研究目的
To propose and demonstrate a tunable passively Q-switched erbium-doped fiber laser with ultranarrow linewidth using single wall carbon nanotubes (SWCNTs) as the passive Q-switch and an ultranarrow tunable bandpass filter (UNTBF) for spectral filtering effect.
研究成果
The proposed system successfully demonstrates a tunable passively Q-switched erbium-doped fiber laser with an ultranarrow linewidth of 17.5 kHz, tunable over a wavelength range of 36 nm. The Q-switched operation is stable, with repetition rates ranging from 5.8 kHz to ~38 kHz and pulse widths from 1.15 μs to 8.12 μs. This represents a significant advancement in the field of Q-switched fiber lasers, offering potential applications in radar, telecommunication, spectroscopy, and optical coherent detection.
研究不足
The high insertion loss of the UNTBF (~20 dB) contributes to the low average output power obtained in this work. The system possibly exceeds its optimal operating point above a certain intracavity power, leading to a slight drop in pulse energy at maximum pump power.
1：Experimental Design and Method Selection:
The experiment involves the use of a ~
2：0 m long MetroGain-12-type erbium-doped fiber (EDF) as the gain medium, pumped by a 980 nm laser diode. The setup includes a wavelength-division multiplexer (WDM), optical isolator, SWCNT-based saturable absorber (SA), and an ultranarrow tunable bandpass filter (UNTBF) for spectral filtering. Sample Selection and Data Sources:
The EDF has an erbium ions concentration of 960 ppm. The output signal is analyzed using an optical spectrum analyzer (OSA) and a photo detector connected to an oscilloscope.
3：List of Experimental Equipment and Materials:
Equipment includes a 980 nm laser diode, WDM, EDF, optical isolator, SWCNT-based SA, UNTBF, optical coupler, OSA, and oscilloscope.
4：Experimental Procedures and Operational Workflow:
The setup is configured to allow unidirectional propagation of light within the ring cavity, with the SWCNT-based SA enabling Q-switched pulses and the UNTBF ensuring ultranarrow linewidth operation.
5：Data Analysis Methods:
The properties of the Q-switched pulse train are measured using the oscilloscope, and the spectral characteristics are analyzed using the OSA.
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Optical spectrum analyzer
AQ63703
Yokogawa
Analyzes the spectral characteristics of the laser output.
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Photo detector
D400 FC
Thorlabs
Detects the optical signal for analysis on the oscilloscope.
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Oscilloscope
352A
LeCroy
Measures the properties of the produced Q-switched pulse train.
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MetroGain-12-type erbium-doped fiber
Used as the gain medium in the fiber laser setup.
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980 nm laser diode
Pumps the erbium-doped fiber to achieve population inversion.
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Wavelength-division multiplexer
980/1550 nm
Combines the pump light from the laser diode with the signal light in the fiber.
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Optical isolator
Ensures unidirectional propagation of light within the ring cavity.
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Single-wall carbon nanotubes saturable absorber
Acts as the passive Q-switch to generate Q-switched pulses.
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Ultra narrow tunable bandpass filter
XTM-50
Yenista
Provides spectral filtering effect to achieve ultranarrow linewidth operation.
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Optical coupler
Splits the signal for output and feedback into the cavity.
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