研究目的
Investigating the wavelength tunability of passively Q-switched erbium-doped fiber laser using Tin(IV) Oxide (SnO2) as a saturable absorber.
研究成果
The SnO2-SA is a suitable and cost-effective solution for broadband tunable laser applications with a relatively simple fabrication process. The experimental results suggest that SnO2-SA can be used for broadband tunable pulsed laser applications.
研究不足
The tuning range is limited by the range of the tunable bandpass filter and the gain provided by the erbium-doped fiber. The Q-switching operation becomes unstable at pump powers higher than 94 mW.
1：Experimental Design and Method Selection:
The study involved the fabrication of a saturable absorber by compositing SnO2 nanoparticle with polyvinyl alcohol (PVA) and incorporating it into a laser cavity.
2：Sample Selection and Data Sources:
The SnO2-PVA film was used as the saturable absorber.
3：List of Experimental Equipment and Materials:
Equipment included a 980-nm laser diode, wavelength-division multiplexer (WDM), erbium-doped fiber (EDF FiberCore MetroGain M-12), polarization controller (PC), optical polarization-independent isolator (PI-ISO), optical coupler (OC), tunable bandpass filter (TBF, Agiltron FOTF 025121932), optical spectrum analyzer (OSA, YOKOGAWA AQ6370), photodetector (THORLABS PDA50B-EC), real time oscilloscope (LECROY WA-232), optical power meter (THORLABS S144C), and RF spectrum analyzer (ANRITSU MS2683A).
4：Experimental Procedures and Operational Workflow:
The SnO2-PVA film was sandwiched between two fiber ferrules in the laser cavity. The laser was pumped by a 980-nm laser diode, and wavelength tuning was achieved using a tunable bandpass filter.
5：Data Analysis Methods:
The output spectrum, optical pulse, optical power, and radio frequency (RF) spectrum were monitored and analyzed.
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optical power meter
S144C
THORLABS
Measuring the optical power
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RF spectrum analyzer
MS2683A
ANRITSU
Analyzing the RF spectrum
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optical spectrum analyzer
AQ6370
YOKOGAWA
Monitoring the optical spectrum
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photodetector
PDA50B-EC
THORLABS
Detecting the optical pulse
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laser diode
980-nm
Pumping the fiber laser
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wavelength-division multiplexer
980/1550
Multiplexing the laser diode pump and the laser signal
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erbium-doped fiber
FiberCore MetroGain M-12
Gain medium for the laser
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polarization controller
Optimization of the laser output
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optical polarization-independent isolator
PI-ISO
Enabling unidirectional laser oscillation in the laser cavity
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optical coupler
OC
Extracting the output power and feedback into the laser cavity
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tunable bandpass filter
FOTF 025121932
Agiltron
Achieving wavelength tuning
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real time oscilloscope
WA-232
LECROY
Displaying the optical pulse
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