100 W all fiber picosecond MOPA laser

College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Optics Express (Impact Factor: 3.49). 12/2009; 17(26):24008-12. DOI: 10.1364/OE.17.024008
Source: PubMed

ABSTRACT A high power picosecond laser is constructed in an all fiber master oscillator power amplifier (MOPA) configuration. The seed source is an ytterbium-doped single mode fiber laser passively mode-locked by a semiconductor saturable absorber mirror (SESAM). It produces 20 mW average power with 13 ps pulse width and 59.8 MHz repetition rate. A direct amplification of this seed source encounters obvious nonlinear effects hence serious spectral broadening at only ten watt power level. To avoid these nonlinear effects, we octupled the repetition rate to about 478 MHz though a self-made all fiber device before amplification. The ultimate output laser exhibits an average power of 96 W, a pulse width of 16 ps, a beam quality M2 of less than 1.5, and an optical conversion efficiency of 61.5%.

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    ABSTRACT: Single-frequency linearly-polarized 1083 nm all fiber nanosecond master-oscillator power amplifier laser system is demonstrated. A ring laser, whose key components are one saturable absorber and two polarization controllers, delivers a single-frequency continuous wave laser. Using an electro-optic modulator as the modulator, the pulse laser seed is obtained by modulating the CW laser. By amplifying the pulse seed to the average power of 61.6 W in three stages, a single-frequency linearly-polarized laser with pulse duration of 16 ns, repetition rate of 10 MHz and pulse energy of 6.16 μJ is obtained. No nonlinear effect is observed in our experiment. Higher output power can be obtained by increasing LDs of the main amplifier.
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    ABSTRACT: we report an all-fiber picoseconds MOPA laser with a narrow spectrum output in this paper. The repetition rate of the seed source is increased to ∼1 GHz with a unique all-fiber device to suppress nonlinear effects, and a small core gain fiber is used in the power amplifier to support the less transverse mode. Three cascaded amplifiers are adopted to amplify the signal light, and the maximum output power is 30 W with an optical conversion efficiency of 73.9%. The 6 dB spectral linewidth just extends from 0.89 nm of the seed to 1.34 nm at the max output.
    Laser Physics 09/2012; 22(9). DOI:10.1134/S1054660X1209006X · 1.03 Impact Factor
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