In this paper, a novel all-fiber Q-switched single mode Er/Yb co-doped double clad fiber ring laser operating in 1548.11nm is reported, which exploits fiber Bragg grating Sagnac loop mirror as a wavelength-selective device. To obtain higher output power, the laser is pumped by six CW laser diodes operating at 976nm through six pigtails of a Tapered Fiber Bundle connected with the EYDF. When the pump power is 718.9mW, stable self Q-switched pulse series with pulse width of 2.8μs, repetition rate of 50kHz and peak power of 274.3mW are achieved. Self mode-locked pulse is also obtained in such experimental setup.
A study on a tunable fiber laser was reported in this paper. Pumping a twenty-meter-long double-clad Yb3+-doped fiber by a high-power multimode LD system, we obtained a tuning range of 42nm in Littrow configuration, with line widths less than 0.08nm. The temporal characteristics of the fiber laser were studied. Some discussions were also presented for the optimization of high-power tunable fiber lasers.
A compact Q-switched diode-pumped double-clad Yb3+-doped fiber laser was described. By using conventional Q-switching technique and exploiting nonlinearity in the core of the gain fiber, the laser operated at a repetition rate of 1.5kHz with an peak power over 13.3kW, pulse width of 5.2ns and pulse energy of 80 µ J. The output wavelength was tunable from 1080nm to 1119nm with a line width less than 0.2nm.
In this paper, the fiber laser with D-shaped inner cladding fiber is presented. The fiber laser has a second mirror which configuration is called two-mirror cavity to provide different feedback and to stabilize the output. The dynamics with different feedback 4%, 40%, 70% and 90%etc. are studied. In experiment, it obtained 2.32W output with 4% Fresnel reflection of the fiber. With different feedbacks it founds three thresholds, Pth is the laser threshold, pthB is for SBS (stimulated Brillouin scattering) in the fiber laser, and is for SRS (stimulated Raman scattering). The higher feedback level is, the lower threshold is. Also the PthB dynamics appear different characters with the increase of pump power. Under certain condition, the output is stable ns pulses. The pulses width has relationship with the feedback from the second mirror. The phenomena are analyzed quantitatively.
The output characteristics of linear cavity Yb-doped double-clad fiber laser have been studied theoretically and experimentally. Analytical expressions are evaluated for threshold pump power, output power and slope efficiency of the laser under steady state conditions. The expression of minimum of fiber length for designing a linear cavity Yb-doped double-cladding fiber laser has been given. Then, the Yb-doped double-clad fiber laser has been investigated experimentally. By exploiting various output coupler, output power, threshold pump power and the slop efficiency have been measured. Comparison between the experimental results and theoretical data has been performed. They are in good agreement with each other.
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