研究目的
Investigating the development of an all polarization-maintaining dual-wavelength mode-locked fiber laser based on a Sagnac loop filter for high precision dual-comb applications.
研究成果
The all-PM dual-wavelength passively mode-locked Er-fiber laser demonstrates a robust and controllable dual-wavelength mode-locking with a ~1 kHz offset repetition rate, paving the way for practical dual-comb applications in the near future.
研究不足
The triple-wavelength mode-locking operation is observed but unstable due to strong gain competition effect, limiting the practical applications to dual-wavelength mode-locking.
1：Experimental Design and Method Selection
The laser is based on a linear cavity using an NALM as one end-mirror, incorporating a nonlinear amplifying loop mirror with an intracavity nonreciprocal phase shifter for self-started mode-locking.
2：Sample Selection and Data Sources
A short segment of PM fiber is angle-spliced to the NALM to function as a PM Sagnac loop filter.
3：List of Experimental Equipment and Materials
Wavelength-division multiplexer (WDM), fiber-pigtailed polarization beam splitter (PBS1, Thorlabs, PBC1550PM), Erbium-doped fiber (EDF) (nLight Liekki, Er80-4/125-HD-PM), single mode laser diode operating at 980 nm, fiber collimator (COL), nonreciprocal phase shifter, polarization beam splitter cube (PBS2), quarter waveplate (QWP2), full-reflective mirror (M).
4：Experimental Procedures and Operational Workflow
The laser operates at stretched-pulse mode-locking regime. The output coupling ratio and intra-cavity loss are finely tuned by QWP2 to achieve switchable single-wavelength or dual-wavelength mode-locking states.
5：Data Analysis Methods
The output spectrum is continuously recorded within 90 min to investigate the long-term stability. The repetition rate difference between the two mode-locking pulse trains is recorded with a frequency counter.
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optical spectrum analyzer
AQ6370D
YOKOGAWA
Used for measuring the spectrum of the output pulse train.
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digital oscilloscope
Infiniium
Agilent
Used for recording the temporal walk-off between the two pulse trains.
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InGaAs amplified photodetector
PDA20CS-EC
Thorlabs
Used for detecting the beat of the output pulse train repetition rates.
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frequency counter
53220A
Agilent
Used for recording the beat frequency between the two repetition rates.
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polarization beam splitter
PBC1550PM
Thorlabs
Used for combining beams counter-circulating in the NALM.
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Erbium-doped fiber
Er80-4/125-HD-PM
nLight Liekki
Used as the gain fiber in the laser cavity.
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radio frequency spectrum analyzer
DSA815
RIGO
Used for measuring the radio frequency (RF) spectra of the fundamental repetition rates.
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