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


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%.

24 Reads
  • [Show abstract] [Hide abstract]
    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
  • [Show abstract] [Hide abstract]
    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.
    Applied Physics B 12/2012; 109(4). DOI:10.1007/s00340-012-5227-y · 1.86 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A passive mode-locked fiber laser-delivered 13 ps pulse is saturatedly amplified with a four-stage amplifier chain. 125 W high power all-fiber picoseconds pulse laser is demonstrated in a 15-μm fiber core, and the optical-to-optical conversion efficiency of the main amplifier is up to 86.12 %. A home-made (6 + 1) × 1 fiber combiner is used to couple the pump light and signal light into the gain double cladding fiber. In order to suppress the nonlinear effects in high-power picosecond fiber amplifiers, the repetition rate of the seed pulse is increased from 60 MHz to ~1 GHz; also the gain fibers are advisably selected. The amplified output spectrum is symmetrically broadened to several nanometers due to self-phase modulation (SPM). No stimulated Raman scattering (SRS), amplified spontaneous emission (ASE) and residual pump light are observed and the optical signal-to-noise ratio is more than 30 dB. The all-fiber picoseconds MOPA laser in this report can be easily performed with the conventional fiber handing equipments, and it has great potential to be applied as pump source in the fields of optical parametric oscillator, laser frequency-doubling and supercontinuum generation.
    Applied Physics B 11/2012; 109(2). DOI:10.1007/s00340-012-5119-1 · 1.86 Impact Factor
Show more


24 Reads
Available from