研究目的
Investigating the generation of harmonic condensed soliton phase in a passively mode-locked fiber laser using gold nanorods as a saturable absorber.
研究成果
The study successfully demonstrated the generation of harmonic condensed soliton phase in a passively mode-locked fiber laser for the first time. This extends the understanding of harmonic mode-locking and highlights the potential of gold nanorods as an effective saturable absorber.
研究不足
The study was limited to observing up to the 4th-order harmonic condensed soliton phase. Higher order harmonics could not be achieved, possibly due to limitations in the pump power and the aggregation of soliton pulses.
1：Experimental Design and Method Selection:
The study utilized a passively mode-locked fiber laser based on gold nanorods as a saturable absorber. The laser's operation was adjusted by varying polarization controllers and pumping power to observe different mode-locking patterns.
2：Sample Selection and Data Sources:
The laser cavity included an Erbium-doped fiber as the gain medium and a single mode fiber, with the total cavity length being
3：4 m. List of Experimental Equipment and Materials:
Equipment included a laser diode, wavelength division multiplexer, polarization-independent isolator, gold nanorods film, polarization controllers, output coupler, high-speed real-time oscilloscope, optical spectrum analyzer, and a commercial autocorrelator.
4：Experimental Procedures and Operational Workflow:
The experiment involved adjusting the pump power and polarization controllers to achieve different mode-locking states, including fundamental mode-locked pulse, condensed soliton phase, soliton rain, and harmonic condensed soliton phase.
5：Data Analysis Methods:
The characteristics of the output light pulses were analyzed using an oscilloscope, optical spectrum analyzer, and autocorrelator to verify the harmonic condensed soliton phase.
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autocorrelator
Femtochrome FR-103XL
Femtochrome
Measures the pulse duration of the output pulses.
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high-speed real-time oscilloscope
Keysight DSOS604A
Keysight
Analyzes the time domain characteristics of the output pulses.
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optical spectrum analyzer
Yokogawa AQ6317C
Yokogawa
Measures the optical spectrum of the output pulses.
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laser diode
LD
Pump source for the fiber laser.
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wavelength division multiplexer
WDM
Launches the pump light into the fiber laser.
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polarization-independent isolator
PI-ISO
Ensures unidirectional laser operation in the cavity.
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polarization controller
PC
Adjusts the polarization state within the laser cavity.
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output coupler
OC
Outputs a portion of the optical signal for detection.
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