title: High-quality and Large-size Topological Insulator Bi2Te3-Gold Saturable Absorber Mirror for Mode-Locking Fiber Laser.
abstract: A novel high-quality, large-size, reflection-type topological insulator Bi2Te3-Gold (BG) film-based nonlinear optical modulator has been successfully fabricated as a two-dimensional saturable absorber mirror (SAM) by pulsed laser deposition (PLD). This BG-SAM possesses saturation fluence of 108.3 μJ/cm2, modulation depth (ΔR) of 6.5%, non-saturable loss of 38.4%, high damage threshold above 1.354 mJ/cm2and excellent uniformity providing for the generation of passive mode-locked (ML) pulses for erbium-doped fiber lasers (EDFLs) on a large sample area. Under 124 mW 976 nm pumping, We obtained 452-fs continuous-wave ML pulses with pulse energy of 91 pJ and full width at half-maximum (FWHM) of 6.72-nm from this EDFL. The results clearly evidence that the PLD is an efficient method for fabricating BG-SAM that is suitable for a compact ultrafast ML fiber laser system.
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd., Hsinchu, 30010, Taiwan.
authors.forename: Hou-Ren
authors.initials: HR
authors.lastname: Chen
authors.affiliation: Research Center for Applied Sciences, Academic Sinica, Taipei 11529, Taiwan.
authors.forename: Chih-Ya
authors.initials: CY
authors.lastname: Tsai
authors.affiliation: Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan.
authors.forename: Hsin-Ming
authors.initials: HM
authors.lastname: Cheng
authors.affiliation: Department of Applied Physics and Chemistry, University of Taipei, 1, Ai-Guo West Rd., Taipei, 100, Taiwan.
authors.forename: Kuei-Huei
authors.initials: KH
authors.lastname: Lin
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd., Hsinchu, 30010, Taiwan.
authors.forename: Po-Hsiu
authors.initials: PH
authors.lastname: Yen
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd., Hsinchu, 30010, Taiwan.
authors.forename: Chyong-Hua
authors.initials: CH
authors.lastname: Chen
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001, Ta-Hsueh Rd., Hsinchu, 30010, Taiwan.
authors.forename: Wen-Feng
authors.initials: WF
authors.lastname: Hsieh