研究目的
Demonstrating a passively mode-locked all-fiber Tm laser using a no-core-graded-index multimode fiber structure as a saturable absorber based on the nonlinear multimode interference.
研究成果
The compact all-fiber laser emitted stable mode-locked soliton pulses centered at 1895.7 nm with a spectral width of 3.3 nm and a pulse width of 1.25 ps. The experimental results show that such a SMF-NCF-GIMF-SMF SA structure could find applications in simple all-fiber mode-locking ultrafast lasers at 2 μm wavelength region.
研究不足
The study does not discuss the scalability of the method to other wavelengths or the potential for integration into existing optical systems. Additionally, the environmental stability of the setup under varying conditions is not addressed.
1：Experimental Design and Method Selection:
The study utilized a passively mode-locked all-fiber Tm laser with a no-core-graded-index multimode fiber structure as a saturable absorber based on nonlinear multimode interference.
2：Sample Selection and Data Sources:
A 2 m length of Tm-doped single-mode fiber was used as the lasing gain at 2 μm, pumped by a 1570 nm continuous-wave fiber laser.
3：List of Experimental Equipment and Materials:
The setup included a 1550/2000 nm wavelength-division multiplexing (WDM), a polarization insensitive isolator (ISO), an in-line polarization controller (PC), a coupler with a 10% output, and an SMF-NCF-GIMF-SMF device.
4：Experimental Procedures and Operational Workflow:
The laser output was connected to an optical spectrum analyzer and a 1 GHz oscilloscope together with a
5：5 GHz photodetector for simultaneous measurement of the spectra and the pulse train. Data Analysis Methods:
The output soliton pulses were characterized by their center wavelength, spectral width, pulse duration, and repetition rate.
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