 nm and a repetition rate of 500 kHz, a pulse with an average power of 20.02 W, a single pulse energy of 40 μJ, a pulse duration of 179 fs, and a peak power of 224 MW was obtained. This fiber laser system has great prospect of application in clinical medicine and precision manufacturing due to its high energy and ultra-short pulse duration.
The study of pulse dynamics in fiber lasers is of great significance for the generation of high quality ultrashort pulses. Reasonable control of the intra-cavity dispersion can improve the pulse width, energy and noise characteristics. We report an all-polarization-maintaining (PM) dispersion managed thulium-doped fiber laser (TDFL) based on nonlinear amplified loop mirror. Conventional soliton, stretched-pulse soliton and dissipative soliton generation are demonstrated, when the oscillator operates with different net dispersion. Self-starting and stable mode-locked operation is achieved with different types of soliton pulses.
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