For the first time we have suggested and realized passive Q-switched cladding pumped Er-doped fiber laser with a saturable absorber based on Tm-doped fiber. The pulse duration was of 100 ns, the pulse energy -0.35 mJ, the peak power -3.5 kW while the average power is less than 1 W. The laser is perspective for technology processes and medicine. Key words: fiber laser and amplifier; Q-switching Q-switched fiber lasers due to high pulse energy allow one to increase a number of laser applications including medicine, material processing, range finding etc. Application of all-fiber design simplifies the laser collection and operation. One of the ways to realize all-fiber Q-switched laser consists in an application of the fiber saturable absorber. This approach utilizes an additional fiber having resonance losses at the oscillation wavelength within the laser cavity. Thus, Cr-doped fiber was used as absorber in Nd-doped fiber [1]. In [2,3] it was demonstrated that a placing of Sm-doped fiber in the cavity of Yb-doped fiber laser allows one to get the pulse generation occurring in extremely stable manner with pulse energy of approximately 20 μJ. A Q-switch pulse had a nearly perfect pulse shape with a ∼650 ns full width at half maximum (FWHM). The interesting approach was applied in [4], where Bi-doped fiber played a role of the saturated absorber. Bi-doped fiber was placed in a separate cavity to achieve a laser action at its wavelength and consequently to decrease the lifetime of the active centers in the excited state. That allowed authors to demonstrate the stable pulsed lasing with the pulse energy up to 0.1 mJ and the pulse duration in a range of approximately 1-2 μs. Application of this laser allowed us to demonstrate the pulsed Raman laser [5,6]. In [7,8] Q-switched Yb-doped fiber laser with Ho-fiber laser as the saturable absorber was demonstrated. Pulse energy was estimated as 70 μJ, peak power -as 300 W and pulse duration -250 ns. Thus several schemes for Q-switched Yb-doped fiber lasers were development.At the same time Q-switched Er-doped fiber lasers are of great interest because of their oscillation spectral range
We demonstrate sub-picosecond holmium-doped fiber laser mode-locked with a broadband carbon nanotube saturable absorber. Ultrashort pulse operation has been obtained for the wavelength range of 2030 -2100 nm with output power up to 60 mW and repetition rate of 15.7 MHz.
Three all-fiber Ho-doped lasers emitting in the range of 2050-2100 nm were fabricated. The lasers were pumped by an Yb-doped fiber laser at 1147 nm with a power up to 35 W. For all the lasers tested, the output power was found to be as high as 10 W, the efficiency slope being 30%.
For the first time to our best knowledge we have used Ho-doped fiber amplifier to get supercontinuum in the mid-IR range using all-fiber scheme. To pump the source Q-switched Er-doped fiber was used. The observed spectrum covers the spectral range from 2000 to 2500 nm with the power variation less than two decades. Average power of 0.4 W and pulse energy of 0.1 mJ was measured.
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