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Stable all-fiber passively Q-switched erbium-doped fiber laser based on plasmonic Zn doped CuGaO <sub/>2</sub> nanoplates
摘要： In this letter, we synthesized p-type Zn doped hexagonal CuGaO2 (CGZO) nanoplates (NPs) by hydrothermal reaction and utilized the nonlinear optical properties of these plasmonic NPs to realized stable passively Q-switched erbium-doped fiber laser output. We achieved tunable saturable absorbers (SAs) by changing the doping ratio of CGZO NPs. With the increase of the doping ratio, pulse duration decreases from 2.532 μs to 2.276 μs and the optical-optical conversion efficiency of the Q-switched laser increases from 1.36% to 1.70%. Our result suggests that CGZO is promising to allow tunable SAs to generate passively Q-switched fiber lasers.
关键词： Q-switched fiber laser,plasmonic Zn doped CuGaO2 nanoplates,saturable absorbers,nonlinear optical properties
更新于2025-09-11 14:15:04
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Nanoparticle and solution doping for efficient holmium fiber lasers
摘要： Efficient holmium fiber lasers have been studied as attractive laser sources operating around 2.1 μm. We report on holmium-doped silica fibers prepared by the modified chemical vapor deposition in combination with either a solution-doping method or a nanoparticle-doping method. A set of 15 fibers with various compositions was characterized and compared with respect to their fluorescence lifetime, laser slope efficiency and laser threshold. This set of fibers in wide concentration ranges allowed us to assess reliably the influence of material composition and the influence of doping method. The best-performance fibers exhibited slope efficiency 83.1%, laser threshold 155 mW and a record value of upper laser level lifetime of 1.35 ms. These results were achieved in fibers with holmium concentration lower than 800 molar ppm and Al/Ho molar ratio greater than 70. Significant differences between fibers prepared by solution doping and nanoparticle doping were not observed. The behavior of Al2O3 nanoparticles during fiber preparation is discussed in details.
关键词： infrared fibers.,Fiber laser
更新于2025-09-11 14:15:04
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Ternary chalcogenide Ta2NiS5 nanosheets for broadband pulse generation in ultrafast fiber lasers
摘要： In this article, a high-quality saturable absorber (SA) based on a two-dimensional ternary chalcogenide Ta2NiS5 nanosheet has been successfully fabricated and used in 1- and 1.5-μm spectral regions to generate ultrafast laser pulses. The Ta2NiS5-based SA is fabricated by mechanical exfoliation and sandwiched between two fiber ferrules to form a fiber-compatible SA. On the basis of the twin-detector technique, nonlinear optical absorption of the Ta2NiS5-SA is characterized by 64.7% and 11.95% modulation depths with 1.3 and 0.72 MW/cm2 saturation intensities at 1028 and 1570 nm, respectively. When Ta2NiS5-SA is integrated into Yb- and Er-doped fiber laser cavities, stable self-starting Q-switched pulses are observed. Furthermore, by adjusting the cavity structure and optimizing dispersion in the cavity, we obtain hybrid mode-locking and mode-locking fiber laser operation at 1029 and 1569 nm, respectively. These results validate the performance of Ta2NiS5 as a broadband SA for the generation of ultrafast laser pulses, offering new opportunities of ternary transition-metal dichalcogenide alloys in future photonic devices.
关键词： mode-locked,fiber laser,Q-switched
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - An Efficient 4-kW Level Random Fiber Laser Based on Tandem-Pumping Scheme
摘要： In this paper, we presented a monolithic high power random fiber laser with a tandem-pumping scheme. The random fiber laser seed centered at 1064 nm was pumped by a 1018 nm fiber laser and reached an output power of 8.66 W. After the two amplifiers, the seed was amplified to 4020 W and the 3 dB width of laser spectrum was broadened from 0.78 nm to 0.99 nm. To increase the efficiency of the 4 kW laser, a specially designed high absorption coefficient (0.6 dB/m @ 1018nm) 30/250 μm Yb doped fiber and high brightness 1018 nm pump laser were adopted. The optical-to-optical efficiency could reach as high as 88.5%. No obvious mode instability was found during the experiment. Furthermore, with the same amplifier stage, we have also built another 4 kW level fiber laser seeded by an oscillator consisting of a pair of fiber Bragg gratings. The comparison of the experimental results showed that high power laser based on RFL seed would have a better control on spectral broadening.
关键词： High power,tandem-pumping,random fiber laser
更新于2025-09-11 14:15:04
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Nickel nanoparticles‐based saturable absorber: Toward compact multiwavelength Yb‐doped fiber pulsed lasers near 1 μm region
摘要： We experimentally demonstrate a compact pulsed dual-wavelength Ytterbium-doped fiber laser (YDF) based on Nickel nanoparticles (Ni-NPs) as a Q-switcher and optical stabilizer. By integrating the Ni-NPs saturable absorber (SA) in the cavity, and adjust the 975 nm diode pump power to 185 mW, a self-starting passively Q-switched was generated at a central wavelength of 1038.5 nm. By exploiting the extra high nonlinearity of Ni-NPs, the homogenous gain broadening of the YDF oscillator can be suppressed. Consequently, at a pump power of 195 mW, a stable dual-wavelength passively Q-switching laser has been generated at room temperature without any intracavity spectral filters or modulation elements. As increases the pump power up to the maximum value of 288 mW, the Ytterbium-doped fiber laser observed that the smallest pulse width, the maximum repetition rate, and the maximum pulse energy of 1.44 μs, 100.1 kHz, and 4.45 nJ, respectively. The Ni-NPs SA proof its potential in generating multi-wavelength pulsed laser in the 1 μm region for different photonic applications.
关键词： Q-switching,fiber laser,multiwavelength,nickel nanoparticles
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Femtosecond Tm-Ho Co-Doped Fiber Laser using a CoSb <sub/>3</sub> -Skutterudite-Based Passive Mode-Locker
摘要： Pulsed lasers operating at mid-infrared (IR) are promising light sources useful for a variety of applications such as eye-safe light detection and ranging (LIDAR), gas detection, and laser surgery. Passive mode-locking technique is commonly used to obtain ultra-short pulses because it has advantages including a simple configuration, and low-cost implementation. In order to induce passive mode-locking within a fiberized cavity, the key element is a saturable absorber (SA). Until now, III-V compound semiconductors based SAs have been widely used. For the past decades, massive investigations to search for alternative SA materials such as carbon nanotubes (CNTs), graphene, topological insulator (TIs), transition metal dichalcogenides (TMDCs), have been conducted all over the world. Skutterudites have received a great amount of technical attention in the field of thermoelectrics due to low-cost, high thermoelectric quality, and long-term thermoelectric stability. The general chemical formula of the common binary skutterudites is TX3, in which T is a group transition metal and X is a pnicogen. Recently, the author’s group have investigated the saturable absorption properties of skutterudites. In this work, we experimentally demonstrate the potential of CoSb3 particles for the implementation of a saturable absorber that can operate as a passive mode-locker in the 1.9 μm wavelength region. The mode-locker was implemented by depositing a CoSb3/polyvinyl-alcohol (PVA) composite film onto the flat surface of a side-polished fiber. Using the prepared saturable absorber, it is shown that stable mode-locked pulses with a temporal width of ~838 fs at a repetition rate of ~16.93 MHz could be readily obtained from a thulium-holmium (Tm-Ho) co-doped fiber ring cavity. The center wavelength and 3-dB bandwidth were measured as 1912.9 nm and 4.62 nm, respectively.
关键词： Tm-Ho co-doped Fiber Laser,Passive Mode-locker,Femtosecond,CoSb3-skutterudite
更新于2025-09-11 14:15:04
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Parametric optimization of pulsed laser ablation on stainless steel for improving corrosion resistance by Taguchi method
摘要： In the present study, pulsed laser ablation in liquid (PLAL) treatment has been optimised for the corrosion resistance of stainless steel in neutral solution; the overlap rate is the most optimized laser parameters obtained implementing the Taguchi method has been verified experimentally and hence supporting the accuracy of optimization of laser parameters under of Variance (ANOVA) and signal to noise ratio are used to analyse the effect of different laser parameters on the responses. The laser irradiation power is the most dominant factors affecting been derived by considering the response which is corrosion potential of metal targets. Analysis out using fiber laser source by varying laser parameters include overlap rate, scanning speed, ASTM 304/2B stainless steel using Taguchi method. PLAL experimental trials were carried laser irradiation power and the number of laser pulses. The optimum laser parameters have significant impact corrosion resistance of metal in acidic solution. The responses of the the given set of experimental conditions.
关键词： corrosion behavior,PLAL,Surface modification,Taguchi method,fiber laser,stainless steel
更新于2025-09-11 14:15:04
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Investigation of the Brillouin effect in highly nonlinear hafnium bismuth erbium doped fiber
摘要： This paper demonstrates the generation of the Brillouin fiber laser (BFL) with 0.5 m long hafnium bismuth erbium doped fiber (HBEDF) as a hybrid gain medium. As the gain medium is pumped by a 980 nm laser diode at the power of 170 mW, a stable Stokes is observed at the output power of ?2.96 dBm with Brillouin pump (BP) power of 3 dBm. The laser operates at wavelength shifted by 0.09 nm from the BP. To the best of the authors’ knowledge, this is the first report of a compact BFL without employing any lengthy SMF, which features a simple cavity configuration.
关键词： hafnium bismuth erbium doped fiber,Brillouin fiber laser,stimulated Brillouin scattering
更新于2025-09-09 09:28:46
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818 W Yb-doped amplifier with??<7 GHz linewidth based on pseudo-random phase modulation in polarization-maintained all-fiber configuration
摘要： We present a polarization-maintained (PM), narrow-linewidth, ytterbium (Yb)-doped all-fiber amplifier with the result of continuous-wave 818 W, 85.2% slope efficiency, single-mode beam quality and a 13 dB polarization extinction ratio. It is based on 6.6 GHz pseudo-random binary sequence (PRBS) phase modulation (<7 GHz full width half maximum (FWHM) laser linewidth) in a simple, three-staged master oscillator power amplifier configuration. The result demonstrates the highest output power per linewidth ratio in the kW regime with a conventional PM 20/400 μm Yb-doped fiber amplifier. Further studies including the optimization of PRBS parameters and filtered PRBS phase modulation using a low-pass filter will enable <10 GHz, >kW PM high-power fiber lasers in the near future.
关键词： high-power fiber laser,pseudo-random binary sequence,polarization-maintained
更新于2025-09-09 09:28:46
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Anti-corrosion prevention of carbon steel by means of laser treatment
摘要： The article is devoted to the research of the opportunity for the increasing corrosion resistance of steel. The results of the experiments of laser processing of model samples made of carbon steel with CW ytterbium fiber laser at a wavelength of 1.06 micron. It is shown that laser processing can form resistant protective film with a thickness of 2–3 microns on the steel surface, which improve anti-corrosion properties of metal. One of the possible reasons for the increase in corrosion resistance of steel is the microstructuring of its surface to form a thin film of iron carbide (Fe3C), which is formed as a result of heating in the temperature range from 600 to 1000 °C. Besides, the exposure to laser radiation leads to reduction of surface roughness (from Ra = 0.53 μm to Ra = 0.48 μm). Optimal (from the point of view of the degree of resistance to corrosion) steel processing mode corresponds to the density level of laser radiation power density of 1.5 · 105 W cm?2, the conducted research allows to conclude that the use of CW fiber lasers is a promising method of improving the corrosion resistance of carbon steel.
关键词： fiber laser,steel treatment,anti-corrosion,laser micro structuring,metal treatment
更新于2025-09-04 15:30:14