研究目的
Investigating the effects of incorporating a microfiber knot resonator (MKR) on the mode-locking regime transformation in an erbium-doped fiber (EDF) laser, focusing on spectral and temporal characteristics.
研究成果
The incorporation of a microfiber knot resonator (MKR) in an erbium-doped fiber (EDF) laser enabled mode-locking regime transformation from femtosecond solitons to narrow-band, in-tune switchable, nanosecond pulses. The MKR acted as a comb-like, sharp-rolloff bandpass filter, greatly eliminating longitudinal laser modes. This demonstrated the potential of MKR in fiber lasers for pre-defined spectral and temporal characteristics through spectral tailoring.
研究不足
The study was limited by the tuning range of the current NPR configuration and the permitted emission spectral range due to various filtering or suppressing effects within the EDF laser. The number of achievable in-tune-switchable wavelengths was also limited.
1：Experimental Design and Method Selection:
The study involved incorporating a house-made microfiber knot resonator (MKR) into an erbium-doped fiber (EDF) laser to achieve mode-locking regime transformation. The methodology included using nonlinear polarization rotation (NPR) as the mode-locker and analyzing the spectral and temporal characteristics of the emitted pulses.
2：Sample Selection and Data Sources:
The experiment utilized an EDF laser with a pump light provided by a 980 nm laser diode. The MKR was fabricated using a flame-brushing method on a fiber tapering workstation.
3：List of Experimental Equipment and Materials:
Equipment included a fiber tapering workstation (IPCS-5000, Idealphotonics Inc.), a broadband amplified spontaneous emission (ASE) source (ASE-FL7004, FiberLabs Inc.), an optical spectrum analyzer (OSA, AQ6370C, Yokogawa Test & Measurement Co., Japan), and an autocorrelator (FR-103HS (XL), Femtochrome Research, Inc.).
4：Experimental Procedures and Operational Workflow:
The MKR was incorporated into the EDF laser, and the effects on pulse duration and spectral bandwidth were measured. The intra-cavity polarization state was manipulated to achieve wavelength switching.
5：Data Analysis Methods:
The number of longitudinal lasing modes and the elimination factor were calculated using theoretical models. The spectral and temporal characteristics of the pulses were analyzed using the OSA and autocorrelator.
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