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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) - High-Power Dual-Comb Thin-Disk Oscillator
摘要： Dual-comb spectroscopy is a rapidly advancing spectrometric technique where the temporal interferograms generated with two asynchronous trains of pulses are recorded, and Fourier transformed to reveal the spectrum of an absorber in the beam path [1]. To date, best performance is achieved with systems involving complex active stabilization of two femtosecond erbium fiber lasers [1]. One way to simplify the technique is to generate a dual-comb output from a single laser cavity. However, there have been only a few demonstrations of such a scheme so far [2,3]. Here we present a dual-comb system based on a single thin-disk oscillator. The novel architecture effectively rejects common noise, with mutual coherence time exceeding one second without any active stabilization. Moreover, the system shows nearly an order of magnitude higher average and peak output powers compared to previous dual-comb demonstrations. Efficient nonlinear frequency conversion to the UV or mid-IR regions—of high interest to molecular spectroscopy—will thus be greatly facilitated.
关键词： thin-disk oscillator,high-power,Yb:YAG,Kerr-lens mode-locked,dual-comb spectroscopy
更新于2025-09-11 14:15:04
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Single- and dual-wavelength switchable mode-locked dissipative soliton Yb-doped fiber laser based on graphene/WS <sub/>2</sub> nanocomposites modelocker and polarization controller
摘要： We report a single- and dual-wavelength switchable mode-locked dissipative soliton in an ytterbium-doped fiber laser based on graphene/WS2 nanocomposites saturable absorber. The graphene/WS2 nanocomposites film possesses efficient saturable absorption characteristics with large modulation depth (45.1%), which results in the stable single-wavelength mode-locking operation with pulse duration of 450 ps. By carefully rotating the polarization controller, the mode-locking operation can be switched to a dual-wavelength at both 1066.4 nm and 1069.2 nm due to the modulation of the intracavity birefringence. Our work extends the studies for 2D nanomaterials and supplies potential applications in the multi-wavelength fiber laser.
关键词： mode-locked fiber laser,saturable absorber,dual-wavelength,graphene/WS2 nanocomposites,dissipative soliton
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) - Growth, Spectroscopy and Laser Operation of Tm,Ho:CNGG: A Promising Disordered Crystal for Mode-Locked Lasers
摘要： Mode-locked (ML) lasers emitting in the spectral range of ~2 μm are based on Thulium (Tm3+) or Holmium (Ho3+) ions. The former one typically emits slightly below 2 μm where the atmosphere water vapour absorption can constrain the emission bandwidth of a ML laser. A disordered host material can provide inhomogeneous broadening of the emission spectra beyond 2 μm: recently, a Tm3+-doped disordered CNGG-type garnet generated 78 fs pulses at 2017 nm [1]. Another route is the use of Tm3+,Ho3+ codoped materials for further spectral broadening. Here, we report on the growth, structure, spectroscopic characterization, and free-running and wavelength-tunable laser operation of a Tm,Ho:CNGG disordered garnet crystal with high potential for sub-100 fs ML lasers. The crystal was grown by the Czochralski method, doped with 2.64 at.% Tm and 0.55 at.% Ho as determined by ICP-MS. The crystal structure was studied by XRD, Fig. 1(a), and Raman spectroscopy. The crystal showed a broadband emission at ~2 μm and the “effective” gain cross-section spectra were smooth and broad, Fig. 1(b). The maximum σSE for Ho3+ is 0.47×10-20 cm2 at 2080 nm. The parameters of the Tm3+→Ho3+ energy-transfer (ET) were determined as P28 (Tm → Ho) = 5.92 and P71 (Ho→Tm) = 0.68 [10-23 cm3/μs] (κET = P71/P28 = 0.115). CW (free-running) laser operation was achieved under diode-pumping at 802 nm, Fig. 2(a,b). The Tm,Ho:CNGG laser with a compact plano-plano cavity generated a maximum output power of 413 mW at 2088.3 nm with a slope efficiency η of 15.9% (vs. the absorbed pump power) and the laser threshold was at 0.36 W (for a 1.5% transmission output coupler). By placing a 6.0 mm-thick AR-coated Tm,Ho:CNGG crystal in an X-shaped cavity with Ti:Sapphire laser pumping, Fig. 2(c), wavelength-tuning of the laser emission was studied with a Lyot filter. For a 0.5% transmission output coupler, the laser wavelength was continuously tuned from 1932.5 to 2142.1 nm (a tuning range of 209.6 nm). These results indicate the suitability of Tm,Ho:CNGG disordered garnet for sub-100 fs ML and broadly tunable lasers at ~2 μm.
关键词： disordered garnet,Tm,laser operation,Ho:CNGG,spectroscopy,mode-locked lasers
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) - Dual-Wavelength Dual-Comb Mode Locked Er-Doped Fiber Laser Based on Saganc Fiber Loop Mirror
摘要： We report an all-fiber dual-wavelength dual-comb mode locked fiber laser based on a Sagnac fiber loop mirror. Two asynchronous mode locked pulse trains with repetition rate difference of 218 Hz was realized.
关键词： fiber laser,Sagnac fiber loop mirror,mode locked,dual-wavelength,dual-comb
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) - Passively Mode-Locked High-Repetition Rate Er:YLF Laser at 2.81 μm Generating 72 ps Pulses
摘要： The erbium-doped active media allow to generate laser radiation in spectral range 2.7-2.94 μm if the laser transition 4I11/2→4I13/2 is used. Since the laser radiation in this spectral range is strongly absorbed in the water these lasers can be used in medicine (surgery, ophthalmology, urology). Nowadays, there are many papers deal with erbium-doped bulk active media operating in free-running or Q-switched regime, nevertheless, the passively mode-locked lasers are mainly built with Er-doped fibres. However, the compact passively mode-locked erbium-doped bulk lasers could offer a higher repetition rate and smaller dimensions. To date, the shortest laser pulses (1.78 ns) generated with erbium bulk laser (Er:CaF2-SrF2) was obtained in Q-switched mode-locked regime. In this paper, the SESAM mode-locked compact Er:YLF laser with the picosecond pulses and GHz repetition rate for the first time, according to the author’s knowledge, is presented.
关键词： mode-locked,GHz repetition rate,picosecond pulses,laser,erbium-doped
更新于2025-09-11 14:15:04
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Super Gaussian pulse generation in a passively mode-locked fiber laser
摘要： The generation of self-similar super Gaussian-like pulses from a passively mode-locked fiber laser is numerically demonstrated. The laser cavity utilizes a long period fiber grating as a pulse-shaping element. The model is based on the normalized complex Ginzburg-Landau equation and the nonlinear coupled mode equations of the grating. The numerical results show stable super Gaussian pulses with a linear frequency chirp, a 1.5 ps pulse duration and 2 nJ energy. The generated pulses are scalable and exhibits no bifurcation or instability as the gain is increased.
关键词： Mode-locked fiber lasers,Ginzburg-Landau equation,Kerr nonlinearity,Self-similar pulses,Numerical methods
更新于2025-09-11 14:15:04
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Bright/dark switchable mode-locked fiber laser based on black phosphorus
摘要： Stable bright/dark switchable mode-locked nanosecond pulse fiber laser incorporating black phosphorus (BP) was demonstrated in the Yb-doped fiber ring cavity for the first time, to the best of our knowledge. The high-quality BP saturable absorber (SA) was fabricated by the modified electrochemical delamination exfoliation process. The states between bright and dark pulse could be switched by simply adjusting the intra-cavity polarization states, and close agreement with the cubic Ginzburg-Landau equation (CGLE) models is present.
关键词： Mode-locked,Bright/dark pulse,Fiber laser,Black phosphorus
更新于2025-09-11 14:15:04
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Femtosecond Soliton Erbium-doped Fiber Laser with a Symmetrical GIMF-SIMF-GIMF Saturable Absorber
摘要： A femtosecond soliton erbium-doped fiber ring laser with the symmetrical saturable absorber (SA) of graded index multimode fiber-step index multimode fiber-graded index multimode fiber (GIMF-SIMF-GIMF) is proposed and proved. Based on the nonlinear multimode interference (NL-MMI) effect of SA, the fiber laser achieved femtosecond soliton mode-locking operation and repetition rate tuning. The duration of soliton was 364 fs at 1562.5 nm and repetition rate was tunable from 10.29 MHz to 763.36 MHz. In the structure of SA, a short step index multimode fiber (SIMF) was inserted between two graded index multimode fibers (GIMFs) to generate more high-order modes，adjust the self-focusing length, and improve operation stability of mode-locked fiber laser. The SA also has the advantages of immunity to the external environment variation, high damage threshold and inoxidizability, which make the laser operate stably for a long time.
关键词： Femtosecond soliton,ultrafast fiber lasers.,mode-locked fiber lasers,nonlinear multimode interference
更新于2025-09-11 14:15:04
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Ultrafast mode-locked fiber laser with Zirconium disulfide on D-shaped Fiber
摘要： Transition-metal dichalcogenides (TMDs), as highly anisotropic layered compounds, have attracted increasing interest from basic research to practical applications. Among them, zirconium disulfide (ZrS2) with remarkable physical properties has been widely investigated recently. Here, ZrS2 employed as a saturable absorber is utilized in an Er-doped fiber laser. A stable mode-locking operation is achieved, with central wavelength of ~1559.5 nm, 3 dB bandwidth of ~1.72 nm, and pulse duration of ~1.75 ps. These results make ZrS2 an appealing candidate for generating ultrafast laser pulses.
关键词： Mode-locked,Laser,Solitons
更新于2025-09-11 14:15:04
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Splitting and Motions of Dissipative Soliton Resonance Pulses in Mode-Locked Fiber Lasers
摘要： We numerically investigated the splitting and motions of dissipative soliton resonance (DSR) pulses in an all-normal-dispersion Yb-doped ?ber laser mode-locked by a non-linear optical loop mirror. At certain values of the system parameters, the initial single Gaussian pulse can evolve into an unstable DSR pulse with several dark solitons inside. After collisions of dark solitons, a big intensity dip occurs at the center of the DSR pulse, leading to the splitting of the DSR pulse. After splitting, the peak-to-peak separation between two DSR pulses increases at ?rst and ?nally reaches a ?xed value of 193 ps, indicating a steady-state multipulse operation The relative motions of separated DSR pulse originate from the phase shift.
关键词： dissipative soliton resonance,pulse splitting,non-linear optics,?ber lasers,mode-locked lasers
更新于2025-09-11 14:15:04