TiS2-based saturable absorber for ultrafast fiber lasers
We fabricate titanium disulfide (TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. With the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and Q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.
基金项目：Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC)10.13039/501100001809 (51778030, 61505005, 61505112).
S. Chen：Department of Optoelectronics Engineering, Shenzhen University, Shenzhen 518060, China
M. Zhang：School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
L. Chen：Department of Optoelectronics Engineering, Shenzhen University, Shenzhen 518060, ChinaCollege of Health Science and Environmental Engineering, Shenzhen Technology University, Shenzhen 518118, Chinae-mail: email@example.com
Q. Wu：School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
J. Zhao：College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
Q. Jiang：School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
Z. Zheng：School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
H. Zhang：Department of Optoelectronics Engineering, Shenzhen University, Shenzhen 518060, China
【1】R. I. Woodward, and E. J. R. Kelleher, “2D saturable absorbers for fibre lasers,” Appl. Sci. 5 , 1440–1456 (2015).
【2】M. I. Dzhibladze, Z. G. Esiashvili, E. S. Teplitskii, S. K. Isaev, and V. R. Sagaradze, “Mode locking in a fiber laser,” Sov. J. Quantum Electron. 13 , 245–247 (1983).
【3】U. Keller, “Recent developments in compact ultrafast lasers,” Nature 424 , 831–838 (2003).
【4】T. Skaltsas, S. Pispas, and N. Tagmatarchis, “Photoinduced charge-transfer interactions on a graphene/block copolymer electrostatically bound to tetracationic porphyrin in aqueous media,” Chem. Eur. J. 19 , 9286–9290 (2013).
【5】M. Zhang, E. J. R. Kelleher, F. Torrisi, Z. Sun, T. Hasan, D. Popa, F. Wang, A. C. Ferrari, S. V. Popov, and J. R. Taylor, “Tm-doped fiber laser mode-locked by graphene-polymer composite,” Opt. Express 20 , 25077–25084 (2012).
【6】M. Zhang, R. C. T. Howe, R. I. Woodward, E. J. R. Kelleher, F. Torrisi, G. Hu, S. V. Popov, J. R. Taylor, and T. Hasan, “Solution processed MoS2-PVA composite for sub-bandgap mode-locking of a wideband tunable ultrafast Er:fiber laser,” Nano Res. 8 , 1522–1534 (2015).
【7】C. Liao, K. Fan, R. Xu, H. Zhang, C. Lu, Y. Cui, and J. Zhang, “Laser-annealing-made amplified spontaneous emission of ‘giant’ CdSe/CdS core/shell nanocrystals transferred from bulk-like shell to quantum-confined core,” Photon. Res. 3 , 200–205 (2015).
【8】D. Mao, Y. Wang, C. Ma, B. Jiang, X. Gan, S. Hua, W. Zhang, T. Mei, and J. Zhao, “WS2 mode-locked ultrafast fiber laser,” Sci. Rep. 5 , 7965 (2015).
【9】Z. Luo, D. Wu, B. Xu, H. Xu, Z. Cai, J. Peng, J. Weng, S. Xu, C. Zhu, F. Wang, Z. Sun, and H. Zhang, “Two-dimensional material-based saturable absorbers: towards compact visible-wavelength all-fiber pulsed lasers,” Nanoscale 8 , 1066–1072 (2016).
【10】G. Hu, T. Albrow-Owen, X. Jin, A. Ali, Y. Hu, R. C. T. Howe, K. Shehzad, Z. Yang, X. Zhu, R. I. Woodward, T.-C. Wu, H. Jussila, J.-B. Wu, P. Peng, P.-H. Tan, Z. Sun, E. J. R. Kelleher, M. Zhang, Y. Xu, and T. Hasan, “Black phosphorus ink formulation for inkjet printing of optoelectronics and photonics,” Nat. Commun. 8 , 278 (2017).
【11】J. Du, M. Zhang, Z. Guo, J. Chen, X. Zhu, G. Hu, P. Peng, Z. Zheng, and H. Zhang, “Phosphorene quantum dot saturable absorbers for ultrafast fiber lasers,” Sci. Rep. 7 , 42357 (2017).
【12】Y. Xu, X.-F. Jiang, Y. Ge, Z. Guo, Z. Zeng, Q.-H. Xu, H. Zhang, X.-F. Yu, and D. Fan, “Size-dependent nonlinear optical properties of black phosphorus nanosheets and their applications in ultrafast photonics,” J. Mater. Chem. C 5 , 3007–3013 (2017).
【13】J. Li, H. Luo, B. Zhai, R. Lu, Z. Guo, H. Zhang, and Y. Liu, “Black phosphorus: a two-dimension saturable absorption material for mid-infrared Q-switched and mode-locked fiber lasers,” Sci. Rep. 6 , 30361 (2016).
【14】M. Zhang, G. Hu, G. Hu, R. C. T. Howe, L. Chen, Z. Zheng, and T. Hasan, “Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber,” Sci. Rep. 5 , 17482 (2015).
【15】M. Barawi, E. Flores, M. Ponthieu, J. Ramón Ares, F. Cuevas, F. Leardini, I. Ferrer, and C. Sanchez, “Hydrogen storage by titanium based sulfides: nanoribbons (TiS3) and nanoplates (TiS2),” J. Electr. Eng. 3 , 24–29 (2015).
【16】K. Dolui, and S. Sanvito, “Dimensionality-driven phonon softening and incipient charge density wave instability in TiS2,” Europhys. Lett. 115 , 47001 (2016).
【17】S. Lin, Y. Chui, Y. Li, and S. P. Lau, “Liquid-phase exfoliation of black phosphorus and its applications,” FlatChem 2 , 15–37 (2017).
【18】Z. Guo, H. Zhang, S. Lu, Z. Wang, S. Tang, J. Shao, Z. Sun, H. Xie, H. Wang, X.-F. Yu, and P. K. Chu, “From black phosphorus to phosphorene: basic solvent exfoliation, evolution of Raman scattering, and applications to ultrafast photonics,” Adv. Funct. Mater. 25 , 6996–7002 (2015).
【19】Sandoval, S. Jiménez, X. K. Chen, and J. C. Irwin, “Raman spectra of Agx TiS2, and lattice dynamics of TiS2,” Phys. Rev. B 45 , 14347–14353 (1992).
【20】M. Scharli, and F. Lévy, “Interlayer acoustic phonons in the layered compound TiS2,” Phys. Rev. B 33 , 4317–4319 (1986).
【21】Z. Wang, L. Zhan, J. Wu, Z. Zou, L. Zhang, K. Qian, L. He, and X. Fang, “Self-starting ultrafast fiber lasers mode-locked with alcohol,” Opt. Lett. 40 , 3699–3702 (2015).
【22】E. Garmire, “Resonant optical nonlinearities in semiconductors,” IEEE J. Sel. Top. Quantum Electron. 6 , 1094–1110 (2000).
【23】D. U. Noske, N. Pandit, and J. R. Taylor, “Source of spectral and temporal instability in soliton fiber lasers,” Opt. Lett. 17 , 1515–1517 (1992).
【24】H. Zhang, D. Y. Tang, L. M. Zhao, and N. Xiang, “Coherent energy exchange between components of a vector soliton in fiber lasers,” Opt. Express 16 , 12618–12623 (2008).
【25】D. Y. Tang, H. Zhang, L. M. Zhao, and X. Wu, “Observation of high-order polarization-locked vector solitons in a fiber laser,” Phys. Rev. Lett. 101 , 153904 (2008).
【26】R. I. Woodward, R. C. T. Howe, T. H. Runcorn, G. Hu, F. Torrisi, E. J. R. Kelleher, and T. Hasan, “Wideband saturable absorption in few-layer molybdenum diselenide (MoSe2) for Q-switching Yb-, Er- and Tm-doped fiber lasers,” Opt. Express 23 , 20051–20061 (2015).
【27】Y. Z. Huang, Z. Q. Luo, Y. Y. Li, M. Zhong, B. Xu, K. J. Che, H. Y. Xu, Z. P. Cai, J. Peng, and J. Weng, “Widely-tunable, passively Q-switched erbium-doped fiber laser with few-layer MoS2 saturable absorber,” Opt. Express 22 , 25258–25266 (2014).
【28】P. G. Ge, J. Liu, S. Z. Jiang, Y. Y. Xu, and B. Y. Man, “Compact Q-switched 2?μm Tm:GdVO4 laser with MoS2 absorber,” Photon. Res. 3 , 256–259 (2015).
【29】Z. Q. Luo, Y. Z. Huang, M. Zhong, Y. Y. Li, J. Y. Wu, B. Xu, H. Y. Xu, Z. P. Cai, J. Peng, and J. Weng, “1-, 1.5-, and 2-μm fiber lasers Q-switched by a broadband few-layer MoS2 saturable absorber,” J. Lightwave Technol. 32 , 4679–4686 (2014).
X. Zhu, S. Chen, M. Zhang, L. Chen, Q. Wu, J. Zhao, Q. Jiang, Z. Zheng, and H. Zhang, "TiS2-based saturable absorber for ultrafast fiber lasers," Photonics Research 6(10), C44 (2018)