研究目的
Investigating the use of topological insulator Bismuth Selenide (Bi2Se3) as a saturable absorber in Erbium-doped fiber lasers for generating Q-switched and mode-locked pulses.
研究成果
The study successfully demonstrated stable Q-switched and mode-locked pulses using Bi2Se3 as a saturable absorber in an EDFL. The results suggest that Bi2Se3 SA is a viable, low-cost alternative for generating pulsed fiber lasers with potential applications in photonics.
研究不足
The Q-switching threshold was limited to 52.8 mW, and the pulse width could potentially be further decreased with higher pump power. The mode-locked pulse width was slightly chirped, indicating room for optimization in the SA fabrication process.
1：Experimental Design and Method Selection
The experiment involved the fabrication of a Bi2Se3 SA via the optical deposition method and its incorporation into an Erbium-doped fiber laser (EDFL) cavity to generate Q-switched and mode-locked pulses.
2：Sample Selection and Data Sources
Bi2Se3 was dissolved in isopropyl alcohol, stirred, and ultrasonicated to form a composite. The SA was then deposited on a fiber pigtail.
3：List of Experimental Equipment and Materials
1480 nm laser diode (LD), wavelength division multiplexer (WDM), polarization controller (PC), isolator, 95:5 coupler, optical spectrum analyzer (OSA-Yokogawa AQ6370B), oscilloscope (Tektronix TDS3052C), photodetector (Thorlab DET01CFC), and Alnair intensity based autocorrelator.
4：Experimental Procedures and Operational Workflow
The EDFL was pumped by a 1480 nm LD via a WDM. The SA was incorporated into the cavity, and the output was analyzed using OSA, oscilloscope, and RF spectrum analyzer. For mode-locking, an additional 5 m SMF was inserted into the cavity.
5：Data Analysis Methods
The pulse characteristics were analyzed using the oscilloscope and autocorrelator. The stability and noise levels were assessed using the RF spectrum analyzer.
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photodetector
DET01CFC
Thorlab
Converting optical signals to electrical signals for analysis
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optical spectrum analyzer
AQ6370B
Yokogawa
Spectral analysis of the pulsed EDFL
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oscilloscope
TDS3052C
Tektronix
Observing the output pulse train
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laser diode
1480 nm
Not provided
Pumping the Erbium-doped fiber
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autocorrelator
Not provided
Alnair
Measuring the pulse width of the mode-locked operation
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