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Fang Q.,Tianjin University | Fang Q.,HFB Photonics Co. | Fang Q.,China Institute of Technology | Xu Y.,HFB Photonics Co. | And 4 more authors.
Optics Letters | Year: 2016

We report a single-frequency distributed Bragg reflector (DBR) fiber laser at 930 nm for the first time, to the best of our knowledge. A ∼2.5 cm long commercial highly neodymium-doped silica fiber was utilized as the gain medium to achieve ∼1.9 mW laser output. The single longitudinal mode operation of this laser was verified by a scanning Fabry-Perot interferometer. This fiber laser is suited for seeding high-power 930 nm narrow-linewidth laser amplifiers, which can be used to generate coherent single-frequency pure blue light through frequency doubling. © 2016 Optical Society of America.

Yu Z.,Tianjin Optera Laser Technology Co. | Shi W.,Tianjin University | Dong X.,Tianjin Optera Laser Technology Co. | Li J.,Tianjin Optera Laser Technology Co. | And 2 more authors.
Applied Optics | Year: 2016

We demonstrate an all-fiber picosecond fiber laser in a master oscillator power amplifier configuration. The seed source is a soliton-type passively mode-locked Yb-doped fiber laser by a semiconductor saturable absorber mirror and chirped fiber Bragg grating. The pulse width of the seed laser is 4.5 ps with a repetition rate of 15 MHz. A highly doped active fiber with a large core diameter (50 μm) is employed to boost the average power of the seed pulses to 117 W with 11 ps pulse width and 709 kW peak power. The corresponding output beam quality factor at maximum output power is 3.7. The all-fiber construction of the whole laser system enables compact size and robust operation. © 2016 Optical Society of America.

Shi W.,Tianjin Optera Laser Technology Co. | Shi W.,Tianjin University | Shi W.,China Institute of Technology | Shi W.,Shandong HFB Photonics Co. | And 14 more authors.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2015

We demonstrate a monolithic continuous wave (CW) fiber laser oscillator, producing ~1.63 kW laser power at 1080 nm. In our experiment, the monolithic laser oscillator was pumped by 7 fiber-pigtailed laser diodes with the maximum output power of ~300 W. The operating wavelengths of all these pump laser diodes are near 976 nm, enabling a short laser cavity (~27 m) to effectively suppress the stimulated Raman scattering (SRS). The laser spectrum with the maximum output power has a signal to noise ratio (SNR) more than 40 dB. In addition, the fiber coiling technique was adopted to effectively depress the high-order laser modes to obtain the single mode beam quality (M2<1.1) at the maximum output laser power. The optical to optical conversion efficiency of the monolithic laser oscillator with respect to the launched pump power is as high as ~75.46%. The laser oscillator kept running for an hour at the maximum output power. No power roll-over was observed and power fluctuation lower than 1% was achieved. The all fiber construction of the laser oscillator enables compact size, maintenance-free, robust operation and thus allows various practical applications in industry material processing, such as laser cutting, laser drilling, laser clamping, laser welding, etc. ©, 2015, Board of Optronics Lasers. All right reserved.

Shi W.,Tianjin University | Shi W.,China Institute of Technology | Fang Q.,Shandong HFB Photonics Co. | Fang Q.,Tianjin Optera Laser Technology Co. | And 7 more authors.
2015 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015 | Year: 2016

We report a high power, narrow linewidth, linearly polarized, MOPA based fiber laser at 1064.46 nm with 520W average power, 30 GHz linewidth, 18 dB polarization extinction ratio, 88.7% slope efficiency, and diffraction-limited beam quality. © 2015 IEEE.

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