研究目的
Investigating the generation and characteristics of dissipative soliton resonance (DSR) pulses in an all-polarization maintaining mode-locked Yb-doped fiber laser with a nonlinear amplifying loop mirror (NALM).
研究成果
The study successfully demonstrated the generation of 1040 nm polarized DSR pulses in an all-normal-dispersion fiber laser based on a NALM. The pulse duration was tunable from 288 ps to 1.38 ns with a maximum pulse energy of 20 nJ. The findings contribute to the understanding of DSR dynamics in all-normal-dispersion PM fiber lasers and offer a compact and cost-effective method for generating polarized DSR pulses around 1 μm.
研究不足
The study is limited by the technical constraints of the all-polarization maintaining fiber configuration, which may restrict the flexibility in adjusting polarization states to suppress pulse breaking. Additionally, the relatively low repetition rate and high main loop pump power make the system prone to soliton splitting before transforming into DSR pulses.
1：Experimental Design and Method Selection:
The experiment utilized an all-polarization maintaining mode-locked Yb-doped fiber laser with a nonlinear amplifying loop mirror (NALM) to generate DSR pulses. The laser cavity was built in a figure 8 configuration, incorporating a NALM loop as a saturable absorber for mode-locking.
2：Sample Selection and Data Sources:
The setup included a 75 m long PM passive fiber and 0.5 m high-concentration Yb-doped PM fiber in the NALM loop, and 1 m low-concentration Yb-doped PM fiber in the main loop as the gain medium.
3：5 m high-concentration Yb-doped PM fiber in the NALM loop, and 1 m low-concentration Yb-doped PM fiber in the main loop as the gain medium.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a 976 nm laser diode (LD), wavelength-division-multiplexer (WDM), pump laser protector (PLP), PM isolator, and output couplers (OC). Materials included PM-980-HP and PM-YSF-HI-HP fibers from Nufern.
4：Experimental Procedures and Operational Workflow:
The laser was operated by adjusting the pump power of the main loop and the NALM to achieve DSR mode-locking. Temporal and spectral characteristics of the output were analyzed using a photodetector, oscillator, optical spectral analyzer, RF signal analyzer, and autocorrelator.
5：Data Analysis Methods:
The analysis involved measuring pulse width, output power, pulse energy, peak power, and optical spectrum evolution with changes in pump power.
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