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.
In this work, we report the fabrication and characterization of a 5-tubes nested hollow-core anti-resonant fiber (Nested HC-ARF), which exhibits outstanding optical performance in terms of a record attenuation value of 0.85 dB/km at 2 μm wavelength and excellent modal. The power handling capability of Nested HC-ARF is also firstly demonstrated in this work. The maximum average power of 60.5 W at 2 μm has been transmitted through the fabricated Nested HC-ARF in robustly single-mode fashion without introducing any damage to the input and output fiber end-faces, which represent the highest average power delivered by HCF in this wavelength, to the best of our knowledge.
Frequency-sweeping lasers have drawn considerable attentions, especially in FMCW LIDAR. The frequency sweeping single-frequency PM fiber laser is respectively realized by piezoelectric (PZT) modulation and pump modulation, which using the same Er-doped distributed Bragg reflection (DBR) fiber cavity. The central wavelength is 1552.49 nm with the extinction ratio of above 20 dB. The frequency sweeping range of PZT modulation is seen to be up to 745 MHz under the modulation repetition rate of 1Hz, and the modulation repetition rate of the pump can be tuned from 1Hz to 20 kHz. However, the frequency sweeping range and tunable range of pump modulation is 635 MHz and from 1Hz to 10 kHz, respectively. Comparing with both methods, the PZT modulation has wider sweeping range and tunable range, however, the mechanical resonance will be occurred. The pump modulation indicates virtually linearly frequency modulation. Future works to achieve more characteristic of two modulation methods are undergoing.
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