研究目的
Investigating the realization of an all-fiber dual-wavelength dual-comb mode locked fiber laser using a Sagnac fiber loop mirror.
研究成果
The dual-wavelength dual-comb mode locked fiber laser simplifies dual-comb spectroscopy systems by providing two asynchronous mode locked pulse trains with a repetition rate difference of 218 Hz.
研究不足
The technical constraints include the need for precise adjustment of polarization controllers and the specific birefringence of the polarization maintaining fiber. Potential areas for optimization could involve reducing the pump power requirement or increasing the stability of the mode locking.
1：Experimental Design and Method Selection:
The laser cavity consists of a semiconductor saturable absorber, a 980/1550 wavelength division multiplexing, 80 cm Erbium-doped fiber, a 10/90 optical coupler, and a Sagnac loop mirror. The Sagnac loop mirror acts as a periodic filter forcing the laser mode-locking with two different central wavelengths.
2：Sample Selection and Data Sources:
The experiment uses a piece of 0.73 m polarization maintaining fiber with birefringence of 4.6×10-
3：73 m polarization maintaining fiber with birefringence of 6×10-List of Experimental Equipment and Materials:
4. 3. List of Experimental Equipment and Materials: Semiconductor saturable absorber, 980/1550 wavelength division multiplexing, Erbium-doped fiber, optical coupler, Sagnac loop mirror, polarization controllers, polarization maintaining fiber.
4：Experimental Procedures and Operational Workflow:
Self-start mode locking is obtained with pump power of ~60 mW. Adjusting the polarization controllers allows observation of mode locking with two separated smooth spectral peaks.
5：Data Analysis Methods:
The spectrum and RF spectrum of the dual-wavelength mode-locked laser are analyzed to determine the central wavelengths and repetition rate difference.
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semiconductor saturable absorber
Acts as a saturable absorber to initiate mode locking in the fiber laser.
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980/1550 wavelength division multiplexing
Used for combining or separating light at 980 nm and 1550 nm wavelengths.
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Erbium-doped fiber
Acts as the gain medium in the fiber laser.
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optical coupler
10/90
Splits the optical power into 10% and 90% outputs.
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Sagnac loop mirror
Acts as a periodic filter forcing the laser mode-locking with two different central wavelengths.
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polarization controllers
Used to adjust the polarization state of the light in the Sagnac loop mirror.
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polarization maintaining fiber
Used in the Sagnac loop mirror to maintain the polarization state of the light.
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