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- 2019
- 2018
- supercontinuum generation
- Nonlinear
- photonic crystal fiber taper
- liquid filled photonic crystal fiber
- fiber optic sensor
- temperature sensor photonic crystal fiber
- Electrospinning
- fiber rod
- quantum dot-converted LEDs component
- Scattering
- Optoelectronic Information Science and Engineering
- Beijing University of Posts and Telecommunications (BUPT)
- Dalhousie University
- Soochow University
- Technical University of Ostrava
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A fast interrogation system of FBG sensors based on low loss jammed-array wideband sawtooth filter
摘要： In this paper, a low loss jammed-array wideband sawtooth (JAWS) filter is built based on a finite reflection virtually imaged array (FRVIA) which has a lower reflectivity of the exit surface compared to a virtually imaged phased array (VIPA). This filter can be used as an edge filter to interrogate the fiber Bragg grating (FBG) sensors. A fast FBG sensing system is set up to detect the strain wave of iron pipe to demonstrate the use of this interrogator. The result shows that the JAWS based interrogation system has advantages of high speed, low loss and high sensitivity.
关键词： JAWS filter,Fiber Bragg grating (FBG) interrogator,Finite reflection virtually imaged array
更新于2025-11-28 14:24:03
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Passively Q-switched fiber laser tunable by Sagnac interferometer operation
摘要： In this paper, a stable passively Q-switched Erbium-doped fiber laser (EDFL) tunable by Sagnac interferometer operation was described by using a graphene oxide saturable absorber (SA) as a Q-switcher. The wavelength operation of the Q-switched EDFL was tunable from 1566.3 nm to 1559.3 nm by increasing the temperature of sagnac loop mirror (SLM) from 30 °C to 70 °C in the figure-of-eight laser configuration. At 1566.3 nm operation, by increasing the pump from the threshold power of 77.3 mW to 126.5 mW, the repetition rate can be increased from 30.7 kHz to 41.5 kHz while the pulse width was narrowed from 10.2 to 7.3 μs. The Q-switching threshold pump power increased with the increase of the temperature, which then shifted the operation to a shorter wavelength. However, the laser efficiency increased at a shorter wavelength operation. At 1561.4 nm operation, the maximum pulse energy of 20.5 nJ was obtained at 161.0 mW pump power.
关键词： Q-switching operation,Fiber lasers,Sagnac loop mirror,Temperature tuning
更新于2025-11-28 14:24:03
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Dissipative soliton resonance in a passively mode-locked praseodymium fiber laser
摘要： Dissipative soliton resonance (DSR) operation in a passively mode-locked praseodymium-doped fluoride fiber laser with a nonlinear optical loop mirror is proposed and demonstrated. A praseodymium-doped fluoride fiber is employed as the gain medium to allow lasing in the 1.3 μm region, and a stable square pulse emission at 1303 nm is observed. The width of the square pulse broadens with the increment of pump power, from 83 ns to 239 ns, whereas the peak power remains at a comparable level. The highest single pulse energy is recorded at around 2.3 nJ without the appearance of pulse breaking, validating the predicted DSR operation. To the best of author’s knowledge, this work is the first study of DSR operation in the 1.3 μm region.
关键词： Mode-locked,Dissipative soliton resonance,Fiber laser,Praseodymium
更新于2025-11-28 14:24:03
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GaSe saturable absorber for mode-locked Er-doped fiber laser
摘要： A GaSe-PVA based saturable absorber (SA) is prepared by liquid-phase stripping method. The linear and nonlinear transmission spectrum, AFM, SEM and Raman spectrum are used to characterize the SA, the modulation depth of 6.4% and the saturation intensity of 72 MW/cm2 indicated that the GaSe nanosheets can be employed as SA for mode-locked (ML) operation in Er-doped fiber laser (EDFL). The passively mode-locked operation with the output power of 29.1 mW, pulse width of 4.3 ps and repetition rate of 8.849 MHz can be obtained by GaSe-PVA based SA.
关键词： mode-locked,Er-doped fiber laser,GaSe saturable absorber
更新于2025-11-28 14:24:03
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High-energy dissipative soliton resonance and rectangular noise-like pulse in a figure-9 Tm fiber laser
摘要： We experimentally demonstrate a direct generation of high-energy dissipative soliton resonance (DSR) and rectangular noise-like pulse (NLP) in a figure-9 thulium-holmium-doped mode-locked fiber laser. The pulse duration and average output power of the DSR can be tuned from 33.5 ns to 144.6 ns, and from 100.25 mW to 677.5 mW, respectively. The maximum of pulse energy is 713.2 nJ without wave breaking at pump power of 6.7 W, which is the highest energy of DSR in the region of 2 μm, to the best of our knowledge. In addition, the rectangular NLP with 452 nJ pulse bunch energy is also obtained.
关键词： dissipative soliton resonance,noise-like pulse,high-energy pulses,thulium-holmium-doped fiber laser
更新于2025-11-28 14:24:03
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High-power dissipative soliton resonance fiber laser with compact linear-cavity configuration
摘要： An ultra-compact mode-locked Yb-doped fiber laser under the operation regime of dissipative soliton resonance (DSR) has been demonstrated, which exports sub-nanoscond pulses with a maximum output average power of 2.4 W. The linear-cavity configuration of the proposed fiber laser is formed by a highly reflective fiber Bragg grating at 1066 nm and a nonlinear optical loop mirror (NOLM) consisting of a 5/95 optical coupler. As a result, DSR pulses with maximum average power of 2.4 W and repetition rate of 10.119 MHz have been obtained, when pump power is 10 W. The compact DSR Yb-doped fiber laser with high output power have great potential applications in material processing, optical communications, and so on.
关键词： dissipative soliton resonance,Yb-doped fiber laser.,mode-locked
更新于2025-11-28 14:24:03
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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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Switchable and dual-wavelength self-Q-switched fiber laser based on a homemade Er/Yb double clad fiber and polarization maintaining fiber Bragg grating
摘要： We report an experimental study on the self-Q-switched operation of a linear cavity fiber laser based on a homemade Er/Yb double clad fiber as gain medium. The parameters of the self-Q-switched pulses depend on the active fiber length of 2, 3, and 4 m. With a maximum fiber length of 4 m, stable self-Q-switched pulses are obtained for the whole 976 nm pump range, with a minimum pulse duration of 1.24 μs and a maximum repetition rate of 92.57 kHz. When the fiber length is shortened to 2 m, the range of the pump power level, at which the self-Q-switched operation is attained, is significantly diminished. Besides, dual-wavelength and switchable single-wavelength laser operations of the fiber laser are achieved by using a polarization maintaining fiber Bragg grating as spectral filter. Laser wavelengths at 1536.7 and 1537.1 nm with a line-width of 0.4 nm are obtained. The maximum average output power for the Q-switched laser operating in the dual-wavelength regime is 472 mW.
关键词： self-Q-switching,fibre lasers,Er/Yb double-clad fiber lasers
更新于2025-11-28 14:24:03
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Passively Q-switched and mode-locked Tm-Ho co-doped fiber laser using a WS2 saturable absorber fabricated by chemical vapor deposition
摘要： We demonstrate a passively Q-switched and mode-locked Tm-Ho co-doped fiber laser based on a WS2 saturable absorber (SA) fabricated by chemical vapor deposition method. When the pump power increases from 0.32 W to 0.38 W, the repetition rate of the Q-switched laser pulse increases 47.1 kHz to 90.1 kHz and the pulse width decreases from 6.2 μs to 1.7 μs. In addition, the mode-locking operation can also be observed by adjusting the polarization controller (PC) and mode-locked laser pulses at 1883.2 nm can be achieved at a high pump power between 0.5 W and 0.64 W. The pulse duration is 1.07 ns and repetition rate is 23.8 MHz and the pulse is the longest mode-locked pulse with WS2-SA ever reported.
关键词： Mode-locked lasers,Optical fiber lasers,Ultrafast optics
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