研究目的
To demonstrate an efficient dissipative soliton mode-locked fiber laser in the L-band using nonlinear polarization rotation technology, achieving high single pulse energy and broad bandwidth.
研究成果
The study successfully demonstrates a broadband high-energy dissipative soliton mode-locked fiber laser in the L-band, achieving a record single pulse energy of 6.15 nJ. The laser's performance is attributed to the effective gain bandwidth of the EDF and the intracavity birefringent filtering effect.
研究不足
The study is limited by the pump power available and the need for precise polarization state optimization to achieve mode-locking and high pulse energy. The efficiency and stability of the laser could be further improved.
1：Experimental Design and Method Selection
The study employs nonlinear polarization rotation (NPR) technology for mode-locking in a fiber laser operating in the L-band. The design includes a normal dispersion erbium-doped fiber (EDF) as the gain medium and utilizes polarization controllers and a polarization-dependent isolator for mode locking.
2：Sample Selection and Data Sources
A 9.5 m normal dispersion EDF (Fibercore, I-25(980/125)) is used as the gain medium. The laser is pumped by a 976 nm laser diode.
3：List of Experimental Equipment and Materials
Equipment includes a 976 nm laser diode, wavelength division multiplexer, polarization controllers, polarization-dependent isolator, output coupler, optical spectrum analyzer, real-time oscilloscope, high-speed photodetector, RF spectrum analyzer, and autocorrelator.
4：Experimental Procedures and Operational Workflow
The laser is pumped to achieve continuous wave operation, then mode-locked by adjusting the polarization controllers. The output characteristics are measured at various pump powers.
5：Data Analysis Methods
Output characteristics such as spectral bandwidth, pulse width, and output power are analyzed as functions of pump power. The pulse is compressed outside the cavity, and its characteristics are measured.
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High-speed photodetector
DSC10H
DiscoverySemi
Detection of the laser output pulses
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RF spectrum analyzer
CSA N1996A
Agilent
Measurement of the laser output RF spectrum
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Autocorrelator
FR-103XL
Femtochrome
Measurement of the laser output pulse width
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Optical spectrum analyzer
AQ6370
Yokogawa
Measurement of the laser output spectrum
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Real-time oscilloscope
WaveRunner 620Zi
LeCroy
Measurement of the laser output pulse train
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Erbium-doped fiber
I-25(980/125)
Fibercore
Gain medium for the fiber laser
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Laser diode
976 nm
Not provided
Pump source for the fiber laser
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