研究目的
Investigating the generation of a dual-wavelength mode-locked laser using a tunable Mach-Zehnder filter and a single-wall carbon nanotube based saturable absorber for applications in ultrafast gas molecular spectroscopy and sensing.
研究成果
The proposed dual-wavelength mode-locked fiber laser demonstrates high stability and potential for applications in ultrafast gas molecular spectroscopy and sensing. The use of a TMZF and SWCNT-based SA provides a simple and robust method for generating dual-wavelength outputs with high optical-signal-to-noise ratios.
研究不足
The mode-locking threshold of the SA is approached at 166.1 mW, beyond which instabilities are observed. The setup's sensitivity to external perturbations and the need for polarization control are noted limitations.
1：Experimental Design and Method Selection
The study employs a thulium-doped fiber (TDF) based laser with a tunable Mach-Zehnder filter (TMZF) and a single-wall carbon nanotube (SWCNT) based saturable absorber (SA) to generate a dual-wavelength mode-locked output. The TMZF manipulates interference peaks to produce dual peaks with nearly equal magnitude.
2：Sample Selection and Data Sources
The active gain medium is a 4 m long TmdF2000 TDF. The SWCNT-based SA uses a polyvinyl alcohol (PVA) based substrate as the host material.
3：List of Experimental Equipment and Materials
Princeton Lightwave 450 1550 nm laser diodes (LDs),1550/2000 nm wavelength-division multiplexers (WDMs),1550 nm optical isolator (ISO),TmdF2000 TDF,Two-micron region optical isolator,90/10 tap coupler,Tunable Mach-Zehnder filter (TMZF),SWCNT thin film,Yokogawa AQ6375 optical spectrum analyzer (OSA),Thorlabs S302C optical power meter (OPM),Yokogawa DLM205 oscilloscope (OSC),Anritsu MS2683A radio-frequency spectrum analyzer (RFSA),818-BB-51 F Newport InGaAs based photodetector (PD)
4：Experimental Procedures and Operational Workflow
The cavity is pumped by two LDs in a bidirectional pumping scheme. The TMZF is used to produce dual peaks, and the SWCNT-based SA enables mode-locking. The output is analyzed using an OSA, OPM, OSC, and RFSA.
5：Data Analysis Methods
Optical spectrum analysis, pulse characteristics study, and measurement of optical power and signal-to-noise ratio.
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Thorlabs S302C optical power meter
S302C
Thorlabs
Optical power measurement
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Yokogawa DLM205 oscilloscope
DLM205
Yokogawa
Studying pulse characteristics
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Anritsu MS2683A radio-frequency spectrum analyzer
MS2683A
Anritsu
Studying pulse characteristics
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Yokogawa AQ6375 optical spectrum analyzer
AQ6375
Yokogawa
Optical spectrum analysis
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Princeton Lightwave 450 1550 nm laser diodes
450
Princeton Lightwave
Pumping the cavity in a bidirectional pumping scheme
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1550/2000 nm wavelength-division multiplexers
Not provided
Not provided
Multiplexing the pump and laser signals
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1550 nm optical isolator
Not provided
Not provided
Protecting the pump LDs from back-reflections
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TmdF2000 TDF
TmdF2000
Not provided
Active gain medium
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Two-micron region optical isolator
Not provided
Not provided
Ensuring unidirectional propagation of the laser signal
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90/10 tap coupler
Not provided
Not provided
Extracting a portion of the signal for characterization
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Tunable Mach-Zehnder filter
Not provided
Not provided
Producing dual peaks with nearly equal magnitude
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SWCNT thin film
Not provided
Centre for Advanced Photonics and Electronics (CAPE), University of Cambridge
Saturable absorber for mode-locking
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818-BB-51 F Newport InGaAs based photodetector
818-BB-51 F
Newport
Optical-to-electrical bridge
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