研究目的
Demonstrating a novel single-soliton ultra-low pulse repetition frequency passively mode-locked erbium-doped fiber laser with strict polarization control.
研究成果
The fiber ring laser with decreased net nonlinear polarization rotation and strict polarization control generates a 4.7 ps soliton with a repetition rate of 192.12 kHz. The intracavity average power was 29 μW, which gives the pulse energy of 150.9 pJ and estimated peak power of ~30.8 W. Such ultra-low repetition rate as well as short pulse width makes this mode-locked all-fiber laser a suitable oscillator for biomedical diagnostics and micromachining.
研究不足
The generation of solitons with low pulse repetition frequency is challenging due to the tendency of long fiber lasers to generate multiple solitons in the cavity or pulses with complex waveforms. The technique requires fibers with low nonlinearity and strict control of polarization.
The experimental setup includes a double-pass amplifier (DPA), a double-pass nonlinear segment (DPNS), and elements connecting these two principal sections. The DPA includes a 45-cm long M-12 erbium-doped fiber (EDF) pumped at 980 nm through a 980/1550 nm wavelength-division multiplexer (WDM), a Faraday mirror (FM), and a polarizing beam splitter (PBS). The DPNS is built of a circulator C1, a 500-m long twisted SMF-28 fiber, and a circulator C2. Light entering through the port 1 of C1 passes to the port 2 without any ellipticity change, then it propagates through the 500-m long SMF-28 twisted fiber where NPR effect occurs. The fiber was twisted with the twist rate of 6 turns/m and wounded on a 50-cm diameter cylinder.
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M-12 erbium-doped fiber
M-12
Thorlabs
Used as the gain medium in the double-pass amplifier section of the laser.
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In-line polarization controller
PLC-900
Thorlabs
Used to adjust the polarization ellipticity through the pressure applied to the fiber.
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Optical spectrum analyzer
MS9710A
Anritsu
Used to measure the optical spectrum.
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Oscilloscope
54845A
Agilent
Used to visualize the output pulses.
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Polarimeter
PAX5710R3-T
Thorlabs
Used to monitor the polarization state inside the cavity.
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980/1550 nm wavelength-division multiplexer
Used to pump the erbium-doped fiber at 980 nm.
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Faraday mirror
Used to reflect light and turn the polarization of the reflected light to orthogonal to the incident light.
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Polarizing beam splitter
Used to split the light into linearly polarized components.
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50/50 coupler
Used to split the light into two equal parts.
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Circulator
C1, C2
Used to direct light in a specific direction within the double-pass nonlinear segment.
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SMF-28 fiber
SMF-28
Used as the nonlinear medium in the double-pass nonlinear segment where NPR effect occurs.
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Autocorrelator
FR-103XL
Used to measure the pulse duration.
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Photodetector
Used to detect the output pulses.
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