研究目的
To demonstrate an all-fiber passively mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45°-plane-by-plane-tilted fiber grating as an in-line fiber polarizer.
研究成果
The study successfully demonstrates an all-fiber passively mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45°-plane-by-plane-tilted fiber grating. The laser produces stable soliton pulses at 1870 nm with a pulse width of 862 fs and a fundamental repetition rate of 22.34 MHz. The 45°-TFG proves to be an effective in-line fiber polarizer for mode-locking, with potential for further optimization in design parameters to improve performance.
研究不足
The insertion loss of the 45°-TFG is relatively high at 5 dB at 1870 nm, which is a research-stage component limitation. The bandwidth of the photodiode used limits the RF spectrum analysis.
1：Experimental Design and Method Selection:
The study employs a novel 45°-plane-by-plane-tilted fiber grating inscribed by a femtosecond laser as an in-line fiber polarizer in a passively mode-locked thulium-doped fiber laser. The grating is characterized for polarization-dependent loss.
2：Sample Selection and Data Sources:
A standard single-mode fiber (SMF-28) is used for inscribing the 45°-TFG. The laser setup includes a thulium-doped silica fiber and other standard components.
3：List of Experimental Equipment and Materials:
The setup includes an erbium-doped fiber laser, wavelength division multiplexer, polarization-independent optical isolator, thulium-doped fiber, polarization controller, 45°-TFG, and various measurement devices.
4：Experimental Procedures and Operational Workflow:
The laser is pumped at 1565 nm, and mode-locking is achieved by adjusting the polarization controller. The output is characterized using a spectrometer, oscilloscope, RF spectrum analyzer, photodiode, and autocorrelator.
5：Data Analysis Methods:
The optical spectrum, pulse duration, RF spectrum, and pulse train are analyzed to confirm stable mode-locking operation.
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Photodiode
PDA20D
Thorlabs
Used to detect the laser output for analysis.
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SMF-28
Standard single-mode fiber used for inscribing the 45°-TFG.
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EDFL
Erbium-doped fiber laser used as a pump source.
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WDM
1560/2000
Wavelength division multiplexer used to couple the pump laser with the active fiber.
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ISO
Polarization-independent optical isolator ensuring unidirectional laser operation.
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TDF
Thulium-doped silica fiber used as the active medium in the laser.
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PC
Polarization controller used to adjust the polarization state for mode-locking.
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45°-TFG
45°-plane-by-plane-tilted fiber grating used as an in-line fiber polarizer.
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OC
50:50
Output coupler used to extract the laser for characterization.
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Spectrometer
MIRIAD S3
Used to monitor the laser output characteristics.
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Oscilloscope
LeCroy HDO6304
High-definition oscilloscope used for laser output characterization.
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RF spectrum analyzer
Used to analyze the RF spectrum of the laser output.
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Autocorrelator
MiniScan-200PS
Used to measure the pulse duration of the laser output.
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