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Nonlinear optical properties of tungsten disulfide as saturable absorber based on Q-switched fiber laser
摘要： In this paper, nonlinear optical properties of tungsten disulfide are studied. Tungsten disulfide (WS2) is prepared as saturable absorber (SA) with the microstructured optical fiber. When the SA based on WS2 is assembled into a fiber laser, Q-switched operation is demonstrated. The 2 nm spectral width is obtained at the central wavelength of 1531 nm. The signal-to-noise ratio is about 80 dB, which indicates that the fiber laser is very stable. The shortest pulse duration is 800 nm at the maximum input power of 650 mW. The conclusion shows that WS2 is a good nonlinear optical material.
关键词： Saturable absorber,Fiber laser,Tungsten disulfide,Nonlinear optical properties
更新于2025-09-11 14:15:04
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MODELLING AND SIMULATION OF P-I-N QUANTUM DOT SEMICONDUCTOR SATURABLE ABSORBER MIRRORS
摘要： Semiconductor saturable absorber mirror (SESAM) based on InAs quantum dot (QD) is important in designing fast mode-locked laser devices. A self-consistent time-domain material travelling-wave (TDTW) model for the simulation of self-assembled QD-SESAM is developed. The 1-D TDTW model takes into consideration the time-varying QD optical susceptibility, refractive index variation resulting from the intersubband free-carrier absorption, homogeneous and inhomogeneous broadening. The carrier concentration rate equations are considered simultaneously with the travelling wave model. The model is used to analyze the characteristics of 1.3-μm p-i-n QD InAs-GaAs SESAM. The ?eld distribution resulting from the TDTW equations, in both the SESAM absorbing region and the distributed Bragg re?ectors, is obtained and used in ?nding the device characteristics including the modulation depth and recovery dynamics. These characteristics are studied considering the e?ects of QD surface density, inhomogeneous broadening, the number of QD absorbing layers, and the applied reverse voltage. The obtained results, based on the assumed device parameters, are in good agreement, qualitatively, with the experimental results.
关键词： Travelling-wave model,Quantum dot,Modulation depth,Semiconductor saturable absorber mirror,Recovery dynamics
更新于2025-09-11 14:15:04
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Alq <sub/>3</sub> saturable absorber for generating Q‐switched pulses in erbium‐doped fiber laser
摘要： Q-switch pulses were successfully produced utilizing an organic saturable absorber (SA) to modulate loss inside an erbium-doped fiber laser (EDFL) cavity. The organic material was tris-(8-hydroxyquinoline) aluminum (Alq3) and it was mixed with polyvinyl alcohol to form a film. The Q-switched EDFL operated at 1564.1 nm and the generated pulses were stable with tunable repetition rates. The repetition rates increased from 45.87 to 68.03 kHz as the pump power was elevated from 42.8 to 84.0 mW. Within this power range, the maximum pulse energy and the shortest pulse width were obtained at 139 nJ and 6.03 μs, respectively. The fundamental frequency of the electrical spectrum has a signal-to-noise ratio of 64 dB and thus verifies the stability of the laser. The results indicate that the proposed Alq3 material is feasible for use as SA in realizing a reliably stable and flexible Q-switch laser for 1.5 μm operation.
关键词： fiber lasers,passive Q-switching,organic saturable absorber,organic material
更新于2025-09-11 14:15:04
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1.34 m Q-switched Nd:YVO4 laser based on perovskite film saturable absorber
摘要： Hybrid organic-inorganic methylammonium lead halide (CH3NH3PbI3) perovskite with a direct band gap has emerged as a material in the development of optoelectronic devices. Here, for the first time, at 1.34 μm, we fabricated CH3NH3PbI3 perovskite film saturable absorbers by spin coating methods laser. The CH3NH3PbI3-SA shows a damage threshold of 276.6 mJ/cm2, a modulation depth of 18.2%, and a considerably low saturation intensity of 140.7 KW/cm2. By using CH3NH3PbI3-SA, a stable Q-switched laser with a maximum average output power of 182 mW and a pulse width of 181.6 ns can be obtained. These results reveal in 1.34 the promising application of CH3NH3PbI3 μm-lasers, optical switches or optical modulators.
关键词： Perovskite,saturable absorber,Q-switched laser
更新于2025-09-11 14:15:04
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Handbook of Graphene || Ultrashort Pulse Fiber Laser Generation Using Molybdenum Disulfide and Tungsten Disulfide Saturable Absorber
摘要： Passive mode-locked erbium-doped fiber lasers (EDFLs) based on the newly developed tungsten disulfide (WS2) and molybdenum disulfide (MoS2) saturable absorber (SA) are experimentally demonstrated. The laser cavity has a total length of 204 m long with a 2.4-m-long erbium-doped fiber (EDF) as a gain medium, and thus it operates in anomalous fiber dispersion of -4.44 ps2. With a WS2 SA, a stable 2.43 ps soliton pulse operating at 1562-nm wavelength with the third harmonic repetition rate of 3.48 MHz is successfully obtained. Mode-locked pulse is realized at threshold pump power of 184 mW with calculated maximum pulse energy as 2.0 nJ at a pump power of 249.6 mW, respectively. Furthermore, the fabricated MoS2 SA can also work steadily at mode-locking state with the pump power range from 105 to 140 mW. The MoS2-based EDFL operates at 1566 nm with the fundamental frequency of 1.16 MHz and pulse width of 468 ns. Compared to WS2-based laser, this laser produces a higher pulse energy of 9.13 nJ. These results show that both WS2 and MoS2 SAs are simple and indicate low-insertion-loss, low-cost, and ultrafast saturable absorption device for ultrafast photonic applications. Various applications may benefit from the ultrafast nonlinear features of these transition-metal dichalcogenide (TMD) materials.
关键词： mode-locking technique,Erbium-doped fiber,saturable absorber
更新于2025-09-11 14:15:04