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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Soliton Self-Frequency Shift in Mode Locked Fiber Lasers
摘要： We propose and demonstrate the soliton evolution in a mode locked Er-doped fiber laser with intra-cavity soliton self-frequency shift by numerical simulation, and analyze effects of different parameters including of pump strength, length of dispersion shift fiber (DSF), and modulation depth of saturable absorber in detail for the first time. The results show that once the stable output pulse is formed, the frequency shift amount would increase with increasing the pump strength or decreasing the length of DSF and the modulation depth.
关键词： fiber lasers,red shift,Soliton self-frequency shift,mode locked pulse
更新于2025-09-16 10:30:52
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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) - Sub-20 fs ? 10.5 W Visible Pulse Generation from Yb-Doped Fiber Laser
摘要： High-power high-repetition rate femtosecond ytterbium-doped fiber lasers offer new perspectives in femtochemistry, solid-state physics and strong field physics. In particular, high-order harmonic generation (HHG) driven by Yb-fiber laser has demonstrated high photons flux in extreme ultraviolet (XUV) spectral range [1,2]. Shortening the laser pulse improves the achievable time resolution in pump-probe experiments and also the efficiency and the spectral extent of HHG (cutoff wavelength). However, the gain bandwidth of the Yb:fiber limits the pulse duration in the 250 fs - 130 fs range. To solve this issue, nonlinear pulse compression experiments using Yb:fiber lasers have been carried out at the fundamental wavelength (1030 nm) to downscale the pulse duration in the 10 fs range [3,4]. On the other hand, so far the highest reported XUV photons flux up to milliwatt-class has been obtained at 515 nm driving wavelength with 11W - 85 fs pulses [5]. While frequency doubling an ultrashort (< 30 fs) pulse requires a trade-off between efficiency and pulse duration lengthening, we present in this work an efficient and high power sub-20 fs visible laser source based on the second harmonic generation (SHG) of a high energy Yb-doped femtosecond fiber laser followed by a nonlinear compression stage in a krypton-filled capillary.
关键词： femtosecond ytterbium-doped fiber lasers,nonlinear pulse compression,krypton-filled capillary,second harmonic generation,high-order harmonic generation
更新于2025-09-16 10:30:52
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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) - Buildup of Noise-Like Pulses in Ultrafast Fiber Lasers
摘要： Noise-like pulses (NLP) - the emission of sub-nanosecond incoherent pulses in ultrafast lasers - are a topic of widespread attention, owing to their fundamental and applied interest [1]. Their existence seems paradoxical, combining the high temporal localization of circulating pulses akin to mode-locking, with a fundamental instability that entails large fluctuations [2]. NLPs can be considered as incoherent dissipative solitons [3]. It is therefore of considerable interest to investigate the self-emergence of these pulses in the laser. We undertake this study experimentally using the time-stretch dispersive Fourier transform (DFT), recording the pulse spectral and temporal information in real time over successive cavity roundtrips [4]. The buildup dynamics of noise-like pulses in both anomalous and normal-dispersion fiber lasers are compared, revealing markedly different stages and timescales in the evolution process.
关键词： anomalous dispersion,normal dispersion,Noise-like pulses,ultrafast fiber lasers,dispersive Fourier transform
更新于2025-09-16 10:30:52
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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) - Optimization of the Efficient Single Pass Two-Stage DFG of Er and Yb Fiber Lasers Radiation into Mid-Infrared Region
摘要： High power laser radiation sources with wavelengths near 3 μm are indispensable for processing of organic and high water-containing materials. These wavelengths belong to mid-infrared (mid-IR) range, which is also called molecular footprint region. Where the absorption peaks of water and hydrogen bonds are located, that provides many opportunities for the application in biology, medicine and non-metal material processing [1]. Direct generation of mid-IR radiation associated with a number of difficulties. The main one among them is the limited choice of the active gain media with a transparency window in this range. The other way to obtain these wavelengths is a nonlinear parametric conversion. In particular, difference frequency generation (DFG) in periodically poled niobate or tantalate lithium (PPLN or PPLT) crystals [2]. Relatively high nonlinearity, transparency in the desirable spectral region, photorefractive damage resistance with MgO doping and possibility of using the quasi-phase-matching (QPM) technique by periodic poling allows them to pretend on a leading role for developing mid-IR radiation sources. The single pass OPO process for 1 μm radiation without seed provides a low pump to idler conversion efficiency. Even with seed presence it fundamentally limited about 30% by photons energy relations. We improve DFG efficiency of Yb pump (1.03 μm) and Er seed (1.5 μm) fiber lasers to mid-IR by adding the second stage [3]. After the first stage, the parametrically amplified seed used as a pump, and mid-IR idle became a new seed for the second conversion process. This approach allowed us experimentally reach overall 20 W mid-IR radiation power with a more than 50% pump conversion efficiency at 3.05 μm and 3.19 μm wavelengths.
关键词： mid-infrared,fiber lasers,DFG,QPM,PPLT,PPLN
更新于2025-09-16 10:30:52
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Passively Q-switched pulsed fiber laser with higher-order modes
摘要： We experimentally demonstrate a passively Q-switched fiber laser that generates higher-order modes pulse beam based on HfSe2 saturable absorber and spatial light modulator. Due to the large modulation depth of the HfSe2 film, a Q-switched pulse with wide repetition rate can be realized based on the saturable absorption effects. Further investigation shows various higher-order Laguerre-Gaussian modes can be achieved by launching the Q-switched fundamental mode pulse onto spatial light modulator. Our studies provide a simple way to obtain a stable Q-switched fiber laser with higher-order modes pulse beam.
关键词： fiber lasers,HfSe2 saturable absorber,higher-order Laguerre-Gaussian modes,Q-switched
更新于2025-09-16 10:30:52
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[Laser Institute of America ICALEO? 2014: 33rd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing - San Diego, California, USA (October 19–23, 2014)] International Congress on Applications of Lasers & Electro-Optics - ITO patterning using advanced green and infrared pulsed fiber lasers
摘要： Laser patterning of Indium Tin Oxide (ITO) deposited on bulk substrates enables a chemical waste free, high throughput process that is widely used in flat panel and touch panel display devices. To attain economic viability and meet the need for narrow touch sensor borders with high quality ITO patterning, the width, uniformity, and throughput of the scribing lines are key quality parameters. In this talk we report on the advances in pulsed nanosecond fiber lasers at wavelengths of 532 and 1064-nm with optimized parameters for meeting theses critical requirements. Specifically, near diffraction-limited beam quality, high peak power capabilities, short pulses, and fast transient response are necessary to produce consistent scribed lines in the order of 10?m in width with smooth edges. The results of our study demonstrate the advantage of using the IR laser as a robust, cost-effective solution for scribing lines with a width in between 15-25?m. However, the ability to focus the beam of the green laser more tightly makes it the preferred candidate for meeting the 10?m width target.
关键词： 1064nm,PRF,532nm,nanosecond,ITO patterning,peak power,pulse duration,fiber lasers,beam quality
更新于2025-09-16 10:30:52
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A survey of fiber laser technology in light of laser particle accelerator
摘要： Fiber laser technology and related performance and maturity are surveyed with the perspectives of laser acceleration. Advantageous fiber attributes allow high efficiencies in energy-conversion and heat removal and superior performance in high repetition. Wide utilization in the industries has led to high reliability and cost effectiveness in fiber laser technology. With coherent combination of fiber amplifiers, average-power and peak-power levels are targeted for practical laser-driven plasma acceleration applications.
关键词： coherent combination,Fiber lasers,laser acceleration
更新于2025-09-16 10:30:52
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Q-switched erbium-doped fiber laser using silver nanoparticles deposited onto side-polished D-shaped fiber by electron beam deposition method
摘要： A stable Q-switched erbium-doped fiber laser (EDFL) is demonstrated using silver nanoparticles (AgNPs) as a passive saturable absorber. A prefabricated D-shaped silica fiber is coated with AgNPs using electron beam deposition method. Four different sizes of D-shaped fiber, which were controlled by observing the loss during the polishing process are used in this study. All four samples with losses of 1.2 dB, 2 dB, 3 dB and 3.5 dB were able to produce Q-switched pulse in 1.5-μm region, with an ability to lase at a threshold of 35.2 mW. Maximum repetition rate was recorded at 66.74 kHz for the D-shaped fiber configured with 3 dB loss, while the narrowest pulse width was obtained at 6.17 μs for 2 dB loss. All samples were also producing pulses at the maximum applicable pump power of 65.7 mW, and output power recorded at that power level are between 5.86 mW and 7.36 mW.
关键词： Laser resonator,Fiber lasers,Passive Q-switching
更新于2025-09-16 10:30:52
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Yttrium oxide as a Q-switcher for the near-infrared erbium-doped fiber laser
摘要： Yttrium oxide (Y2O3) has been widely used in metal-reinforced composites, microelectronics, waveguide lasers, and high-temperature protective coatings because of its good physical and photoelectric properties. However, few studies have been done on the nonlinear optical applications of Y2O3 as saturable absorbers (SAs) in fiber lasers so far. Here, a passively Q-switched near-infrared fiber laser using Y2O3 as a Q-switching device is demonstrated. The optical nonlinear properties of the Y2O3 SA prepared by the magnetron sputtering method were measured by the twin-detector measurement technique, and the modulation depth of the proposed Y2O3 SA was found to be 46.43%. The achieved Q-switched laser delivers an average output power of 26 mW at 1530 nm with a pulse duration of 592.7 ns. To the best of our knowledge, this is the first report on the optical nonlinearity of Y2O3 as a Q-switcher for the near-infrared fiber laser, which may deepen the understanding of the optical nonlinear properties of Y2O3 and make inroads into the potential market of optical modulation and optoelectronic devices.
关键词： Q-switched laser,saturable,fiber lasers,absorbers,nonlinear optical materials
更新于2025-09-16 10:30:52
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35 fs, all-polarization-maintaining MOPA laser system
摘要： We have experimentally observed ultrashort pulse in a simple, all-polarization-maintaining fiber, master oscillator and power amplifier laser. A semiconductor saturable mirror (SESAM) module is used as the mode locker. The ultrashort pulse exhibits perfect Gaussian spectrum without any fine structure. The 20 dB pulse spectral width is 28 nm, and the pulse duration directly output from the oscillator is 268.6 fs. Via a two-stage amplifier, the pulse spectrum is greatly broadened to 43 nm, and the pulse duration lengths to 0.9 ps. Moreover, after compression, a typical saddle-shaped spectrum appears and the spectral bandwidth broadens to 121 nm; the pulse duration is compressed to ~35 fs with a pulse peak power of 22.79 kW, which is high enough to stimulate a one-octave supercontinuum spectrum. Due to the polarization-maintaining structure and high reliability of SESAM, the whole system exhibits strong environmental stability. Experimental observation reveals that such a fiber laser with a very simple structure exhibits excellent performance, and could be applied in the area of optical frequency comb.
关键词： ultrafast fiber lasers,pulse propagation and temporal solitons,pulse compression
更新于2025-09-16 10:30:52