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Ultrafast mode-locked dual-wavelength thulium-doped fiber laser using a Mach-Zehnder interferometric filter
摘要： A simple and robust method to generate a dual-wavelength mode-locked laser using a tunable Mach-Zehnder filter (TMZF) and a single-wall carbon nanotube (SWCNT) based saturable absorber (SA) is proposed and demonstrated. The proposed laser uses a thulium-doped fiber for lasing in the two-micron region and exploits the interferometric spectrum of the TMZF to produce dual peaks with nearly equal magnitude. SWCNT based SA enables mode-locking at a threshold value of 150.4 mW with distinct dual-wavelength peaks at 1919.2 nm and 1963.7 nm. The peaks have a calculated pulse width of 1.8 ps and 1.6 ps, respectively with a repetition rate of 9.1 MHz with a relatively high optical-signal-to-noise ratio value of 59.1 dB. The output is also observed to remain unchanged over time, indicating high stability. The proposed laser has a promising application, particularly in ultrafast gas molecular spectroscopy and sensing.
关键词： Thulium-doped fiber laser,Mode-locking,Dual-wavelength,Mach-Zehnder filter
更新于2025-11-28 14:24:03
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Mode-locked thulium doped fiber laser with zinc oxide saturable absorber for 2?μm operation
摘要： In this work, a 2.0-micron mode-locked thulium doped fiber laser is demonstrated using zinc oxide (ZnO) as the saturable absorber (SA) in a thulium doped fiber laser (TDFL). The ZnO nanorods was prepared by the facile hydrothermal method, and then embedded in polyethylene oxide composite film to form the SA. The laser is capable of generating soliton pulses at a central wavelength of 1945.45 nm with a 3-dB bandwidth of 3.47 nm. The pulse width is measured to be 1.395 ps, only slightly higher than the calculated transform-limited pulse width of 1.15 ps. The peak power of the generated mode-locked pulses is then calculated to be as high as 41.88 W, with a signal-to-noise ratio of 50.5 dB. The fabricated ZnO film in this work would allow the generation of mode-locked pulses, which could be useful for applications in spectroscopy and medicine due to the eye-safe and highly sensitive nature of the 2.0-micron region.
关键词： pulse fiber laser,mode-locking,Thulium,zinc oxide
更新于2025-11-28 14:24:03
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Rectangular Pulse Generation from a Mode Locked Raman Fiber Laser
摘要： Rectangular and step-like pulses are generated in a mode locked Raman fiber laser with a nonlinear optical loop mirror. The Raman laser has a typical figure-8 configuration. Stable rectangular pulses with a fundamental repetition rate of 733 kHz are obtained. As the increasing of the pump power, the Raman pulse evolves to a step-like rectangular pulse. The maximum pulse energy is 64.1 nJ with a pulse width of 25.1 ns. After spectrally resolved measurements, the step-like pulse is proved to be induced by the dual wavelength oscillation. It is the first report of rectangular pulsed output in mode-locked Raman fiber laser to the best of our knowledge.
关键词： Laser mode locking,Raman scattering,Fiber lasers
更新于2025-11-28 14:24:03
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L-band tunable and dual-wavelength mode locked fiber laser with NCF-GIMF based SA
摘要： A hybrid structure of no-core fiber and graded-index multimode fiber (NCF-GIMF) is demonstrated, which can be used as both the saturable absorber (SA) and the wavelength selective element. By employing such a device, an L-band wavelength tunable Er-doped mode-locked laser is realized and stable single solitons of ~1.7ps, with continuously tunable wavelengths from 1574 nm to 1601.1 nm, are generated. Moreover, dual-wavelength mode-locked laser operation at 1575.4 nm and 1603 nm is achieved, with pulse duration of 1.2 ps and 1.7 ps, respectively. The proposed device is simple and compact, and represents an effective approach for tunable and dual-wavelength mode-locked fiber laser operation.
关键词： Laser tuning,Optical fiber devices,Laser mode locking,Fiber-graded index multimode fiber,Fiber nonlinear optics
更新于2025-11-28 14:23:57
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Two-micron all-fiberized passively mode-locked fiber lasers with high-energy nanosecond pulse
摘要： We report on mode-locked thulium-doped ?ber lasers with high-energy nanosecond pulses, relying on the transmission in a semiconductor saturable absorber (SESA) and a carbon nanotube (CNTs-PVA) ?lm separately. A section of an SMF–MMF–SMF structure multimode interferometer with a transmission peak wavelength of ～2003 nm was used as a wavelength selector to ?x the laser wavelength. When the SESA acted as a saturable absorber (SA), the mode-locked ?ber laser had a maximum output power of ～461 mW with a pulse energy of ～0.14 μJ and a pulse duration of ～9.14 ns. In a CNT-?lm-based mode-locked ?ber laser, stable mode-locked pulses with the maximum output power of ～46 mW, pulse energy of ～26.8 nJ and pulse duration of ～9.3 ns were obtained. To the best of our knowledge, our experiments demonstrated the ?rst 2 μm region ‘real’ SA-based dissipative soliton resonance with the highest mode-locked pulse energy from a ‘real’ SA-based all-?berized resonator.
关键词： high pulse energy,nanosecond pulse,Tm-doped ?ber laser,mode-locking
更新于2025-09-23 15:21:01
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Observation the Multi-Soliton Patterns From the Er-Doped Mode-Locked Fiber Laser Modulated by PtSe2
摘要： The passively mode-locked ?ber laser modulated by low-dimensional materials can provide an ideal platform to investigate the soliton dynamics. Here, we experimentally explored the soliton formation and evolution from an erbium-doped ?ber laser mode-locked by mechanically exfoliated PtSe2 saturable absorber via evanescent ?eld interaction. With the increasing pump power, different soliton patterns, such as single soliton, two solitons, and bound soliton, can be observed experimentally. The experimental results can identify the non-linear optical response of the PtSe2 and may make avenue toward unveiling the nature of the soliton dynamics in the ?ber laser system.
关键词： non-linear optics,soliton dynamics,?ber laser,mode-locking,saturable absorber
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Barranquilla, Colombia (2019.6.5-2019.6.7)] 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Ultrashort Pulse Generation in EDFL Cavities using Graphene as Saturable Absorber for applications in optical communications systems
摘要： Graphene and 2D materials are being used in the design of light sources due to their wide absorption spectrum, ultrafast recovery time and high modulation depth. In this work, we present a experimental design of an modelocking Erbium-Doped-Fiber-Laser (EDFL) that uses graphene deposited onto D-shaped optical fiber, acting as a saturable absorber, in order to generate ultra-short pulses in an important region for optical communications: 1558.5 nm. To best of our knowledge, this is the first ultrashort pulses laser designed an experimentally validated in Colombia. The results shows a pulsed laser with a repetition rate of 33.3 MHz and a spectral width of 10 nm.
关键词： Saturable absorber,Graphene,Erbium-doped-fiber-laser,Mode-locking,D-shaped Optical fiber,Ultrashort pulses
更新于2025-09-16 10:30:52
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Mode-locking and self-mode-locking-like operation in a resonantly pumped gain-switched Tm-doped fiber laser
摘要： Mode-locking and mode-locking-like operation in a fast gain-switched Tm-doped fiber laser have been investigated experimentally. Applying a SESAM mirror, stable gain-switched and regular mode-locked pulses at a wavelength of ～2μm are reported. The repetition rates of the gain-switched pulses and mode-locked sub-pulses are 50 kHz and 111 MHz, respectively. The duration of sub-pulses recorded within one gain-switched pulse envelope is ～110 ps. Besides, in the same laser system configuration, it has been found that self-starting mode-locked resembling pulses, attributed to mode beating, can be generated. To the best of our knowledge, it is the first report on a gain-switched fiber laser where both modes of operation have been demonstrated.
关键词： Fiber laser,Mode-locking,Thulium-doped fiber,Gain-switching
更新于2025-09-16 10:30:52
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CFBG Based Bidirectional Mode-locked Fiber Laser Emitting Conventional and Dissipative Solitons
摘要： We report on the multi-state soliton generation in a chirped fiber Bragg grating (CFBG) based bidirectional mode-locked fiber laser. In particular, a θ-shape associate cavity is designed to introduce reverse dispersion distributions in counter-propagation directions through the bidirectional reflection of the CFBG into the lasing oscillator. With a relatively compact cavity configuration, the clockwise (CW) and counterclockwise (CCW) directions are managed into large anomalous and normal dispersion regimes, respectively. Consequently, conventional solitons (CSs) and dissipative solitons (DSs) can be emitted from the counter-propagation directions. To the best of our knowledge, it is the first report of CS/DS generation in a CFBG based bidirectional fiber laser. This investigation can contribute to research community of multiplexed ultrafast fiber lasers.
关键词： Fiber lasers,ultrafast optics,bidirectional cavity,fiber grating,laser mode locking
更新于2025-09-16 10:30:52
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Self-starting all-fiber mode-locked laser based on Mamyshev mechanism with high-energy pulse generation at 1550 nm
摘要： An all-fiber mode-locked laser based on Mamyshev mechanism operating at 1550 nm was demonstrated. Self-phase modulation and offset spectral filtering provide high peak-power pulse selection in the laser cavity and induce mode locking. With selected operating parameters, the all-fiber mode-locked laser easily achieves mode locking without external seed pulses or auxiliary starting arms, making the laser convenient to operate. Pulses with maximum energy ~18 nJ and width 230 fs are obtained. Pulse width is almost unchanged with increasing pump power, while pulse energy increases linearly. Starting of the mode-locked laser based on Mamyshev mechanism and output spectra with different pump powers were experimentally investigated.
关键词： Fiber nonlinear optics,Fiber lasers,Laser mode locking,Laser cavity resonators
更新于2025-09-12 10:27:22