研究目的
Exploring the mode-locking evolution mechanism of a dual-ring fiber laser to aid future optimal design for dual comb applications.
研究成果
The experimental exploration of the ML evolution mechanism provides a deeper understanding of the ML principle in the dual-ring fiber laser that will aid the optimization of the generation and preservation of the dual combs in a single cavity. The proposed dual-ring structure and the revealed ML principle are believed to find application in dual-comb laser ranging or dual-comb spectroscopy.
研究不足
The study acknowledges the undersampling due to the rotation step set to 2° and the different intracavity losses as reasons for the different upper limits of the detachment thresholds for the two subrings.
The experimental setup involved a dual-ring fiber laser composed of a shared main path and two subpaths connected by a pair of polarization-independent, three-port circulators. The laser was bidirectionally pumped by two laser diodes via two 980/1550 nm filter wavelength-division multiplexers. The mode-locked pulse lasers were generated with a transmission-type semiconductor saturable absorber in each subpath. The intracavity energy of each subpath was adjusted with an integrated setup consisting of a polarizing beam splitter, two quarter-wave plates, and a half-wave plate. The output pulses were extracted from the cavity by optical couplers with a 10% output ratio. The performances of the generated pulse trains were detected with photodetectors, an oscilloscope, an optical spectrum analyzer, and an optical autocorrelator.
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photodetectors
PDA05CF2
Thorlabs
Used to detect the performances of the generated pulse trains.
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oscilloscope
MSO9254A
Keysight Technologies
Used to monitor the time domain properties of the pulses.
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optical spectrum analyzer
MS9740A
Anritsu
Used to monitor the optical spectrum of the pulses.
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optical autocorrelator
FR–103XL
Femtochrome
Used to analyze the autocorrelation trace.
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spectrum analyzer
N9010A
Agilent Technologies
Used to measure the repetition rate of the pulse trains.
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frequency counter
53230A
Agilent Technologies
Used to measure the repetition rate of the pulse trains.
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optical power meter
PM320E
Thorlabs
Used to measure the average power of the pulse trains.
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erbium-doped fiber
LIEKKI Er110
Used as the gain medium in the main path of the dual-ring fiber laser.
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laser diodes
LD–1 and LD–2
Used for bidirectional pumping of the erbium-doped fiber.
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filter wavelength-division multiplexers
FWDM–1 and FWDM–2
Used to transmit light near 1550 nm and to reflect light near 980 nm.
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semiconductor saturable absorber
BATOP SA–1550–25–2ps–x
Used for passive mode-locking of the dual-ring fiber laser in the corresponding subpath.
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polarizing beam splitter
PBS
Used to adjust the intracavity energy of each subpath.
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quarter-wave plates
QWP–1, QWP–2, QWP–3, QWP–4
Used to adjust the intracavity energy of each subpath.
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half-wave plate
HWP–1, HWP–2
Used to adjust the intracavity energy of each subpath.
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collimators
Used to guide the laser through the cage setup in each subpath.
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optical couplers
OCs
Used to extract the output pulses from the cavity.
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