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Widely Wavelength-tunable Mode-locked Fiber Laser Based on a 45° Tilted Fiber Grating and Polarization Maintaining Fiber
摘要： We present a passively mode-locked Erbium-doped fiber laser with tunable parameters including central wavelength, 3dB bandwidth and pulse duration. The mode-locking mechanism of the laser is realized by using single-walled carbon nanotubes polyvinyl alcohol (SWCNTs-PVA) composite film as saturable absorber. The tunable operation is implemented via a fiber birefringence filter consisting of a polarization maintaining (PM) fiber and a Brewster fiber grating. The laser achieves a maximum spectral tuning range of 36 nm with 8 cm PM fiber. The maximum spectral width variation of 5.19 nm is acquired when the PM fiber is 12 cm. Simultaneously, the spectral widths of pulses at different central wavelengths are also adjustable. Furthermore, the total cavity length is 8.28 m, which is the shortest cavity length to obtain such wide tuning range in an Erbium-doped fiber laser based on SWCNTs.
关键词： Passively mode-locked fiber laser,spectral width,wavelength-tunable,pulse width,tilted fiber grating
更新于2025-11-28 14:23:57
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Towards visible-wavelength passively mode-locked lasers in all-fibre format
摘要： Mode-locked fibre lasers (MLFLs) are fundamental building blocks of many photonic systems used in industrial, scientific and biomedical applications. To date, 1–2 μm MLFLs have been well developed; however, passively mode-locked fibre lasers in the visible region (380–760 nm) have never been reported. Here, we address this challenge by demonstrating an all-fibre visible-wavelength passively mode-locked picosecond laser at 635 nm. The 635 nm mode-locked laser with an all-fibre figure-eight cavity uses a Pr/Yb codoped ZBLAN fibre as the visible gain medium and a nonlinear amplifying loop mirror as the mode-locking element. First, we theoretically predict and analyse the formation and evolution of 635 nm mode-locked pulses in the dissipative soliton resonance (DSR) regime by solving the Ginzburg-Landau equation. Then, we experimentally demonstrate the stable generation of 635 nm DSR mode-locked pulses with a pulse duration as short as ~96 ps, a radio-frequency signal-to-noise ratio of 67 dB and a narrow spectral bandwidth of <0.1 nm. The experimental results are in excellent agreement with our numerical simulations. In addition, we also observe 635 nm noise-like pulse operation with a wide (>1 nm) and modulated optical spectrum. This work represents an important step towards miniaturized ultrafast fibre lasers in the visible spectral region.
关键词： visible-wavelength,mode-locked fibre lasers,all-fibre format,dissipative soliton resonance,passively mode-locked
更新于2025-09-23 15:19:57
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Generation and pulsating behaviors of loosely bound solitons in a passively mode-locked fiber laser
摘要： We demonstrate the experimental observation of loosely bound solitons and pulsations in a passively mode-locked ?ber laser. The soliton amount inside one soliton bunch typically increases with the increment of pump power, while the average pulse-to-pulse separation in the regime of hundreds of picoseconds decreases in principle accordingly. Besides, by employing the real-time measurement based on the dispersive Fourier-transform technique, we ?nd that some solitons in a single bunch are experiencing a simultaneous pulsating process with a period corresponding to 100 times longer than the cavity round-trip time. The experimental results can be bene?cial for better understanding the formation of multiple solitons and pulsating solitons and enriching the nonlinear phenomena in complex soliton systems.
关键词： dispersive Fourier-transform technique,pulsating solitons,loosely bound solitons,passively mode-locked ?ber laser
更新于2025-09-19 17:13:59
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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 - High power 1030 nm YB-doped picosecond all fiber laser
摘要： A high power 1030 nm passively mode-locked ytterbium-doped picosecond fiber laser by master oscillator power amplifier (MOPA) configuration is demonstrated. The laser system consists of the picosecond seed and three stages of ytterbium-doped all-fiber amplifiers. The seed is mode-locked by a semiconductor saturable absorber mirror (SESAM), and a stable output is obtained with 30.7 ps pulse width, 29.0 MHz repetition rate, and 30 mW average output power. The laser operates at 1030.4 nm with a spectral width of 0.15 nm. After three stages of fiber amplification, the final output power is scaled up to 101 W in a 30/250 μm double-clad ytterbium doped fiber with the slope efficiency of 76.7%. The laser performance with the pulse width of 36.6 ps, pulse energy of 3.48 μJ, peak power as high as 97 kW operating at 1030.4 nm with bandwidth of 1.46 nm is achieved, and the beam quality M2 is 2.78.
关键词： passively mode-locked,master oscillator power amplifier,lasers,ytterbium-doped fiber
更新于2025-09-19 17:13:59
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Generation of soliton rain in a passive mode-locked Tm-doped fiber laser at 2???μm
摘要： In this paper, the experimental investigation and theoretical analysis on the soliton rain generated in the Tm-doped ?ber laser have been carried out. On the basis of nonlinear polarization rotation technology, the fundamental and harmonic soliton rain pulses were obtained, the in?uence of net negative dispersion cavity length on the output performances of soliton rain pulse were studied, and the spectral sideband characteristics of soliton rain were numerically analyzed. By comparing the spectra of continuous wave mode-locking and soliton rain states, it can be found that the quasi-periodic modulation exists for the spectral sideband of soliton rain resulted from the complex interaction between the dispersive wave and the soliton wave. The interaction is one of the major factors for the formation of soliton rain. The research results are helpful for the better understanding of the soliton rain dynamics and mechanism in passive mode-locked ?ber lasers.
关键词： Fiber laser,Passively mode-locked,Soliton rain,Tm-doped
更新于2025-09-19 17:13:59
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Mechanism of formation of noiselike pulses in passively mode-locked fiber lasers
摘要： We present the results of an analysis of noiselike pulses generated in passively mode-locked ?ber lasers with anomalous dispersion. The master equation used for the analysis takes into account the gain saturation, the quadratic frequency dispersion of the gain and the refractive index, and the cubic-quintic nonlinearity of the losses and refractive index. Reasons for the stabilization of noiselike pulses are investigated. It is found that the space-time localization of a noiselike pulse is associated with the suppression of single solitons located outside this pulse. The mechanism of such competition between single solitons and a noiselike pulse is determined.
关键词： noiselike pulses,passively mode-locked ?ber lasers,solitons,anomalous dispersion,nonlinear optics
更新于2025-09-12 10:27:22
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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) - Passively Mode-Locked Quantum-Well Semiconductor Laser Subject to Ultra-Short Optical Self-Feedback with Nanometric Fine-Delay
摘要： Monolithic passively mode-locked (PML) semiconductor lasers emitting at 1070 nm are promising ultra-fast sources for new prospective photonic transport systems in a 1 μm transmission window waveband [1,2]. As residual optical feedback (OFB) can deteriorate the emitted optical pulse trains, experimental studies exploring the immunity of the laser against perturbations by unintentional OFB with nanometric precision are demanded, but however yet lacking. We study experimentally the impact of sub-wavelength scale fine-delay controlled short-cavity OFB on the optical spectra, repetition rate (RR) and average optical output power of a monolithic PML semiconductor quantum-well (QW) laser. The laser emits picosecond short optical pulses at 1070 nm with a free-running RR of 13.6 GHz corresponding to an internal pulse round-trip time of 75 ps. A similar device has been investigated in [2]. OFB is provided by a free-space external cavity exhibiting a macroscopic delay length Tmac ranging from 145 ps up to 275 ps round-trip time. A wedged glass on a high-precision linear translation stage provides delay with nanometric precision. We first study the optical pulsed emission in dependence of changing Tmac from 145 ps to 275 ps. The color-coded measured nonlinear auto-correlation (AC) signals and RRs are depicted in Fig. 1(a) and Fig. 1(b), respectively.
关键词： passively mode-locked,ultra-short optical self-feedback,quantum-well semiconductor laser,nanometric fine-delay
更新于2025-09-11 14:15:04