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Niobium disulfide as a new saturable absorber for an ultrafast fiber laser
摘要： Group VB transition metal dichalcogenides (TMDCs) are emerging two-dimensional materials and have attracted significant interests in the fields of physics, chemistry, and material sciences. However, there are very few reports about the optical characteristics and ultrafast photonic applications based on group VB TMDCs so far. In this work, we have calculated the niobium disulfide (NbS2) band structure by the density functional theory (DFT), which has revealed that NbS2 is a metallic TMDC. In addition, we have prepared an NbS2-microfiber device and the nonlinear optical characteristics have been investigated. The modulation depth, saturation intensity and non-saturable loss have been measured to be 13.7%, 59.93 MW cm?2 and 17.74%, respectively. Based on the nonlinear optical modulation effect, the Er-doped fiber (EDF) laser works in the soliton mode-locking state with the pump power of 94–413 mW. The pulse duration of 709 fs and the maximum average output power of 23.34 mW have been obtained at the pump power of 413 mW. The slope efficiency is as high as 6.79%. Compared to the recently reported studies based on TMDCs comprehensively, our experimental results are better. These experimental results demonstrate that NbS2 with excellent nonlinear optical properties can be used as a promising candidate to advance the development of ultrafast photonics.
关键词： Niobium disulfide,ultrafast fiber laser,saturable absorber,mode-locking,nonlinear optical properties
更新于2025-09-19 17:13:59
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NiPS <sub/>3</sub> nanosheets for passive pulse generation in an Er-doped fiber laser
摘要： With the rapidly increasing demands of industrial material processing, biomedical sensing, light detection, and high-speed communication, various novel two-dimensional (2D) materials have been synthesized and employed in ultrafast fiber laser generation due to their advantages of easy processing characteristics, desirable structures and excellent nonlinear optical properties. However, finding an efficient 2D material-based saturable absorber (SA) with the capacity of both high stability and excellent working property performance remains a challenge. Herein, high-quality NiPS3 crystals, from the metal phosphorus trichalcogenide (MPT3) family, were synthesized by a modified chemical vapor transport (CVT) method and a few-layer NiPS3 nanosheet SA was easily obtained using a direct liquid-phase exfoliation method. Different from other 2D materials, ultrathin NiPS3 nanosheets display a good stability. Moreover, a passively Q-switched operation and dual-wavelength mode-locked pulse output were proposed based on a NiPS3-SA erbium-doped fiber (EDF) laser. In the passively Q-switched operation, the maximum peak power was 6.40 mW with a maximum pulse energy of 29.66 nJ. It is also worth noting that dual-wavelength pulse output was achieved in passively mode-locked pulse generation. These results not only supply other choices of SAs for pulse generation, but also provide guidance to extend other possible applications of the MPT3 family for nonlinear optics.
关键词： mode-locked,Q-switched,NiPS3 nanosheets,ultrafast fiber laser,saturable absorber
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) - Intra-Cavity Mode-Selective Coupler Assisted Ultrafast Cylindrical Vector Fiber Laser
摘要： Cylindrical vector beam (CVB) fiber lasers have attracted great attentions due to their promising applications in optical communications, super-resolution imaging and optical trapping. Recently, it has been proved that mode-selective coupler (MSC) is an efficient method for generating CVBs in all-fiber lasers [1-3]. However, to date, the reported MSC-assisted CVB lasers have a common feature that the fundamental transverse mode (LP01) oscillates in the laser cavity whereas the high-order modes are outside the laser cavity. To some extent, such cylindrical vector lasers belong to the external mode conversion, rather than the direct generation of high-order modes inside the laser cavity. In this contribution, we present an intra-cavity MSC assisted CVB fiber laser in a compact linear-cavity mode-locked by using a semiconductor saturable absorber mirror (SESAM). The laser architecture is shown in Fig. 1(a), which consists of a 5 m Er-doped fiber, a 980/1550 wavelength-division multiplexer (WDM) pumped by a 980 nm laser, a polarization controller (PC), a 90% high coupling ratio MSC with an insertion loss of 0.3 dB. A fiber end-facet mirror is sandwiched between the two fiber ferrules and a SESAM mode locker has a modulation depth of 18%. The rest of cavity consists of ~14.3 m standard single-mode fiber (SMF) and ~0.6 m few mode fiber (FMF). Self-started mode-locking occurs when the pump power reaches ~35 mW. Thanks to the high coupling efficiency of intra-cavity mode converter, LP01 mode in the SMF is sufficiently coupled to LP11 mode in the FMF when it passes through the MSC. The reflected LP11 mode from the mirror can be partially coupled back to the SMF with a low loss, resulting in the laser oscillation. In this case, the laser operates between MSC and the mirror in the LP11 mode, which outputs from the FMF, meanwhile the LP01 mode oscillates in the remaining section of the linear-cavity. Eventually, the laser can allow the direct generation of LP11 mode from the laser cavity. Typical laser output characteristics such as broadband spectra, pulse train and output power are shown in Fig. 1(b)-(e). The laser operates at the wavelength of 1562 nm with a 3-dB bandwidth of ~4.4 nm and a repetition rate of 5.2 MHz. Radially polarized and azimuthally polarized ultrafast CVBs are obtained by adjusting the PC, and corresponding donut beam profiles are demonstrated by checking the rotating intensity distribution through the linear polarizer, as presented in Fig. 1(f).
关键词： Cylindrical vector beam,mode-selective coupler,ultrafast,fiber laser
更新于2025-09-11 14:15:04