研究目的
Investigating the generation of rectangular and step-like pulses in a mode-locked Raman fiber laser using a nonlinear optical loop mirror.
研究成果
High energy rectangular pulse generation from a Raman mode locked fiber laser is demonstrated for the first time. The proposed laser configuration provides a new method to obtain high-energy rectangular pulses at various wavelengths. Further numerical simulations will be carried out to improve understanding of the pulse formation.
研究不足
The laser becomes unstable beyond a pump power of 2.1 W. The step-like rectangular pulse generation mechanism is not fully understood and requires further numerical simulations.
1：Experimental Design and Method Selection
The Raman laser has a figure-8 configuration formed by two optical rings. A nonlinear optical loop mirror (NOLM) is used as an artificial saturable absorber to activate and maintain mode locking.
2：Sample Selection and Data Sources
The gain fiber is a piece of 80 m long PM Raman fiber. The pump laser is a linearly-polarized amplified spontaneous emission (ASE) source at 1064 nm with a spectral bandwidth of 2.5 nm.
3：List of Experimental Equipment and Materials
Polarization maintaining (PM) polarization dependent (PD) isolator,1064/1120 nm PM wavelength division multiplexers (WDM),25:75 PM fiber coupler,2×2 20:80 PM fiber coupler,PM Raman fiber (OFS Inc.),Optical spectrum analyzer (Yokogawa, AQ6370D),Oscilloscope (Keysight, DSO-S 254A),InGaAs detector (New Focus, 1414-50),Autocorrelator (APE PulseCheck, SM1200),RF spectrum analyzer (Keysight, N9020A)
4：Experimental Procedures and Operational Workflow
The mode locking is self-starting at a pump power of 2 W. Stable rectangular Raman pulses at fundamental repetition rate are obtained when the pump power is greater than 1.58 W. The pulse width and energy are measured at different pump powers.
5：Data Analysis Methods
The output spectrum is recorded by an optical spectrum analyzer. The pulse train is measured by an oscilloscope and an InGaAs detector. The autocorrelation trace is measured with a commercial autocorrelator. RF characteristics are analyzed by a RF spectrum analyzer.
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Optical spectrum analyzer
AQ6370D
Yokogawa
Recording the output spectrum of the Raman laser
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Oscilloscope
DSO-S 254A
Keysight
Measuring the pulse train of the Raman laser
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RF spectrum analyzer
N9020A
Keysight
Analyzing the RF characteristics of the Raman output
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InGaAs detector
1414-50
New Focus
Detecting the Raman laser output
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Autocorrelator
SM1200
APE PulseCheck
Measuring the autocorrelation trace of the Raman pulse
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