研究目的
Investigating the use of pure gold saturable absorber (Au-SA) for generating Q-switching pulses at 2 μm in Thulium-doped fiber laser cavity.
研究成果
The study successfully demonstrated the use of pure gold saturable absorber (Au-SA) for generating Q-switching pulses at 2 μm in a Thulium-doped fiber laser cavity. The results indicate the potential of Au in pulse generation and saturable absorption in appropriate laser applications, offering a simple and low-cost solution for environmental sensing and biomedical diagnostics.
研究不足
The study was limited by the maximum available pump power of 1 W, which may not fully exploit the optical damage threshold of Au nanospheres. The pulse-to-pulse amplitude fluctuation was about 40%, indicating instability in the Q-switching operation.
1：Experimental Design and Method Selection:
The study employed a ring cavity laser configuration with Thulium-doped fiber (TDF) as a gain medium and a homemade Erbium/Ytterbium co-doped fiber laser as a pump source. The Au-SA was fabricated by depositing gold particles on a polyvinyl alcohol (PVA) film using electron beam evaporation.
2：Sample Selection and Data Sources:
The TDF used has a numerical aperture (NA) of 0.15 with core and cladding diameter of 9 μm and 125 μm respectively. The peak core absorption of the fiber was around 9.3 dB/m at 1180 nm and 27 dB/m at 793 nm.
3：15 with core and cladding diameter of 9 μm and 125 μm respectively. The peak core absorption of the fiber was around 3 dB/m at 1180 nm and 27 dB/m at 793 nm. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a 1550/2000 nm wavelength division multiplexer (WDM), 5 m long TDF, 10 dB optical coupler, EOT ET-5010F InGaAs photodetector (PD), 500 MHz LeCroy Wavejey 352A digital oscilloscope, 7.8 GHz RF spectrum analyzer (Anritsu MS2683A), and optical spectrum analyzer (OSA) (AQ6375).
4：8 GHz RF spectrum analyzer (Anritsu MS2683A), and optical spectrum analyzer (OSA) (AQ6375). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The Au-SA was integrated into the laser cavity, and the output was monitored using the PD and oscilloscope. The laser's performance was analyzed in terms of repetition rate, pulse width, output power, and pulse energy.
5：Data Analysis Methods:
The data was analyzed to determine the laser's performance characteristics, including repetition rate, pulse width, output power, and pulse energy.
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