Letters|5 Article(s)
Femtosecond fiber laser at 780 nm for two-photon autofluorescence imaging
Wan Yang, Danlei Wu, Runlong Wu, Guanyu Liu, Bingying Chen, Lishuang Feng, Zhigang Zhang, and Aimin Wang
Chinese Optics Letters
  • Publication Date: Jul. 10, 2019
  • Vol. 17, Issue 7, 071405 (2019)
Soliton mode-locked fiber laser with high-quality MBE-grown Bi2Se3 film
Runlin Miao, Mingyu Tong, Ke Yin, Hao Ouyang, Zhenyu Wang, Xin Zheng, Xiang’ai Cheng, and Tian Jiang
In this work, a soliton mode-locked erbium-doped fiber laser (EDFL) with a high-quality molecular beam epitaxy (MBE)-grown topological insulator (TI) Bi2Se3 saturable absorber (SA) is reported. To fabricate the SA device, a 16-layer Bi2Se3 film was grown successfully on a 100 μm thick SiO2 substrate and sandwiched directly between two fiber ferrules. The TI-SA had a saturable absorption of 1.12% and a saturable influence of 160 MW/cm2. After inserting the TI-SA into the unidirectional ring-cavity EDFL, self-starting mode-locked soliton pulse trains were obtained at a fundamental repetition rate of 19.352 MHz. The output central wavelength, pulse energy, pulse duration, and signal to noise ratio of the radio frequency spectrum were 1530 nm,18.5 pJ, 1.08 ps, and 60 dBm, respectively. These results demonstrate that the MBE technique could provide a controllable and repeatable method for the fabrication of identical high-quality TI-SAs, which is critically important for ultra-fast pulse generation.
Chinese Optics Letters
  • Publication Date: Jul. 10, 2019
  • Vol. 17, Issue 7, 071403 (2019)
272  W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber
Meng Wang, Fan Wang, Suya Feng, Chunlei Yu, Shikai Wang, Qinling Zhou, Lei Zhang, Fengguang Lou, Danping Chen, and Lili Hu
A large-mode-area (LMA) ytterbium-doped photonic crystal fiber (PCF) with core NA of 0.034 and core diameter of 50 μm was made by the stack-and-draw technique. The core is formed by Yb3+/Al3+/F /P5+ co-doped silica glass containing 0.09 mol% Yb2O3 with an absorption coefficient at 976 nm up to 3.2 dB/m. The core glass with homogeneous distribution of Yb3+ ions and refractive index difference of 4 × 10 4 compared with pure silica was prepared by the sol-gel method and heat homogenization at 2000°C. Laser power amplification of this LMA PCF was studied using a seed source of 21 ps pulse duration and 48.7 MHz repetition rate at 1030 nm wavelength. With pump power of 520 W, a maximum 272 W (266 kW peak power) quasi-single-mode laser output with M2 of 2.2 was achieved in a 4.7 m fiber length bent at a diameter of 47 cm with slope efficiency of 52%, and no obvious mode instability, stimulated Raman scattering, or thermal damage on the end facet of the fiber were observed.
Chinese Optics Letters
  • Publication Date: Jul. 10, 2019
  • Vol. 17, Issue 7, 071401 (2019)
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