研究目的
Investigating the use of step-index multimode ?ber and graded-index ?ber (SIMF-GIMF) as a new saturable absorber (SA) based on nonlinear multimode interference (NL-MMI) for passively Q-switched all-?ber Yb-doped lasers.
研究成果
The study successfully demonstrates a passively Q-switched laser at 1 μm waveband based on the SIMF-GIMF structure, achieving stable pulse trains with significant output power and energy. The findings highlight the potential for higher single-pulse energy in ultrafast lasers by optimizing cavity length and multimode fiber parameters.
研究不足
The slope efficiency is lower than in the CW regime, and the Q-switched operation has a higher threshold pump power due to intracavity loss introduced by the SA.
1：Experimental Design and Method Selection:
The study employs a passively Q-switched all-?ber Yb-doped laser using SIMF-GIMF as a SA based on NL-MMI.
2：Sample Selection and Data Sources:
A piece of
3：8 m highly Yb-doped ?ber and a single mode ?ber of 1 m are used. List of Experimental Equipment and Materials:
Includes a 980 nm laser diode, wavelength-division multiplexer, polarization-independent isolator, polarization controllers, optical spectrum analyzer, digital oscilloscope, RF spectrum analyzer, and autocorrelator.
4：Experimental Procedures and Operational Workflow:
The SA is spliced in the ?ber laser cavity, and pump power is increased to generate Q-switched pulses.
5：Data Analysis Methods:
The output is monitored by various analyzers to measure pulse duration, repetition rate, output power, and optical spectrum.
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Optical spectrum analyzer
AQ6370D
Yokogawa
Monitors the optical spectrum of the laser output
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Digital oscilloscope
TDS 784D
Tektronix
Monitors the pulse trains
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RF spectrum analyzer
N9000A
Agilent Technologies
Analyzes the radio-frequency spectrum of the laser output
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Autocorrelator
Pulse Check SM1200
APE
Measures the pulse duration
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Yb-doped fiber
Coractive 6/125
Coractive
Gain medium in the laser cavity
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Single mode fiber
HI 1060
Transmission fiber in the laser cavity
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Laser diode
Pump source at 980 nm
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Wavelength-division multiplexer
980/1,060 nm
Combines pump and signal wavelengths
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Polarization-independent isolator
PI-ISO
Maintains unidirectional operation in the cavity
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Polarization controllers
Optimizes Q-switched operation and intracavity birefringence
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