研究目的
To demonstrate a simple and reliable passively Q-switched thulium-doped fiber laser capable of generating an output with a peak wavelength at 1.8 μm for applications including biomedical surgery and polymer-based welding.
研究成果
A passively Q-switched laser operating at 1.8 μm is successfully generated using a TDF laser cavity with a SWNT-PVA based film as a saturable absorber. The laser achieves a maximum repetition rate of 67.9 kHz and a minimum pulse width of 1.2 μs, indicating its reliability and potential for near-infrared applications such as biomedical surgery and polymer welding.
研究不足
The output power is limited due to the use of components specified for two-micron lasers, which are not optimized for the 1.8 μm wavelength. The TBF could not fully suppress the background ASE at the 1.8 μm region, leading to a weak peak wavelength near the main lasing peak.
1：Experimental Design and Method Selection:
The setup utilizes a thulium-doped fiber (TDF) laser cavity with a tunable bandpass filter (TBF) and a single-walled carbon nanotube (SWNT) film saturable absorber (SA) for passive Q-switching.
2：Sample Selection and Data Sources:
A four-meter-long TmDF200 OFS gain medium with an absorption of ~20 dB/m at
3：55 μm is used. List of Experimental Equipment and Materials:
Includes a C-band Santec WSL-100 tunable laser source (TLS), Keopsys erbium-doped fiber amplifier (EDFA), 1550/2000 wavelength-division multiplexer (WDM), 2 μm isolator (ISO), tunable bandpass filter (TBF), SWNT-PVA based thin film saturable absorber, Yokogawa AQ6375 optical spectrum analyzer (OSA), Newport 818-BB-51F photodetector, Keysight DSOX3102T digital oscilloscope, Anritsu MS2683A radio-frequency spectrum analyzer (RFSA), and Thorlabs S302C optical power meter (OPM).
4：Experimental Procedures and Operational Workflow:
The TDF is pumped at
5：55 μm, and the laser output is adjusted using the TBF. The SWNT SA modulates the laser signal, and the output is analyzed for optical spectrum, time-domain, and frequency-domain characteristics. Data Analysis Methods:
The optical spectrum, pulse characteristics, and frequency spectrum are analyzed to evaluate the laser performance.
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Santec WSL-100 tunable laser source
WSL-100
Santec
Pump source for the thulium-doped fiber laser
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Yokogawa AQ6375 optical spectrum analyzer
AQ6375
Yokogawa
Observes the optical spectrum of the laser
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Keysight DSOX3102T digital oscilloscope
DSOX3102T
Keysight
Analyzes time-domain characteristics of the signal
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Anritsu MS2683A radio-frequency spectrum analyzer
MS2683A
Anritsu
Analyzes frequency-domain characteristics of the signal
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Thorlabs S302C optical power meter
S302C
Thorlabs
Measures the average output power of the laser
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TmDF200 OFS gain medium
OFS
Gain medium for the thulium-doped fiber laser
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Keopsys erbium-doped fiber amplifier
Keopsys
Amplifies the pump source signal
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1550/2000 wavelength-division multiplexer
Couples the pump source into the cavity
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2 μm isolator
Ensures unidirectional light circulation within the cavity
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tunable bandpass filter
Agiltron
Adjusts the optical emission of the TDF
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single-walled carbon nanotube film saturable absorber
Modulates the laser signal for passive Q-switching
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Newport 818-BB-51F photodetector
818-BB-51F
Newport
Converts optical signals to electrical signals for analysis
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