研究目的
Investigating the generation of two-color high-order transverse mode pulses in a mode-locked all-fiber laser using a common mode-selective coupler (MSC).
研究成果
The study successfully demonstrates a mode-locked all-fiber laser emitting two-color high-order modal pulses using a dual-channel MSC. The laser shows stable operation at 1.0 and 1.5 μm wavelengths with high mode purity, offering potential applications in ultrafast optics and structured light generation.
研究不足
The study is limited by the wavelength band limitation of the MSC mode converters, requiring customization for different lasing wavelengths. The coupling efficiencies and mode purity may vary with environmental perturbations.
1：Experimental Design and Method Selection:
The study involves designing a dual-channel MSC for simultaneous mode conversion at
2：0 and 5 μm wavelengths. The laser setup includes two ring cavities (Yb-doped and Er-doped fiber lasers) combined with a common MSC. Sample Selection and Data Sources:
The MSC is fabricated using standard single-mode fiber (SMF) and few-mode fiber (FMF). The laser output is characterized using optical spectrum analysis, spatial mode distribution imaging, and RF spectrum analysis.
3：List of Experimental Equipment and Materials:
Includes Yb-doped fiber (LIEKKI Yb1200-4/125), Er-doped fiber, 980 nm laser diodes, wavelength division multiplexers (WDMs), polarization-dependent isolators (PD-ISOs), optical spectrum analyzer (YOKOGAWA, AQ6370C), photodetector, oscilloscope (Tektronix, MSO 4104), and electronic spectrum analyzer (Agilent E4407B).
4：Experimental Procedures and Operational Workflow:
The MSC is fabricated by tapering and fusing SMF and FMF. The laser cavities are pumped to initiate mode-locking, and the output is analyzed for mode patterns, spectra, and pulse characteristics.
5：Data Analysis Methods:
The mode patterns are imaged using a CCD camera, spectra are measured with an optical spectrum analyzer, and pulse trains are recorded with an oscilloscope.
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oscilloscope
MSO 4104
Tektronix
Recording the time domain waveform
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electronic spectrum analyzer
E4407B
Agilent
Monitoring the radio frequency (RF) spectrum
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CCD camera
C10633-23
Hamamtsu Photonics
Imaging the collimated output beam
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optical spectrum analyzer
AQ6370C
YOKOGAWA
Measuring the laser spectrum
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