We demonstrate 1.54 W of laser emission at 905 nm from a fully fiber-based polarization-maintained master oscillator power amplifier (MOPA). The laser system comprises a directly modulated Fabry-Perot laser diode emitting at 905 nm, which is subsequently amplified by a three-stage pre-amplifier and a main amplifier. The system achieved an output energy of 0.15 mJ at a repetition frequency of 10 kHz with a pulse width of 20 ns.
Recently, narrow linewidth fiber lasers are wide applied in coherent detection and wavelength beam combining. In high power narrow linewidth fiber laser, Stimulated Brillouin Scattering (SBS) is the major power limitation factor. Through increasing the frequency number and frequency spacing, SBS threshold power multiplied. In this paper, tow stage white noise phase modulation technology is used to control the frequency number and frequency spacing. Under tow stage white noise phase modulation and three stage fiber amplified technology, the laser linewidth of 13GHz,power of 2.7kW and central wavelength of 1064.4nm, are achieved respectively. And the beam quality is M2x = 1.31 and M2y = 1.3.
Recently, narrow linewidth fiber lasers are wide applied in coherent detection and wavelength beam combining. The influence of fiber grating oscillating longitudinal mode distribution and the amplifier gain fiber characteristics on the output laser spectrum width are explored. The influence of the optical field distribution and the spatial hole burning effect on oscillating longitudinal modes number is analyzed. And the influence of four-wave mixing effect (FWM) in the amplified laser on the spectral width of the output laser is analyzed. The main oscillation power amplification technology of one-stage oscillation and one-stage amplification is used. Finally, the influence of the reflection bandwidth of the resonant cavity, the longitudinal mode number of the main oscillation stage and the length and core diameter of the gain fiber of the amplifier stage on the output laser spectrum width is studied. Spectral width of 0.29nm, power of 2kW and center wavelength of 1064.4nm is realized. The beam quality is Mx2=1.2,My2=1.3.
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